diff options
Diffstat (limited to 'src/cmd/compile/internal/test/testdata/arith_test.go')
| -rw-r--r-- | src/cmd/compile/internal/test/testdata/arith_test.go | 1454 |
1 files changed, 1454 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/test/testdata/arith_test.go b/src/cmd/compile/internal/test/testdata/arith_test.go new file mode 100644 index 0000000000..158fedc28e --- /dev/null +++ b/src/cmd/compile/internal/test/testdata/arith_test.go @@ -0,0 +1,1454 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Tests arithmetic expressions + +package main + +import ( + "math" + "runtime" + "testing" +) + +const ( + y = 0x0fffFFFF +) + +var ( + g8 int8 + g16 int16 + g32 int32 + g64 int64 +) + +//go:noinline +func lshNop1(x uint64) uint64 { + // two outer shifts should be removed + return (((x << 5) >> 2) << 2) +} + +//go:noinline +func lshNop2(x uint64) uint64 { + return (((x << 5) >> 2) << 3) +} + +//go:noinline +func lshNop3(x uint64) uint64 { + return (((x << 5) >> 2) << 6) +} + +//go:noinline +func lshNotNop(x uint64) uint64 { + // outer shift can't be removed + return (((x << 5) >> 2) << 1) +} + +//go:noinline +func rshNop1(x uint64) uint64 { + return (((x >> 5) << 2) >> 2) +} + +//go:noinline +func rshNop2(x uint64) uint64 { + return (((x >> 5) << 2) >> 3) +} + +//go:noinline +func rshNop3(x uint64) uint64 { + return (((x >> 5) << 2) >> 6) +} + +//go:noinline +func rshNotNop(x uint64) uint64 { + return (((x >> 5) << 2) >> 1) +} + +func testShiftRemoval(t *testing.T) { + allSet := ^uint64(0) + if want, got := uint64(0x7ffffffffffffff), rshNop1(allSet); want != got { + t.Errorf("testShiftRemoval rshNop1 failed, wanted %d got %d", want, got) + } + if want, got := uint64(0x3ffffffffffffff), rshNop2(allSet); want != got { + t.Errorf("testShiftRemoval rshNop2 failed, wanted %d got %d", want, got) + } + if want, got := uint64(0x7fffffffffffff), rshNop3(allSet); want != got { + t.Errorf("testShiftRemoval rshNop3 failed, wanted %d got %d", want, got) + } + if want, got := uint64(0xffffffffffffffe), rshNotNop(allSet); want != got { + t.Errorf("testShiftRemoval rshNotNop failed, wanted %d got %d", want, got) + } + if want, got := uint64(0xffffffffffffffe0), lshNop1(allSet); want != got { + t.Errorf("testShiftRemoval lshNop1 failed, wanted %d got %d", want, got) + } + if want, got := uint64(0xffffffffffffffc0), lshNop2(allSet); want != got { + t.Errorf("testShiftRemoval lshNop2 failed, wanted %d got %d", want, got) + } + if want, got := uint64(0xfffffffffffffe00), lshNop3(allSet); want != got { + t.Errorf("testShiftRemoval lshNop3 failed, wanted %d got %d", want, got) + } + if want, got := uint64(0x7ffffffffffffff0), lshNotNop(allSet); want != got { + t.Errorf("testShiftRemoval lshNotNop failed, wanted %d got %d", want, got) + } +} + +//go:noinline +func parseLE64(b []byte) uint64 { + // skip the first two bytes, and parse the remaining 8 as a uint64 + return uint64(b[2]) | uint64(b[3])<<8 | uint64(b[4])<<16 | uint64(b[5])<<24 | + uint64(b[6])<<32 | uint64(b[7])<<40 | uint64(b[8])<<48 | uint64(b[9])<<56 +} + +//go:noinline +func parseLE32(b []byte) uint32 { + return uint32(b[2]) | uint32(b[3])<<8 | uint32(b[4])<<16 | uint32(b[5])<<24 +} + +//go:noinline +func parseLE16(b []byte) uint16 { + return uint16(b[2]) | uint16(b[3])<<8 +} + +// testLoadCombine tests for issue #14694 where load combining didn't respect the pointer offset. +func testLoadCombine(t *testing.T) { + testData := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09} + if want, got := uint64(0x0908070605040302), parseLE64(testData); want != got { + t.Errorf("testLoadCombine failed, wanted %d got %d", want, got) + } + if want, got := uint32(0x05040302), parseLE32(testData); want != got { + t.Errorf("testLoadCombine failed, wanted %d got %d", want, got) + } + if want, got := uint16(0x0302), parseLE16(testData); want != got { + t.Errorf("testLoadCombine failed, wanted %d got %d", want, got) + } +} + +var loadSymData = [...]byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08} + +func testLoadSymCombine(t *testing.T) { + w2 := uint16(0x0201) + g2 := uint16(loadSymData[0]) | uint16(loadSymData[1])<<8 + if g2 != w2 { + t.Errorf("testLoadSymCombine failed, wanted %d got %d", w2, g2) + } + w4 := uint32(0x04030201) + g4 := uint32(loadSymData[0]) | uint32(loadSymData[1])<<8 | + uint32(loadSymData[2])<<16 | uint32(loadSymData[3])<<24 + if g4 != w4 { + t.Errorf("testLoadSymCombine failed, wanted %d got %d", w4, g4) + } + w8 := uint64(0x0807060504030201) + g8 := uint64(loadSymData[0]) | uint64(loadSymData[1])<<8 | + uint64(loadSymData[2])<<16 | uint64(loadSymData[3])<<24 | + uint64(loadSymData[4])<<32 | uint64(loadSymData[5])<<40 | + uint64(loadSymData[6])<<48 | uint64(loadSymData[7])<<56 + if g8 != w8 { + t.Errorf("testLoadSymCombine failed, wanted %d got %d", w8, g8) + } +} + +//go:noinline +func invalidAdd_ssa(x uint32) uint32 { + return x + y + y + y + y + y + y + y + y + y + y + y + y + y + y + y + y + y +} + +//go:noinline +func invalidSub_ssa(x uint32) uint32 { + return x - y - y - y - y - y - y - y - y - y - y - y - y - y - y - y - y - y +} + +//go:noinline +func invalidMul_ssa(x uint32) uint32 { + return x * y * y * y * y * y * y * y * y * y * y * y * y * y * y * y * y * y +} + +// testLargeConst tests a situation where larger than 32 bit consts were passed to ADDL +// causing an invalid instruction error. +func testLargeConst(t *testing.T) { + if want, got := uint32(268435440), invalidAdd_ssa(1); want != got { + t.Errorf("testLargeConst add failed, wanted %d got %d", want, got) + } + if want, got := uint32(4026531858), invalidSub_ssa(1); want != got { + t.Errorf("testLargeConst sub failed, wanted %d got %d", want, got) + } + if want, got := uint32(268435455), invalidMul_ssa(1); want != got { + t.Errorf("testLargeConst mul failed, wanted %d got %d", want, got) + } +} + +// testArithRshConst ensures that "const >> const" right shifts correctly perform +// sign extension on the lhs constant +func testArithRshConst(t *testing.T) { + wantu := uint64(0x4000000000000000) + if got := arithRshuConst_ssa(); got != wantu { + t.Errorf("arithRshuConst failed, wanted %d got %d", wantu, got) + } + + wants := int64(-0x4000000000000000) + if got := arithRshConst_ssa(); got != wants { + t.Errorf("arithRshConst failed, wanted %d got %d", wants, got) + } +} + +//go:noinline +func arithRshuConst_ssa() uint64 { + y := uint64(0x8000000000000001) + z := uint64(1) + return uint64(y >> z) +} + +//go:noinline +func arithRshConst_ssa() int64 { + y := int64(-0x8000000000000000) + z := uint64(1) + return int64(y >> z) +} + +//go:noinline +func arithConstShift_ssa(x int64) int64 { + return x >> 100 +} + +// testArithConstShift tests that right shift by large constants preserve +// the sign of the input. +func testArithConstShift(t *testing.T) { + want := int64(-1) + if got := arithConstShift_ssa(-1); want != got { + t.Errorf("arithConstShift_ssa(-1) failed, wanted %d got %d", want, got) + } + want = 0 + if got := arithConstShift_ssa(1); want != got { + t.Errorf("arithConstShift_ssa(1) failed, wanted %d got %d", want, got) + } +} + +// overflowConstShift_ssa verifes that constant folding for shift +// doesn't wrap (i.e. x << MAX_INT << 1 doesn't get folded to x << 0). +//go:noinline +func overflowConstShift64_ssa(x int64) int64 { + return x << uint64(0xffffffffffffffff) << uint64(1) +} + +//go:noinline +func overflowConstShift32_ssa(x int64) int32 { + return int32(x) << uint32(0xffffffff) << uint32(1) +} + +//go:noinline +func overflowConstShift16_ssa(x int64) int16 { + return int16(x) << uint16(0xffff) << uint16(1) +} + +//go:noinline +func overflowConstShift8_ssa(x int64) int8 { + return int8(x) << uint8(0xff) << uint8(1) +} + +func testOverflowConstShift(t *testing.T) { + want := int64(0) + for x := int64(-127); x < int64(127); x++ { + got := overflowConstShift64_ssa(x) + if want != got { + t.Errorf("overflowShift64 failed, wanted %d got %d", want, got) + } + got = int64(overflowConstShift32_ssa(x)) + if want != got { + t.Errorf("overflowShift32 failed, wanted %d got %d", want, got) + } + got = int64(overflowConstShift16_ssa(x)) + if want != got { + t.Errorf("overflowShift16 failed, wanted %d got %d", want, got) + } + got = int64(overflowConstShift8_ssa(x)) + if want != got { + t.Errorf("overflowShift8 failed, wanted %d got %d", want, got) + } + } +} + +// test64BitConstMult tests that rewrite rules don't fold 64 bit constants +// into multiply instructions. +func test64BitConstMult(t *testing.T) { + want := int64(103079215109) + if got := test64BitConstMult_ssa(1, 2); want != got { + t.Errorf("test64BitConstMult failed, wanted %d got %d", want, got) + } +} + +//go:noinline +func test64BitConstMult_ssa(a, b int64) int64 { + return 34359738369*a + b*34359738370 +} + +// test64BitConstAdd tests that rewrite rules don't fold 64 bit constants +// into add instructions. +func test64BitConstAdd(t *testing.T) { + want := int64(3567671782835376650) + if got := test64BitConstAdd_ssa(1, 2); want != got { + t.Errorf("test64BitConstAdd failed, wanted %d got %d", want, got) + } +} + +//go:noinline +func test64BitConstAdd_ssa(a, b int64) int64 { + return a + 575815584948629622 + b + 2991856197886747025 +} + +// testRegallocCVSpill tests that regalloc spills a value whose last use is the +// current value. +func testRegallocCVSpill(t *testing.T) { + want := int8(-9) + if got := testRegallocCVSpill_ssa(1, 2, 3, 4); want != got { + t.Errorf("testRegallocCVSpill failed, wanted %d got %d", want, got) + } +} + +//go:noinline +func testRegallocCVSpill_ssa(a, b, c, d int8) int8 { + return a + -32 + b + 63*c*-87*d +} + +func testBitwiseLogic(t *testing.T) { + a, b := uint32(57623283), uint32(1314713839) + if want, got := uint32(38551779), testBitwiseAnd_ssa(a, b); want != got { + t.Errorf("testBitwiseAnd failed, wanted %d got %d", want, got) + } + if want, got := uint32(1333785343), testBitwiseOr_ssa(a, b); want != got { + t.Errorf("testBitwiseOr failed, wanted %d got %d", want, got) + } + if want, got := uint32(1295233564), testBitwiseXor_ssa(a, b); want != got { + t.Errorf("testBitwiseXor failed, wanted %d got %d", want, got) + } + if want, got := int32(832), testBitwiseLsh_ssa(13, 4, 2); want != got { + t.Errorf("testBitwiseLsh failed, wanted %d got %d", want, got) + } + if want, got := int32(0), testBitwiseLsh_ssa(13, 25, 15); want != got { + t.Errorf("testBitwiseLsh failed, wanted %d got %d", want, got) + } + if want, got := int32(0), testBitwiseLsh_ssa(-13, 25, 15); want != got { + t.Errorf("testBitwiseLsh failed, wanted %d got %d", want, got) + } + if