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| author | Dmitri Shuralyov <dmitshur@google.com> | 2022-08-01 15:54:13 +0000 |
|---|---|---|
| committer | Dmitri Shuralyov <dmitshur@google.com> | 2022-08-01 15:54:13 +0000 |
| commit | 349da2d42d3193af7f54170ae842166e4571134a (patch) | |
| tree | a0b59dc2dfa4440add9d954efe1908272933247a /src/cmd/compile/internal/ssa/loopbce.go | |
| parent | 7d5078e3bf2d865526e8ec2d211f61b2fac2936f (diff) | |
| parent | 15da892a4950a4caac987ee72c632436329f62d5 (diff) | |
| download | go-dev.boringcrypto.go1.17.tar.gz go-dev.boringcrypto.go1.17.zip | |
[dev.boringcrypto.go1.17] all: merge go1.17.13 into dev.boringcrypto.go1.17dev.boringcrypto.go1.17
Change-Id: Iaf4f2cb506aab9e22a5df5b937c38fc108f1e1c1
Diffstat (limited to 'src/cmd/compile/internal/ssa/loopbce.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/loopbce.go | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/loopbce.go b/src/cmd/compile/internal/ssa/loopbce.go index 5a4bc1d60aa..fd03efb417d 100644 --- a/src/cmd/compile/internal/ssa/loopbce.go +++ b/src/cmd/compile/internal/ssa/loopbce.go @@ -159,6 +159,13 @@ func findIndVar(f *Func) []indVar { step = -step } + if flags&indVarMaxInc != 0 && max.Op == OpConst64 && max.AuxInt+step < max.AuxInt { + // For a <= comparison, we need to make sure that a value equal to + // max can be incremented without overflowing. + // (For a < comparison, the %step check below ensures no overflow.) + continue + } + // Up to now we extracted the induction variable (ind), // the increment delta (inc), the temporary sum (nxt), // the mininum value (min) and the maximum value (max). |