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[dev.ssa] cmd/compile: zero register masks for each edge

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Forgot to reset these masks before each merge edge is processed.

Change-Id: I2f593189b63f50a1cd12b2dd4645ca7b9614f1f3
Reviewed-on: https://go-review.googlesource.com/18223
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
This commit is contained in:
Keith Randall 2016-01-04 13:34:54 -08:00
parent 7d9f1067d1
commit d7ad7b9efe
1 changed files with 9 additions and 0 deletions
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9
src/cmd/compile/internal/ssa/regalloc.go
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@ -1052,6 +1052,9 @@ func (e *edgeState) setup(idx int, srcReg []endReg, dstReg []startReg, stacklive
for k := range e.contents {
delete(e.contents, k)
}
e.usedRegs = 0
e.uniqueRegs = 0
e.finalRegs = 0
// Live registers can be sources.
for _, x := range srcReg {
@ -1384,6 +1387,12 @@ func (e *edgeState) findRegFor(typ Type) Location {
}
}
fmt.Printf("m:%d unique:%d final:%d\n", m, e.uniqueRegs, e.finalRegs)
for vid, a := range e.cache {
for _, c := range a {
fmt.Printf("v%d: %s %s\n", vid, c, e.s.f.getHome(c.ID).Name())
}
}
e.s.f.Fatalf("can't find empty register on edge %s->%s", e.p, e.b)
return nil
}