want, got := int32(-13), testBitwiseRsh_ssa(-832, 4, 2); want != got { + t.Errorf("testBitwiseRsh failed, wanted %d got %d", want, got) + } + if want, got := int32(0), testBitwiseRsh_ssa(13, 25, 15); want != got { + t.Errorf("testBitwiseRsh failed, wanted %d got %d", want, got) + } + if want, got := int32(-1), testBitwiseRsh_ssa(-13, 25, 15); want != got { + t.Errorf("testBitwiseRsh failed, wanted %d got %d", want, got) + } + if want, got := uint32(0x3ffffff), testBitwiseRshU_ssa(0xffffffff, 4, 2); want != got { + t.Errorf("testBitwiseRshU failed, wanted %d got %d", want, got) + } + if want, got := uint32(0), testBitwiseRshU_ssa(13, 25, 15); want != got { + t.Errorf("testBitwiseRshU failed, wanted %d got %d", want, got) + } + if want, got := uint32(0), testBitwiseRshU_ssa(0x8aaaaaaa, 25, 15); want != got { + t.Errorf("testBitwiseRshU failed, wanted %d got %d", want, got) + } +} + +//go:noinline +func testBitwiseAnd_ssa(a, b uint32) uint32 { + return a & b +} + +//go:noinline +func testBitwiseOr_ssa(a, b uint32) uint32 { + return a | b +} + +//go:noinline +func testBitwiseXor_ssa(a, b uint32) uint32 { + return a ^ b +} + +//go:noinline +func testBitwiseLsh_ssa(a int32, b, c uint32) int32 { + return a << b << c +} + +//go:noinline +func testBitwiseRsh_ssa(a int32, b, c uint32) int32 { + return a >> b >> c +} + +//go:noinline +func testBitwiseRshU_ssa(a uint32, b, c uint32) uint32 { + return a >> b >> c +} + +//go:noinline +func testShiftCX_ssa() int { + v1 := uint8(3) + v4 := (v1 * v1) ^ v1 | v1 - v1 - v1&v1 ^ uint8(3+2) + v1*1>>0 - v1 | 1 | v1<<(2*3|0-0*0^1) + v5 := v4>>(3-0-uint(3)) | v1 | v1 + v1 ^ v4<<(0+1|3&1)<<(uint64(1)<<0*2*0<<0) ^ v1 + v6 := v5 ^ (v1+v1)*v1 | v1 | v1*v1>>(v1&v1)>>(uint(1)<<0*uint(3)>>1)*v1<<2*v1<<v1 - v1>>2 | (v4 - v1) ^ v1 + v1 ^ v1>>1 | v1 + v1 - v1 ^ v1 + v7 := v6 & v5 << 0 + v1++ + v11 := 2&1 ^ 0 + 3 | int(0^0)<<1>>(1*0*3) ^ 0*0 ^ 3&0*3&3 ^ 3*3 ^ 1 ^ int(2)<<(2*3) + 2 | 2 | 2 ^ 2 + 1 | 3 | 0 ^ int(1)>>1 ^ 2 // int + v7-- + return int(uint64(2*1)<<(3-2)<<uint(3>>v7)-2)&v11 | v11 - int(2)<<0>>(2-1)*(v11*0&v11<<1<<(uint8(2)+v4)) +} + +func testShiftCX(t *testing.T) { + want := 141 + if got := testShiftCX_ssa(); want != got { + t.Errorf("testShiftCX failed, wanted %d got %d", want, got) + } +} + +// testSubqToNegq ensures that the SUBQ -> NEGQ translation works correctly. +func testSubqToNegq(t *testing.T) { + want := int64(-318294940372190156) + if got := testSubqToNegq_ssa(1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2); want != got { + t.Errorf("testSubqToNegq failed, wanted %d got %d", want, got) + } +} + +//go:noinline +func testSubqToNegq_ssa(a, b, c, d, e, f, g, h, i, j, k int64) int64 { + return a + 8207351403619448057 - b - 1779494519303207690 + c*8810076340510052032*d - 4465874067674546219 - e*4361839741470334295 - f + 8688847565426072650*g*8065564729145417479 +} + +func testOcom(t *testing.T) { + want1, want2 := int32(0x55555555), int32(-0x55555556) + if got1, got2 := testOcom_ssa(0x55555555, 0x55555555); want1 != got1 || want2 != got2 { + t.Errorf("testOcom failed, wanted %d and %d got %d and %d", want1, want2, got1, got2) + } +} + +//go:noinline +func testOcom_ssa(a, b int32) (int32, int32) { + return ^^^^a, ^^^^^b +} + +func lrot1_ssa(w uint8, x uint16, y uint32, z uint64) (a uint8, b uint16, c uint32, d uint64) { + a = (w << 5) | (w >> 3) + b = (x << 13) | (x >> 3) + c = (y << 29) | (y >> 3) + d = (z << 61) | (z >> 3) + return +} + +//go:noinline +func lrot2_ssa(w, n uint32) uint32 { + // Want to be sure that a "rotate by 32" which + // is really 0 | (w >> 0) == w + // is correctly compiled. + return (w << n) | (w >> (32 - n)) +} + +//go:noinline +func lrot3_ssa(w uint32) uint32 { + // Want to be sure that a "rotate by 32" which + // is really 0 | (w >> 0) == w + // is correctly compiled. + return (w << 32) | (w >> (32 - 32)) +} + +func testLrot(t *testing.T) { + wantA, wantB, wantC, wantD := uint8(0xe1), uint16(0xe001), + uint32(0xe0000001), uint64(0xe000000000000001) + a, b, c, d := lrot1_ssa(0xf, 0xf, 0xf, 0xf) + if a != wantA || b != wantB || c != wantC || d != wantD { + t.Errorf("lrot1_ssa(0xf, 0xf, 0xf, 0xf)=%d %d %d %d, got %d %d %d %d", wantA, wantB, wantC, wantD, a, b, c, d) + } + x := lrot2_ssa(0xb0000001, 32) + wantX := uint32(0xb0000001) + if x != wantX { + t.Errorf("lrot2_ssa(0xb0000001, 32)=%d, got %d", wantX, x) + } + x = lrot3_ssa(0xb0000001) + if x != wantX { + t.Errorf("lrot3_ssa(0xb0000001)=%d, got %d", wantX, x) + } + +} + +//go:noinline +func sub1_ssa() uint64 { + v1 := uint64(3) // uint64 + return v1*v1 - (v1&v1)&v1 +} + +//go:noinline +func sub2_ssa() uint8 { + v1 := uint8(0) + v3 := v1 + v1 + v1 ^ v1 | 3 + v1 ^ v1 | v1 ^ v1 + v1-- // dev.ssa doesn't see this one + return v1 ^ v1*v1 - v3 +} + +func testSubConst(t *testing.T) { + x1 := sub1_ssa() + want1 := uint64(6) + if x1 != want1 { + t.Errorf("sub1_ssa()=%d, got %d", want1, x1) + } + x2 := sub2_ssa() + want2 := uint8(251) + if x2 != want2 { + t.Errorf("sub2_ssa()=%d, got %d", want2, x2) + } +} + +//go:noinline +func orPhi_ssa(a bool, x int) int { + v := 0 + if a { + v = -1 + } else { + v = -1 + } + return x | v +} + +func testOrPhi(t *testing.T) { + if want, got := -1, orPhi_ssa(true, 4); got != want { + t.Errorf("orPhi_ssa(true, 4)=%d, want %d", got, want) + } + if