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| author | Alberto Donizetti <alb.donizetti@gmail.com> | 2018-03-14 11:47:34 +0100 |
|---|---|---|
| committer | Alberto Donizetti <alb.donizetti@gmail.com> | 2018-03-14 15:56:46 +0000 |
| commit | 858042b8fd51ae827e85cd47a0daf2957b84738e (patch) | |
| tree | 1238ac4baeb41e2f859736403132a90a7d09df71 /test/codegen/arithmetic.go | |
| parent | b8d26225c1984286a0c677993047748698ef301b (diff) | |
| download | go-858042b8fd51ae827e85cd47a0daf2957b84738e.tar.xz | |
test/codegen: add codegen tests for div
Change-Id: I6ce8981e85fd55ade6078b0946e54a9215d9deca
Reviewed-on: https://go-review.googlesource.com/100575
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'test/codegen/arithmetic.go')
| -rw-r--r-- | test/codegen/arithmetic.go | 66 |
1 files changed, 63 insertions, 3 deletions
diff --git a/test/codegen/arithmetic.go b/test/codegen/arithmetic.go index 1294cfffd9..20adc84bee 100644 --- a/test/codegen/arithmetic.go +++ b/test/codegen/arithmetic.go @@ -9,6 +9,10 @@ package codegen // This file contains codegen tests related to arithmetic // simplifications/optimizations. +// -------------------- // +// Multiplication // +// -------------------- // + func Pow2Muls(n1, n2 int) (int, int) { // amd64:"SHLQ\t[$]5",-"IMULQ" // 386:"SHLL\t[$]5",-"IMULL" @@ -25,9 +29,7 @@ func Pow2Muls(n1, n2 int) (int, int) { return a, b } -// ------------------ // -// MULs merging // -// ------------------ // +// Multiplications merging tests func MergeMuls1(n int) int { // amd64:"IMUL3Q\t[$]46" @@ -58,3 +60,61 @@ func MergeMuls5(a, n int) int { // 386:"ADDL\t[$]-19",-"IMULL\t[$]19" return a*n - 19*n // (a-19)n } + +// -------------- // +// Division // +// -------------- // + +func Pow2Divs(n1 uint, n2 int) (uint, int) { + // 386:"SHRL\t[$]5",-"DIVL" + // amd64:"SHRQ\t[$]5",-"DIVQ" + // arm:"SRL\t[$]5",-".*udiv" + // arm64:"LSR\t[$]5",-"UDIV" + a := n1 / 32 // unsigned + + // amd64:"SARQ\t[$]6",-"IDIVQ" + // 386:"SARL\t[$]6",-"IDIVL" + // arm:"SRA\t[$]6",-".*udiv" + // arm64:"ASR\t[$]6",-"SDIV" + b := n2 / 64 // signed + + return a, b +} + +// Check that constant divisions get turned into MULs +func ConstDivs(n1 uint, n2 int) (uint, int) { + // amd64:"MOVQ\t[$]-1085102592571150095","MULQ",-"DIVQ" + a := n1 / 17 // unsigned + + // amd64:"MOVQ\t[$]-1085102592571150095","IMULQ",-"IDIVQ" + b := n2 / 17 // signed + + return a, b +} + +func Pow2Mods(n1 uint, n2 int) (uint, int) { + // 386:"ANDL\t[$]31",-"DIVL" + // amd64:"ANDQ\t[$]31",-"DIVQ" + // arm:"AND\t[$]31",-".*udiv" + // arm64:"AND\t[$]31",-"UDIV" + a := n1 % 32 // unsigned + + // 386:-"IDIVL" + // amd64:-"IDIVQ" + // arm:-".*udiv" + // arm64:-"REM" + b := n2 % 64 // signed + + return a, b +} + +// Check that constant modulo divs get turned into MULs +func ConstMods(n1 uint, n2 int) (uint, int) { + // amd64:"MOVQ\t[$]-1085102592571150095","MULQ",-"DIVQ" + a := n1 % 17 // unsigned + + // amd64:"MOVQ\t[$]-1085102592571150095","IMULQ",-"IDIVQ" + b := n2 % 17 // signed + + return a, b +} |