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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2010-11-23 20:33:57 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2010-11-23 20:33:57 +0000 |
| commit | c21a821e9f044004bc504dd7bfdfaecb9d4af16b (patch) | |
| tree | e01a80c5fdfbe1e0a146ff48666d071091f90c62 /test/Transforms/InstCombine/shift.ll | |
| parent | b6133d148312a3ec15beb67c2f49a21e5082b666 (diff) | |
| download | llvm-c21a821e9f044004bc504dd7bfdfaecb9d4af16b.tar.gz llvm-c21a821e9f044004bc504dd7bfdfaecb9d4af16b.tar.bz2 llvm-c21a821e9f044004bc504dd7bfdfaecb9d4af16b.tar.xz | |
The srem -> urem transform is not safe for any divisor that's not a power of two.
E.g. -5 % 5 is 0 with srem and 1 with urem.
Also addresses Frits van Bommel's comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120049 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/shift.ll')
| -rw-r--r-- | test/Transforms/InstCombine/shift.ll | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/test/Transforms/InstCombine/shift.ll b/test/Transforms/InstCombine/shift.ll index 6bebca9cc8..8d1c82991f 100644 --- a/test/Transforms/InstCombine/shift.ll +++ b/test/Transforms/InstCombine/shift.ll @@ -443,12 +443,12 @@ entry: } define i32 @test38(i32 %x) nounwind readnone { -entry: %rem = srem i32 %x, 32 %shl = shl i32 1, %rem ret i32 %shl ; CHECK: @test38 -; CHECK-NOT: srem -; CHECK: ret i32 +; CHECK-NEXT: and i32 %x, 31 +; CHECK-NEXT: shl i32 1 +; CHECK-NEXT: ret i32 } |