want, got := -1, orPhi_ssa(false, 0); got != want { + t.Errorf("orPhi_ssa(false, 0)=%d, want %d", got, want) + } +} + +//go:noinline +func addshiftLL_ssa(a, b uint32) uint32 { + return a + b<<3 +} + +//go:noinline +func subshiftLL_ssa(a, b uint32) uint32 { + return a - b<<3 +} + +//go:noinline +func rsbshiftLL_ssa(a, b uint32) uint32 { + return a<<3 - b +} + +//go:noinline +func andshiftLL_ssa(a, b uint32) uint32 { + return a & (b << 3) +} + +//go:noinline +func orshiftLL_ssa(a, b uint32) uint32 { + return a | b<<3 +} + +//go:noinline +func xorshiftLL_ssa(a, b uint32) uint32 { + return a ^ b<<3 +} + +//go:noinline +func bicshiftLL_ssa(a, b uint32) uint32 { + return a &^ (b << 3) +} + +//go:noinline +func notshiftLL_ssa(a uint32) uint32 { + return ^(a << 3) +} + +//go:noinline +func addshiftRL_ssa(a, b uint32) uint32 { + return a + b>>3 +} + +//go:noinline +func subshiftRL_ssa(a, b uint32) uint32 { + return a - b>>3 +} + +//go:noinline +func rsbshiftRL_ssa(a, b uint32) uint32 { + return a>>3 - b +} + +//go:noinline +func andshiftRL_ssa(a, b uint32) uint32 { + return a & (b >> 3) +} + +//go:noinline +func orshiftRL_ssa(a, b uint32) uint32 { + return a | b>>3 +} + +//go:noinline +func xorshiftRL_ssa(a, b uint32) uint32 { + return a ^ b>>3 +} + +//go:noinline +func bicshiftRL_ssa(a, b uint32) uint32 { + return a &^ (b >> 3) +} + +//go:noinline +func notshiftRL_ssa(a uint32) uint32 { + return ^(a >> 3) +} + +//go:noinline +func addshiftRA_ssa(a, b int32) int32 { + return a + b>>3 +} + +//go:noinline +func subshiftRA_ssa(a, b int32) int32 { + return a - b>>3 +} + +//go:noinline +func rsbshiftRA_ssa(a, b int32) int32 { + return a>>3 - b +} + +//go:noinline +func andshiftRA_ssa(a, b int32) int32 { + return a & (b >> 3) +} + +//go:noinline +func orshiftRA_ssa(a, b int32) int32 { + return a | b>>3 +} + +//go:noinline +func xorshiftRA_ssa(a, b int32) int32 { + return a ^ b>>3 +} + +//go:noinline +func bicshiftRA_ssa(a, b int32) int32 { + return a &^ (b >> 3) +} + +//go:noinline +func notshiftRA_ssa(a int32) int32 { + return ^(a >> 3) +} + +//go:noinline +func addshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a + b<<s +} + +//go:noinline +func subshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a - b<<s +} + +//go:noinline +func rsbshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a<<s - b +} + +//go:noinline +func andshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a & (b << s) +} + +//go:noinline +func orshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a | b<<s +} + +//go:noinline +func xorshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a ^ b<<s +} + +//go:noinline +func bicshiftLLreg_ssa(a, b uint32, s uint8) uint32 { + return a &^ (b << s) +} + +//go:noinline +func notshiftLLreg_ssa(a uint32, s uint8) uint32 { + return ^(a << s) +} + +//go:noinline +func addshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a + b>>s +} + +//go:noinline +func subshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a - b>>s +} + +//go:noinline +func rsbshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a>>s - b +} + +//go:noinline +func andshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a & (b >> s) +} + +//go:noinline +func orshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a | b>>s +} + +//go:noinline +func xorshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a ^ b>>s +} + +//go:noinline +func bicshiftRLreg_ssa(a, b uint32, s uint8) uint32 { + return a &^ (b >> s) +} + +//go:noinline +func notshiftRLreg_ssa(a uint32, s uint8) uint32 { + return ^(a >> s) +} + +//go:noinline +func addshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a + b>>s +} + +//go:noinline +func subshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a - b>>s +} + +//go:noinline +func rsbshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a>>s - b +} + +//go:noinline +func andshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a & (b >> s) +} + +//go:noinline +func orshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a | b>>s +} + +//go:noinline +func xorshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a ^ b>>s +} + +//go:noinline +func bicshiftRAreg_ssa(a, b int32, s uint8) int32 { + return a &^ (b >> s) +} + +//go:noinline +func notshiftRAreg_ssa(a int32, s uint8) int32 { + return ^(a >> s) +} + +// test ARM shifted ops +func testShiftedOps(t *testing.T) { + a, b := uint32(10), uint32(42) + if want, got := a+b<<3, addshiftLL_ssa(a, b); got != want { + t.Errorf("addshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a-b<<3, subshiftLL_ssa(a, b); got != want { + t.Errorf("subshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a<<3-b, rsbshiftLL_ssa(a, b); got != want { + t.Errorf("rsbshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a&(b<<3), andshiftLL_ssa(a, b); got != want { + t.Errorf("andshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a|b<<3, orshiftLL_ssa(a, b); got != want { + t.Errorf("orshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a^b<<3, xorshiftLL_ssa(a, b); got != want { + t.Errorf("xorshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a&^(b<<3), bicshiftLL_ssa(a, b); got != want { + t.Errorf("bicshiftLL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := ^(a << 3), notshiftLL_ssa(a); got != want { + t.Errorf("notshiftLL_ssa(10) = %d want %d", got, want) + } + if want, got := a+b>>3, addshiftRL_ssa(a, b); got != want { + t.Errorf("addshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a-b>>3, subshiftRL_ssa(a, b); got != want { + t.Errorf("subshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a>>3-b, rsbshiftRL_ssa(a, b); got != want { + t.Errorf("rsbshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a&(b>>3), andshiftRL_ssa(a, b); got != want { + t.Errorf("andshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a|b>>3, orshiftRL_ssa(a, b); got != want { + t.Errorf("orshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a^b>>3, xorshiftRL_ssa(a, b); got != want { + t.Errorf("xorshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := a&^(b>>3), bicshiftRL_ssa(a, b); got != want { + t.Errorf("bicshiftRL_ssa(10, 42) = %d want %d", got, want) + } + if want, got := ^(a >> 3), notshiftRL_ssa(a); got != want { + t.Errorf("notshiftRL_ssa(10) = %d want %d", got, want) + } + c, d := int32(10), int32(-42) + if want, got := c+d>>3, addshiftRA_ssa(c, d); got != want { + t.Errorf("addshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := c-d>>3, subshiftRA_ssa(c, d); got != want { + t.Errorf("subshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := c>>3-d, rsbshiftRA_ssa(c, d); got != want { + t.Errorf("rsbshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := c&(d>>3), andshiftRA_ssa(c, d); got != want { + t.Errorf("andshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := c|d>>3, orshiftRA_ssa(c, d); got != want { + t.Errorf("orshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := c^d>>3, xorshiftRA_ssa(c, d); got != want { + t.Errorf("xorshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := c&^(d>>3), bicshiftRA_ssa(c, d); got != want { + t.Errorf("bicshiftRA_ssa(10, -42) = %d want %d", got, want) + } + if want, got := ^(d >> 3), notshiftRA_ssa(d); got != want { + t.Errorf("notshiftRA_ssa(-42) = %d want %d", got, want) + } + s := uint8(3) + if want, got := a+b<<s, addshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("addshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a-b<<s, subshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("subshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a<<s-b, rsbshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("rsbshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a&(b<<s), andshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("andshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a|b<<s, orshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("orshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a^b<<s, xorshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("xorshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a&^(b<<s), bicshiftLLreg_ssa(a, b, s); got != want { + t.Errorf("bicshiftLLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := ^(a << s), notshiftLLreg_ssa(a, s); got != want { + t.Errorf("notshiftLLreg_ssa(10) = %d want %d", got, want) + } + if want, got := a+b>>s, addshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("addshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a-b>>s, subshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("subshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a>>s-b, rsbshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("rsbshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a&(b>>s), andshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("andshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a|b>>s, orshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("orshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a^b>>s, xorshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("xorshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := a&^(b>>s), bicshiftRLreg_ssa(a, b, s); got != want { + t.Errorf("bicshiftRLreg_ssa(10, 42, 3) = %d want %d", got, want) + } + if want, got := ^(a >> s), notshiftRLreg_ssa(a, s); got != want { + t.Errorf("notshiftRLreg_ssa(10) = %d want %d", got, want) + } + if want, got := c+d>>s, addshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("addshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := c-d>>s, subshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("subshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := c>>s-d, rsbshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("rsbshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := c&(d>>s), andshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("andshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := c|d>>s, orshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("orshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := c^d>>s, xorshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("xorshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := c&^(d>>s), bicshiftRAreg_ssa(c, d, s); got != want { + t.Errorf("bicshiftRAreg_ssa(10, -42, 3) = %d want %d", got, want) + } + if want, got := ^(d >> s), notshiftRAreg_ssa(d, s); got != want { + t.Errorf("notshiftRAreg_ssa(-42, 3) = %d want %d", got, want) + } +} + +// TestArithmetic tests that both backends have the same result for arithmetic expressions. +func TestArithmetic(t *testing.T) { + test64BitConstMult(t) + test64BitConstAdd(t) + testRegallocCVSpill(t) + testSubqToNegq(t) + testBitwiseLogic(t) + testOcom(t) + testLrot(t) + testShiftCX(t) + testSubConst(t) + testOverflowConstShift(t) + testArithConstShift(t) + testArithRshConst(t) + testLargeConst(t) + testLoadCombine(t) + testLoadSymCombine(t) + testShiftRemoval(t) + testShiftedOps(t) + testDivFixUp(t) + testDivisibleSignedPow2(t) + testDivisibility(t) +} + +// testDivFixUp ensures that signed division fix-ups are being generated. +func testDivFixUp(t *testing.T) { + defer func() { + if r := recover(); r != nil { + t.Error("testDivFixUp failed") + if e, ok := r.