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Revert "cmd/compile: improve register overwrite decision for resultInArg0 ops"

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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>
This commit is contained in:
Keith Randall 2023-01-25 19:08:14 +00:00 • committed by Gopher Robot
parent 3c7884a21b
commit 2bf0f54bbd
1 changed files with 0 additions and 14 deletions
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14
src/cmd/compile/internal/ssa/regalloc.go
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@ -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: