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| author | Keith Randall <khr@golang.org> | 2016-01-26 15:47:08 -0800 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2016-01-29 20:22:09 +0000 |
| commit | f94e0745b3dc922ca7f3d15507e33ed6d3a65ee6 (patch) | |
| tree | a63610f5b047079a2502739c26a00716c321fc18 /src/cmd/compile/internal/ssa/flagalloc.go | |
| parent | 5ba31940dc2934dc76a47f0e614d441225ea3a95 (diff) | |
| download | go-f94e0745b3dc922ca7f3d15507e33ed6d3a65ee6.tar.gz go-f94e0745b3dc922ca7f3d15507e33ed6d3a65ee6.zip | |
[dev.ssa] cmd/compile: prepare for some load+op combining
Rename StoreConst to ValAndOff so we can use it for other ops.
Make ValAndOff print nicely.
Add some notes & checks related to my aborted attempt to
implement combined CMP+load ops.
Change-Id: I2f901d12d42bc5a82879af0334806aa184a97e27
Reviewed-on: https://go-review.googlesource.com/18947
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: David Chase <drchase@google.com>
Diffstat (limited to 'src/cmd/compile/internal/ssa/flagalloc.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/flagalloc.go | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/ssa/flagalloc.go b/src/cmd/compile/internal/ssa/flagalloc.go index f4e289e782..85e9c4fbee 100644 --- a/src/cmd/compile/internal/ssa/flagalloc.go +++ b/src/cmd/compile/internal/ssa/flagalloc.go @@ -42,11 +42,14 @@ func flagalloc(f *Func) { } } } - for _, p := range b.Preds { - end[p.ID] = flag + if flag != nil { + for _, p := range b.Preds { + end[p.ID] = flag + } } } } + // For blocks which have a flags control value, that's the only value // we can leave in the flags register at the end of the block. (There // is no place to put a flag regeneration instruction.) |