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| author | Julian Zhu <jz531210@gmail.com> | 2025-09-04 21:38:47 +0800 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2025-09-05 08:06:50 -0700 |
| commit | bb48272e24ca38676442afc20afb6e0b9a91048b (patch) | |
| tree | 8c93492303b591a32d1e987a65ade5f254a63748 /src/cmd | |
| parent | d52a56cce1cc78eeff753d952d7abfc109f78ead (diff) | |
| download | go-bb48272e24ca38676442afc20afb6e0b9a91048b.tar.xz | |
cmd/compile: simplify zerorange on mips64
Change-Id: I488b55a21eaaf74373c2789a34bf9b3945ced072
Reviewed-on: https://go-review.googlesource.com/c/go/+/700936
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/cmd')
| -rw-r--r-- | src/cmd/compile/internal/mips64/ggen.go | 38 |
1 files changed, 7 insertions, 31 deletions
diff --git a/src/cmd/compile/internal/mips64/ggen.go b/src/cmd/compile/internal/mips64/ggen.go index 5f3f3e64d9..0740d9abe8 100644 --- a/src/cmd/compile/internal/mips64/ggen.go +++ b/src/cmd/compile/internal/mips64/ggen.go @@ -5,7 +5,6 @@ package mips64 import ( - "cmd/compile/internal/ir" "cmd/compile/internal/objw" "cmd/compile/internal/types" "cmd/internal/obj" @@ -13,37 +12,14 @@ import ( ) func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog { - if cnt == 0 { - return p + if cnt%int64(types.PtrSize) != 0 { + panic("zeroed region not aligned") } - if cnt < int64(4*types.PtrSize) { - for i := int64(0); i < cnt; i += int64(types.PtrSize) { - p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, 8+off+i) - } - } else if cnt <= int64(128*types.PtrSize) { - p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, mips.REGRT1, 0) - p.Reg = mips.REGSP - p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0) - p.To.Name = obj.NAME_EXTERN - p.To.Sym = ir.Syms.Duffzero - p.To.Offset = 8 * (128 - cnt/int64(types.PtrSize)) - } else { - // ADDV $(8+frame+lo-8), SP, r1 - // ADDV $cnt, r1, r2 - // loop: - // MOVV R0, (Widthptr)r1 - // ADDV $Widthptr, r1 - // BNE r1, r2, loop - p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, mips.REGRT1, 0) - p.Reg = mips.REGSP - p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, mips.REGRT2, 0) - p.Reg = mips.REGRT1 - p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGRT1, int64(types.PtrSize)) - p1 := p - p = pp.Append(p, mips.AADDV, obj.TYPE_CONST, 0, int64(types.PtrSize), obj.TYPE_REG, mips.REGRT1, 0) - p = pp.Append(p, mips.ABNE, obj.TYPE_REG, mips.REGRT1, 0, obj.TYPE_BRANCH, 0, 0) - p.Reg = mips.REGRT2 - p.To.SetTarget(p1) + + for cnt != 0 { + p = pp.Append(p, mips.AMOVV, obj.TYPE_REG, mips.REGZERO, 0, obj.TYPE_MEM, mips.REGSP, off) + cnt -= int64(types.PtrSize) + off += int64(types.PtrSize) } return p |