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cmd/compile: remove special handling for OpRISCV64SUBW in markUnsafePoints 

Due to improved optimisation, we no longer emit SUBW for the write barrier
checks on riscv64, hence remove special handling in markUnsafePoints.

Change-Id: Ia1150c3e11f25e183735e58f8716a511d9e90fb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/222638
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Joel Sing 2020-03-10 03:27:44 +11:00
parent da07c59f24
commit 9f74f0afa6
1 changed files with 0 additions and 6 deletions
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6
src/cmd/compile/internal/gc/plive.go
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@ -705,12 +705,6 @@ func (lv *Liveness) markUnsafePoints() {
v = v.Args[0]
continue
}
case ssa.OpRISCV64SUBW:
// RISCV64 lowers Neq32 to include a SUBW with multiple arguments.
// TODO(jsing): it would be preferable not to use Neq32 for
// writeBuffer.enabled checks on this platform.
v = v.Args[0]
continue
case ssa.Op386MOVLload, ssa.OpARM64MOVWUload, ssa.OpPPC64MOVWZload, ssa.OpWasmI64Load32U:
// Args[0] is the address of the write
// barrier control. Ignore Args[1],