diff options
| author | David Majnemer <david.majnemer@gmail.com> | 2015-09-19 00:48:31 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2015-09-19 00:48:31 +0000 |
| commit | bdf4ccfe9b488e5413647774e7181f20d37ae238 (patch) | |
| tree | 789652fa336d5b04e23d8b39c8f67396635e5444 /test/Transforms/InstCombine/icmp-shr.ll | |
| parent | 1e4af0841002c55ed6302a8c98c8d1c98daa34cb (diff) | |
[InstCombine] FoldICmpCstShrCst failed for ashr when comparing against -1
(icmp eq (ashr C1, %V) -1) may have multiple answers if C1 is not a
power of two and has the sign bit set.
This fixes PR24873.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248074 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/icmp-shr.ll')
| -rw-r--r-- | test/Transforms/InstCombine/icmp-shr.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/icmp-shr.ll b/test/Transforms/InstCombine/icmp-shr.ll index 52414b99cca..4fa85a72baf 100644 --- a/test/Transforms/InstCombine/icmp-shr.ll +++ b/test/Transforms/InstCombine/icmp-shr.ll @@ -376,3 +376,12 @@ define i1 @PR21222(i32 %B) { %cmp = icmp eq i32 %shr, -2 ret i1 %cmp } + +; CHECK-LABEL: @PR24873( +; CHECK: %[[icmp:.*]] = icmp ugt i64 %V, 61 +; CHECK-NEXT: ret i1 %[[icmp]] +define i1 @PR24873(i64 %V) { + %ashr = ashr i64 -4611686018427387904, %V + %icmp = icmp eq i64 %ashr, -1 + ret i1 %icmp +} |