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| author | Chad Rosier <mcrosier@apple.com> | 2012-03-22 00:21:17 +0000 |
|---|---|---|
| committer | Chad Rosier <mcrosier@apple.com> | 2012-03-22 00:21:17 +0000 |
| commit | 544b9b426f0dfa1beef6dc3640607dee3ca1160e (patch) | |
| tree | 72e4f0b64ca11a3a78633db46c6d1f94c61445b9 /test | |
| parent | 55f43d6b7e3ad1f08f5392205ab0feabf4c9933d (diff) | |
| download | llvm-544b9b426f0dfa1beef6dc3640607dee3ca1160e.tar.gz | |
[fast-isel] Fold "urem x, pow2" -> "and x, pow2-1". This should fix the 271%
execution-time regression for nsieve-bits on the ARMv7 -O0 -g nightly tester.
This may also improve compile-time on architectures that would otherwise
generate a libcall for urem (e.g., ARM) or fall back to the DAG selector.
rdar://10810716
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153230 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/ARM/fast-isel.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/fast-isel.ll b/test/CodeGen/ARM/fast-isel.ll index 905543a54cf5..417e2d9e410a 100644 --- a/test/CodeGen/ARM/fast-isel.ll +++ b/test/CodeGen/ARM/fast-isel.ll @@ -217,3 +217,12 @@ entry: ; THUMB: vcmpe.f32 s0, #0 ret i1 %4 } + +; ARM: @urem_fold +; THUMB: @urem_fold +; ARM: and r0, r0, #31 +; THUMB: and r0, r0, #31 +define i32 @urem_fold(i32 %a) nounwind { + %rem = urem i32 %a, 32 + ret i32 %rem +} |