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[dev.ssa] cmd/compile: remove flags from regMask

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Reg allocator skips flag-typed values. Flag allocator uses the type
and whether the op has "clobberFlags" set.

Tested on AMD64, ARM, ARM64, 386. Passed 'toolstash -cmp' on AMD64.
PPC64 is coded blindly.

Change-Id: Ib1cc27efecef6a1bb27f7d7ed035a582660d244f
Reviewed-on: https://go-review.googlesource.com/25480
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2016-08-04 06:57:34 -04:00
parent 01ae4b1da4
commit 0484052358
11 changed files with 1018 additions and 1415 deletions
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4
src/cmd/compile/internal/ssa/regalloc.go
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@ -1060,10 +1060,6 @@ func (s *regAllocState) regalloc(f *Func) {
args = append(args[:0], v.Args...)
for _, i := range regspec.inputs {
mask := i.regs
if mask == f.Config.flagRegMask {
// TODO: remove flag input from regspec.inputs.
continue
}
if mask&s.values[args[i.idx].ID].regs == 0 {
// Need a new register for the input.
mask &= s.allocatable