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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-07-11 18:31:59 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-07-11 18:31:59 +0000 |
| commit | 597f2950d8dc263f2264501200e390a92ebfb356 (patch) | |
| tree | 54625d38ecc000a872f69a28236026883caa92df /test/CodeGen/X86/divide-by-constant.ll | |
| parent | 79137851bf22d2181b56d060abde4398f36fc59c (diff) | |
| download | llvm-597f2950d8dc263f2264501200e390a92ebfb356.tar.gz llvm-597f2950d8dc263f2264501200e390a92ebfb356.tar.bz2 llvm-597f2950d8dc263f2264501200e390a92ebfb356.tar.xz | |
PR13326: Fix a subtle edge case in the udiv -> magic multiply generator.
This caused 6 of 65k possible 8 bit udivs to be wrong.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160058 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/divide-by-constant.ll')
| -rw-r--r-- | test/CodeGen/X86/divide-by-constant.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/test/CodeGen/X86/divide-by-constant.ll b/test/CodeGen/X86/divide-by-constant.ll index e577ecb85a..8e7c13d8ef 100644 --- a/test/CodeGen/X86/divide-by-constant.ll +++ b/test/CodeGen/X86/divide-by-constant.ll @@ -71,3 +71,24 @@ define i32 @test7(i32 %x) nounwind { ; CHECK-NOT: shrl ; CHECK: ret } + +; PR13326 +define i8 @test8(i8 %x) nounwind { + %div = udiv i8 %x, 78 + ret i8 %div +; CHECK: test8: +; CHECK: shrb % +; CHECK: imull $211 +; CHECK: shrl $13 +; CHECK: ret +} + +define i8 @test9(i8 %x) nounwind { + %div = udiv i8 %x, 116 + ret i8 %div +; CHECK: test9: +; CHECK: shrb $2 +; CHECK: imull $71 +; CHECK: shrl $11 +; CHECK: ret +} |