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| author | Keith Randall <khr@golang.org> | 2023-01-25 19:08:14 +0000 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2023-01-25 19:25:48 +0000 |
| commit | 2bf0f54bbd6dfa57fc11444f9b8ba722689e6490 (patch) | |
| tree | dda1e394caa751b3513bbc2b40bbd08b7caca914 | |
| parent | 3c7884a21b2929b5a42d6a1f237f5fee2ae72ba8 (diff) | |
| download | go-2bf0f54bbd6dfa57fc11444f9b8ba722689e6490.tar.xz | |
Revert "cmd/compile: improve register overwrite decision for resultInArg0 ops"
This reverts CL 460656
Reason for revert: This breaks s390x.
Change-Id: I8fada14fabc90593b8033ed11188c04963d2da75
Reviewed-on: https://go-review.googlesource.com/c/go/+/463475
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
| -rw-r--r-- | src/cmd/compile/internal/ssa/regalloc.go | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/src/cmd/compile/internal/ssa/regalloc.go b/src/cmd/compile/internal/ssa/regalloc.go index 05765bb701..294c522a90 100644 --- a/src/cmd/compile/internal/ssa/regalloc.go +++ b/src/cmd/compile/internal/ssa/regalloc.go @@ -1544,7 +1544,6 @@ func (s *regAllocState) regalloc(f *Func) { } } } - // Avoid future fixed uses if we can. if m&^desired.avoid != 0 { m &^= desired.avoid @@ -1552,19 +1551,6 @@ func (s *regAllocState) regalloc(f *Func) { // Save input 0 to a new register so we can clobber it. c := s.allocValToReg(v.Args[0], m, true, v.Pos) s.copies[c] = false - - // Normally we use the register of the old copy of input 0 as the target. - // However, if input 0 is already in its desired register then we use - // the register of the new copy instead. - if rp, ok := s.f.getHome(args[0].ID).(*Register); ok { - r := register(rp.num) - for _, r2 := range dinfo[idx].in[0] { - if r == r2 { - args[0] = c - break - } - } - } } ok: |