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| author | Michał Derkacz <michal@Lnet.pl> | 2020-06-14 00:06:24 +0200 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2020-10-28 05:02:44 +0000 |
| commit | 150d2448e5a213cd679396371c0a147918dc2125 (patch) | |
| tree | 7ae047f123b042c4bab3b1ffe27d33dd5c9c959b /src/cmd/compile/internal/riscv64 | |
| parent | c95bd2e6a99ab06efadb265bf42bbaf8d964904f (diff) | |
| download | go-150d2448e5a213cd679396371c0a147918dc2125.tar.gz go-150d2448e5a213cd679396371c0a147918dc2125.zip | |
cmd/compile,cmd/internal/obj/riscv,runtime: use Duff's devices on riscv64
Implement runtime.duffzero and runtime.duffcopy for riscv64.
Use obj.ADUFFZERO/obj.ADUFFCOPY for medium size, word aligned
zeroing/moving.
Change-Id: I42ec622055630c94cb77e286d8d33dbe7c9f846c
Reviewed-on: https://go-review.googlesource.com/c/go/+/237797
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/cmd/compile/internal/riscv64')
| -rw-r--r-- | src/cmd/compile/internal/riscv64/ggen.go | 10 | ||||
| -rw-r--r-- | src/cmd/compile/internal/riscv64/ssa.go | 14 |
2 files changed, 23 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/riscv64/ggen.go b/src/cmd/compile/internal/riscv64/ggen.go index be31fad441..f7c03fe7c2 100644 --- a/src/cmd/compile/internal/riscv64/ggen.go +++ b/src/cmd/compile/internal/riscv64/ggen.go @@ -25,7 +25,15 @@ func zeroRange(pp *gc.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog { return p } - // TODO(jsing): Add a duff zero implementation for medium sized ranges. + if cnt <= int64(128*gc.Widthptr) { + p = pp.Appendpp(p, riscv.AADDI, obj.TYPE_CONST, 0, off, obj.TYPE_REG, riscv.REG_A0, 0) + p.Reg = riscv.REG_SP + p = pp.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0) + p.To.Name = obj.NAME_EXTERN + p.To.Sym = gc.Duffzero + p.To.Offset = 8 * (128 - cnt/int64(gc.Widthptr)) + return p + } // Loop, zeroing pointer width bytes at a time. // ADD $(off), SP, T0 diff --git a/src/cmd/compile/internal/riscv64/ssa.go b/src/cmd/compile/internal/riscv64/ssa.go index 064a1ca111..0beb5b4bd1 100644 --- a/src/cmd/compile/internal/riscv64/ssa.go +++ b/src/cmd/compile/internal/riscv64/ssa.go @@ -608,6 +608,20 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) { p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() + case ssa.OpRISCV64DUFFZERO: + p := s.Prog(obj.ADUFFZERO) + p.To.Type = obj.TYPE_MEM + p.To.Name = obj.NAME_EXTERN + p.To.Sym = gc.Duffzero + p.To.Offset = v.AuxInt + + case ssa.OpRISCV64DUFFCOPY: + p := s.Prog(obj.ADUFFCOPY) + p.To.Type = obj.TYPE_MEM + p.To.Name = obj.NAME_EXTERN + p.To.Sym = gc.Duffcopy + p.To.Offset = v.AuxInt + default: v.Fatalf("Unhandled op %v", v.Op) } |