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| author | David Majnemer <david.majnemer@gmail.com> | 2013-07-09 18:11:10 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2013-07-09 18:11:10 +0000 |
| commit | a92b3c914ebb356aec22c978eae9fa9543fa62e6 (patch) | |
| tree | af6fcc230e71b72de881bf2ec0832280ca442715 /llvm/test/Transforms | |
| parent | 861bef7dd05cb15ce1c0237e55798ea94bfb9b97 (diff) | |
| download | bcm5719-llvm-a92b3c914ebb356aec22c978eae9fa9543fa62e6.tar.gz bcm5719-llvm-a92b3c914ebb356aec22c978eae9fa9543fa62e6.zip | |
ValueTracking: Fix bugs in isKnownToBeAPowerOfTwo
(add nsw x, (and x, y)) isn't a power of two if x is zero, it's zero
(add nsw x, (xor x, y)) isn't a power of two if y has bits set that aren't set in x
llvm-svn: 185954
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/rem.ll | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/llvm/test/Transforms/InstCombine/rem.ll b/llvm/test/Transforms/InstCombine/rem.ll index 2b49385b922..808d51eba1d 100644 --- a/llvm/test/Transforms/InstCombine/rem.ll +++ b/llvm/test/Transforms/InstCombine/rem.ll @@ -163,18 +163,3 @@ define i32 @test16(i32 %x, i32 %y) { %rem = urem i32 %x, %add ret i32 %rem } - -define i32 @test17(i16 %x, i32 %y) { -; CHECK: @test17 -; CHECK-NEXT: [[AND:%.*]] = and i16 %x, 4 -; CHECK-NEXT: [[EXT:%.*]] = zext i16 [[AND]] to i32 -; CHECK-NEXT: [[SHL:%.*]] = shl nuw nsw i32 [[EXT]], 3 -; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[SHL]], 63 -; CHECK-NEXT: [[REM:%.*]] = and i32 [[XOR]], %y -; CHECK-NEXT: ret i32 [[REM]] - %1 = and i16 %x, 4 - %2 = icmp ne i16 %1, 0 - %3 = select i1 %2, i32 32, i32 64 - %4 = urem i32 %y, %3 - ret i32 %4 -} |