(runtime.Error); ok { + t.Logf("%v\n", e.Error()) + } + } + }() + var w int8 = -128 + var x int16 = -32768 + var y int32 = -2147483648 + var z int64 = -9223372036854775808 + + for i := -5; i < 0; i++ { + g8 = w / int8(i) + g16 = x / int16(i) + g32 = y / int32(i) + g64 = z / int64(i) + g8 = w % int8(i) + g16 = x % int16(i) + g32 = y % int32(i) + g64 = z % int64(i) + } +} + +//go:noinline +func divisible_int8_2to1(x int8) bool { + return x%(1<<1) == 0 +} + +//go:noinline +func divisible_int8_2to2(x int8) bool { + return x%(1<<2) == 0 +} + +//go:noinline +func divisible_int8_2to3(x int8) bool { + return x%(1<<3) == 0 +} + +//go:noinline +func divisible_int8_2to4(x int8) bool { + return x%(1<<4) == 0 +} + +//go:noinline +func divisible_int8_2to5(x int8) bool { + return x%(1<<5) == 0 +} + +//go:noinline +func divisible_int8_2to6(x int8) bool { + return x%(1<<6) == 0 +} + +//go:noinline +func divisible_int16_2to1(x int16) bool { + return x%(1<<1) == 0 +} + +//go:noinline +func divisible_int16_2to2(x int16) bool { + return x%(1<<2) == 0 +} + +//go:noinline +func divisible_int16_2to3(x int16) bool { + return x%(1<<3) == 0 +} + +//go:noinline +func divisible_int16_2to4(x int16) bool { + return x%(1<<4) == 0 +} + +//go:noinline +func divisible_int16_2to5(x int16) bool { + return x%(1<<5) == 0 +} + +//go:noinline +func divisible_int16_2to6(x int16) bool { + return x%(1<<6) == 0 +} + +//go:noinline +func divisible_int16_2to7(x int16) bool { + return x%(1<<7) == 0 +} + +//go:noinline +func divisible_int16_2to8(x int16) bool { + return x%(1<<8) == 0 +} + +//go:noinline +func divisible_int16_2to9(x int16) bool { + return x%(1<<9) == 0 +} + +//go:noinline +func divisible_int16_2to10(x int16) bool { + return x%(1<<10) == 0 +} + +//go:noinline +func divisible_int16_2to11(x int16) bool { + return x%(1<<11) == 0 +} + +//go:noinline +func divisible_int16_2to12(x int16) bool { + return x%(1<<12) == 0 +} + +//go:noinline +func divisible_int16_2to13(x int16) bool { + return x%(1<<13) == 0 +} + +//go:noinline +func divisible_int16_2to14(x int16) bool { + return x%(1<<14) == 0 +} + +//go:noinline +func divisible_int32_2to4(x int32) bool { + return x%(1<<4) == 0 +} + +//go:noinline +func divisible_int32_2to15(x int32) bool { + return x%(1<<15) == 0 +} + +//go:noinline +func divisible_int32_2to26(x int32) bool { + return x%(1<<26) == 0 +} + +//go:noinline +func divisible_int64_2to4(x int64) bool { + return x%(1<<4) == 0 +} + +//go:noinline +func divisible_int64_2to15(x int64) bool { + return x%(1<<15) == 0 +} + +//go:noinline +func divisible_int64_2to26(x int64) bool { + return x%(1<<26) == 0 +} + +//go:noinline +func divisible_int64_2to34(x int64) bool { + return x%(1<<34) == 0 +} + +//go:noinline +func divisible_int64_2to48(x int64) bool { + return x%(1<<48) == 0 +} + +//go:noinline +func divisible_int64_2to57(x int64) bool { + return x%(1<<57) == 0 +} + +// testDivisibleSignedPow2 confirms that x%(1<<k)==0 is rewritten correctly +func testDivisibleSignedPow2(t *testing.T) { + var i int64 + var pow2 = []int64{ + 1, + 1 << 1, + 1 << 2, + 1 << 3, + 1 << 4, + 1 << 5, + 1 << 6, + 1 << 7, + 1 << 8, + 1 << 9, + 1 << 10, + 1 << 11, + 1 << 12, + 1 << 13, + 1 << 14, + } + // exhaustive test for int8 + for i = math.MinInt8; i <= math.MaxInt8; i++ { + if want, got := int8(i)%int8(pow2[1]) == 0, divisible_int8_2to1(int8(i)); got != want { + t.Errorf("divisible_int8_2to1(%d) = %v want %v", i, got, want) + } + if want, got := int8(i)%int8(pow2[2]) == 0, divisible_int8_2to2(int8(i)); got != want { + t.Errorf("divisible_int8_2to2(%d) = %v want %v", i, got, want) + } + if want, got := int8(i)%int8(pow2[3]) == 0, divisible_int8_2to3(int8(i)); got != want { + t.Errorf("divisible_int8_2to3(%d) = %v want %v", i, got, want) + } + if want, got := int8(i)%int8(pow2[4]) == 0, divisible_int8_2to4(int8(i)); got != want { + t.Errorf("divisible_int8_2to4(%d) = %v want %v", i, got, want) + } + if want, got := int8(i)%int8(pow2[5]) == 0, divisible_int8_2to5(int8(i)); got != want { + t.Errorf("divisible_int8_2to5(%d) = %v want %v", i, got, want) + } + if want, got := int8(i)%int8(pow2[6]) == 0, divisible_int8_2to6(int8(i)); got != want { + t.Errorf("divisible_int8_2to6(%d) = %v want %v", i, got, want) + } + } + // exhaustive test for int16 + for i = math.MinInt16; i <= math.MaxInt16; i++ { + if want, got := int16(i)%int16(pow2[1]) == 0, divisible_int16_2to1(int16(i)); got != want { + t.Errorf("divisible_int16_2to1(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[2]) == 0, divisible_int16_2to2(int16(i)); got != want { + t.Errorf("divisible_int16_2to2(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[3]) == 0, divisible_int16_2to3(int16(i)); got != want { + t.Errorf("divisible_int16_2to3(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[4]) == 0, divisible_int16_2to4(int16(i)); got != want { + t.Errorf("divisible_int16_2to4(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[5]) == 0, divisible_int16_2to5(int16(i)); got != want { + t.Errorf("divisible_int16_2to5(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[6]) == 0, divisible_int16_2to6(int16(i)); got != want { + t.Errorf("divisible_int16_2to6(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[7]) == 0, divisible_int16_2to7(int16(i)); got != want { + t.Errorf("divisible_int16_2to7(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[8]) == 0, divisible_int16_2to8(int16(i)); got != want { + t.Errorf("divisible_int16_2to8(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[9]) == 0, divisible_int16_2to9(int16(i)); got != want { + t.Errorf("divisible_int16_2to9(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[10]) == 0, divisible_int16_2to10(int16(i)); got != want { + t.Errorf("divisible_int16_2to10(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[11]) == 0, divisible_int16_2to11(int16(i)); got != want { + t.Errorf("divisible_int16_2to11(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[12]) == 0, divisible_int16_2to12(int16(i)); got != want { + t.Errorf("divisible_int16_2to12(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[13]) == 0, divisible_int16_2to13(int16(i)); got != want { + t.Errorf("divisible_int16_2to13(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(pow2[14]) == 0, divisible_int16_2to14(int16(i)); got != want { + t.Errorf("divisible_int16_2to14(%d) = %v want %v", i, got, want) + } + } + // spot check for int32 and int64 + var ( + two4 int64 = 1 << 4 + two15 int64 = 1 << 15 + two26 int64 = 1 << 26 + two34 int64 = 1 << 34 + two48 int64 = 1 << 48 + two57 int64 = 1 << 57 + ) + var xs = []int64{two4, two4 + 3, -3 * two4, -3*two4 + 1, + two15, two15 + 3, -3 * two15, -3*two15 + 1, + two26, two26 + 37, -5 * two26, -5*two26 + 2, + two34, two34 + 356, -7 * two34, -7*two34 + 13, + two48, two48 + 3000, -12 * two48, -12*two48 + 1111, + two57, two57 + 397654, -15 * two57, -15*two57 + 11234, + } + for _, x := range xs { + if int64(int32(x)) == x { + if want, got := int32(x)%int32(two4) == 0, divisible_int32_2to4(int32(x)); got != want { + t.Errorf("divisible_int32_2to4(%d) = %v want %v", x, got, want) + } + + if want, got := int32(x)%int32(two15) == 0, divisible_int32_2to15(int32(x)); got != want { + t.Errorf("divisible_int32_2to15(%d) = %v want %v", x, got, want) + } + + if want, got := int32(x)%int32(two26) == 0, divisible_int32_2to26(int32(x)); got != want { + t.Errorf("divisible_int32_2to26(%d) = %v want %v", x, got, want) + } + } + // spot check for int64 + if want, got := x%two4 == 0, divisible_int64_2to4(x); got != want { + t.Errorf("divisible_int64_2to4(%d) = %v want %v", x, got, want) + } + + if want, got := x%two15 == 0, divisible_int64_2to15(x); got != want { + t.Errorf("divisible_int64_2to15(%d) = %v want %v", x, got, want) + } + + if want, got := x%two26 == 0, divisible_int64_2to26(x); got != want { + t.Errorf("divisible_int64_2to26(%d) = %v want %v", x, got, want) + } + + if want, got := x%two34 == 0, divisible_int64_2to34(x); got != want { + t.Errorf("divisible_int64_2to34(%d) = %v want %v", x, got, want) + } + + if want, got := x%two48 == 0, divisible_int64_2to48(x); got != want { + t.Errorf("divisible_int64_2to48(%d) = %v want %v", x, got, want) + } + + if want, got := x%two57 == 0, divisible_int64_2to57(x); got != want { + t.Errorf("divisible_int64_2to57(%d) = %v want %v", x, got, want) + } + } +} + +func div6_uint8(n uint8) bool { + return n%6 == 0 +} + +//go:noinline +func div6_uint16(n uint16) bool { + return n%6 == 0 +} + +//go:noinline +func div6_uint32(n uint32) bool { + return n%6 == 0 +} + +//go:noinline +func div6_uint64(n uint64) bool { + return n%6 == 0 +} + +//go:noinline +func div19_uint8(n uint8) bool { + return n%19 == 0 +} + +//go:noinline +func div19_uint16(n uint16) bool { + return n%19 == 0 +} + +//go:noinline +func div19_uint32(n uint32) bool { + return n%19 == 0 +} + +//go:noinline +func div19_uint64(n uint64) bool { + return n%19 == 0 +} + +//go:noinline +func div6_int8(n int8) bool { + return n%6 == 0 +} + +//go:noinline +func div6_int16(n int16) bool { + return n%6 == 0 +} + +//go:noinline +func div6_int32(n int32) bool { + return n%6 == 0 +} + +//go:noinline +func div6_int64(n int64) bool { + return n%6 == 0 +} + +//go:noinline +func div19_int8(n int8) bool { + return n%19 == 0 +} + +//go:noinline +func div19_int16(n int16) bool { + return n%19 == 0 +} + +//go:noinline +func div19_int32(n int32) bool { + return n%19 == 0 +} + +//go:noinline +func div19_int64(n int64) bool { + return n%19 == 0 +} + +// testDivisibility confirms that rewrite rules x%c ==0 for c constant are correct. +func testDivisibility(t *testing.T) { + // unsigned tests + // test an even and an odd divisor + var sixU, nineteenU uint64 = 6, 19 + // test all inputs for uint8, uint16 + for i := uint64(0); i <= math.MaxUint16; i++ { + if i <= math.MaxUint8 { + if want, got := uint8(i)%uint8(sixU) == 0, div6_uint8(uint8(i)); got != want { + t.Errorf("div6_uint8(%d) = %v want %v", i, got, want) + } + if want, got := uint8(i)%uint8(nineteenU) == 0, div19_uint8(uint8(i)); got != want { + t.Errorf("div6_uint19(%d) = %v want %v", i, got, want) + } + } + if want, got := uint16(i)%uint16(sixU) == 0, div6_uint16(uint16(i)); got != want { + t.Errorf("div6_uint16(%d) = %v want %v", i, got, want) + } + if want, got := uint16(i)%uint16(nineteenU) == 0, div19_uint16(uint16(i)); got != want { + t.Errorf("div19_uint16(%d) = %v want %v", i, got, want) + } + } + var maxU32, maxU64 uint64 = math.MaxUint32, math.MaxUint64 + // spot check inputs for uint32 and uint64 + xu := []uint64{ + 0, 1, 2, 3, 4, 5, + sixU, 2 * sixU, 3 * sixU, 5 * sixU, 12345 * sixU, + sixU + 1, 2*sixU - 5, 3*sixU + 3, 5*sixU + 4, 12345*sixU - 2, + nineteenU, 2 * nineteenU, 3 * nineteenU, 5 * nineteenU, 12345 * nineteenU, + nineteenU + 1, 2*nineteenU - 5, 3*nineteenU + 3, 5*nineteenU + 4, 12345*nineteenU - 2, + maxU32, maxU32 - 1, maxU32 - 2, maxU32 - 3, maxU32 - 4, + maxU32 - 5, maxU32 - 6, maxU32 - 7, maxU32 - 8, + maxU32 - 9, maxU32 - 10, maxU32 - 11, maxU32 - 12, + maxU32 - 13, maxU32 - 14, maxU32 - 15, maxU32 - 16, + maxU32 - 17, maxU32 - 18, maxU32 - 19, maxU32 - 20, + maxU64, maxU64 - 1, maxU64 - 2, maxU64 - 3, maxU64 - 4, + maxU64 - 5, maxU64 - 6, maxU64 - 7, maxU64 - 8, + maxU64 - 9, maxU64 - 10, maxU64 - 11, maxU64 - 12, + maxU64 - 13, maxU64 - 14, maxU64 - 15, maxU64 - 16, + maxU64 - 17, maxU64 - 18, maxU64 - 19, maxU64 - 20, + } + for _, x := range xu { + if x <= maxU32 { + if want, got := uint32(x)%uint32(sixU) == 0, div6_uint32(uint32(x)); got != want { + t.Errorf("div6_uint32(%d) = %v want %v", x, got, want) + } + if want, got := uint32(x)%uint32(nineteenU) == 0, div19_uint32(uint32(x)); got != want { + t.Errorf("div19_uint32(%d) = %v want %v", x, got, want) + } + } + if want, got := x%sixU == 0, div6_uint64(x); got != want { + t.Errorf("div6_uint64(%d) = %v want %v", x, got, want) + } + if want, got := x%nineteenU == 0, div19_uint64(x); got != want { + t.Errorf("div19_uint64(%d) = %v want %v", x, got, want) + } + } + + // signed tests + // test an even and an odd divisor + var sixS, nineteenS int64 = 6, 19 + // test all inputs for int8, int16 + for i := int64(math.MinInt16); i <= math.MaxInt16; i++ { + if math.MinInt8 <= i && i <= math.MaxInt8 { + if want, got := int8(i)%int8(sixS) == 0, div6_int8(int8(i)); got != want { + t.Errorf("div6_int8(%d) = %v want %v", i, got, want) + } + if want, got := int8(i)%int8(nineteenS) == 0, div19_int8(int8(i)); got != want { + t.Errorf("div6_int19(%d) = %v want %v", i, got, want) + } + } + if want, got := int16(i)%int16(sixS) == 0, div6_int16(int16(i)); got != want { + t.Errorf("div6_int16(%d) = %v want %v", i, got, want) + } + if want, got := int16(i)%int16(nineteenS) == 0, div19_int16(int16(i)); got != want { + t.Errorf("div19_int16(%d) = %v want %v", i, got, want) + } + } + var minI32, maxI32, minI64, maxI64 int64 = math.MinInt32, math.MaxInt32, math.MinInt64, math.MaxInt64 + // spot check inputs for int32 and int64 + xs := []int64{ + 0, 1, 2, 3, 4, 5, + -1, -2, -3, -4, -5, + sixS, 2 * sixS, 3 * sixS, 5 * sixS, 12345 * sixS, + sixS + 1, 2*sixS - 5, 3*sixS + 3, 5*sixS + 4, 12345*sixS - 2, + -sixS, -2 * sixS, -3 * sixS, -5 * sixS, -12345 * sixS, + -sixS + 1, -2*sixS - 5, -3*sixS + 3, -5*sixS + 4, -12345*sixS - 2, + nineteenS, 2 * nineteenS, 3 * nineteenS, 5 * nineteenS, 12345 * nineteenS, + nineteenS + 1, 2*nineteenS - 5, 3*nineteenS + 3, 5*nineteenS + 4, 12345*nineteenS - 2, + -nineteenS, -2 * nineteenS, -3 * nineteenS, -5 * nineteenS, -12345 * nineteenS, + -nineteenS + 1, -2*nineteenS - 5, -3*nineteenS + 3, -5*nineteenS + 4, -12345*nineteenS - 2, + minI32, minI32 + 1, minI32 + 2, minI32 + 3, minI32 + 4, + minI32 + 5, minI32 + 6, minI32 + 7, minI32 + 8, + minI32 + 9, minI32 + 10, minI32 + 11, minI32 + 12, + minI32 + 13, minI32 + 14, minI32 + 15, minI32 + 16, + minI32 + 17, minI32 + 18, minI32 + 19, minI32 + 20, + maxI32, maxI32 - 1, maxI32 - 2, maxI32 - 3, maxI32 - 4, + maxI32 - 5, maxI32 - 6, maxI32 - 7, maxI32 - 8, + maxI32 - 9, maxI32 - 10, maxI32 - 11, maxI32 - 12, + maxI32 - 13, maxI32 - 14, maxI32 - 15, maxI32 - 16, + maxI32 - 17, maxI32 - 18, maxI32 - 19, maxI32 - 20, + minI64, minI64 + 1, minI64 + 2, minI64 + 3, minI64 + 4, + minI64 + 5, minI64 + 6, minI64 + 7, minI64 + 8, + minI64 + 9, minI64 + 10, minI64 + 11, minI64 + 12, + minI64 + 13, minI64 + 14, minI64 + 15, minI64 + 16, + minI64 + 17, minI64 + 18, minI64 + 19, minI64 + 20, + maxI64, maxI64 - 1, maxI64 - 2, maxI64 - 3, maxI64 - 4, + maxI64 - 5, maxI64 - 6, maxI64 - 7, maxI64 - 8, + maxI64 - 9, maxI64 - 10, maxI64 - 11, maxI64 - 12, + maxI64 - 13, maxI64 - 14, maxI64 - 15, maxI64 - 16, + maxI64 - 17, maxI64 - 18, maxI64 - 19, maxI64 - 20, + } + for _, x := range xs { + if minI32 <= x && x <= maxI32 { + if want, got := int32(x)%int32(sixS) == 0, div6_int32(int32(x)); got != want { + t.Errorf("div6_int32(%d) = %v want %v", x, got, want) + } + if want, got := int32(x)%int32(nineteenS) == 0, div19_int32(int32(x)); got != want { + t.Errorf("div19_int32(%d) = %v want %v", x, got, want) + } + } + if want, got := x%sixS == 0, div6_int64(x); got != want { + t.Errorf("div6_int64(%d) = %v want %v", x, got, want) + } + if want, got := x%nineteenS == 0, div19_int64(x); got != want { + t.Errorf("div19_int64(%d) = %v want %v", x, got, want) + } + } +} |