diff options
| author | Sanjay Patel <spatel@rotateright.com> | 2017-04-28 23:14:33 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2017-04-28 23:14:33 +0000 |
| commit | c8ab6bb27d13ce791cf5efccd12d385dda5f9e46 (patch) | |
| tree | 8287b85a44d3f11add4e0390cba2ecc61b4eabcd /llvm | |
| parent | 513dc805eb3aa278cde0c37643ff747311d30a15 (diff) | |
| download | bcm5719-llvm-c8ab6bb27d13ce791cf5efccd12d385dda5f9e46.tar.gz bcm5719-llvm-c8ab6bb27d13ce791cf5efccd12d385dda5f9e46.zip | |
[InstCombine] add tests to show potentially bogus application of DeMorgan (NFC)
llvm-svn: 301714
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/and-or.ll | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/and-or.ll b/llvm/test/Transforms/InstCombine/and-or.ll index 2ad90ad98e7..ce8c7664744 100644 --- a/llvm/test/Transforms/InstCombine/and-or.ll +++ b/llvm/test/Transforms/InstCombine/and-or.ll @@ -53,3 +53,25 @@ define i32 @func4(i32 %a, i32 %b) { ret i32 %tmp3 } +define i32 @demorganize_constant1(i32 %a) { +; CHECK-LABEL: @demorganize_constant1( +; CHECK-NEXT: [[A_NOT:%.*]] = or i32 %a, -16 +; CHECK-NEXT: [[AND1:%.*]] = xor i32 [[A_NOT]], 15 +; CHECK-NEXT: ret i32 [[AND1]] +; + %and = and i32 %a, 15 + %and1 = xor i32 %and, -1 + ret i32 %and1 +} + +define i32 @demorganize_constant2(i32 %a) { +; CHECK-LABEL: @demorganize_constant2( +; CHECK-NEXT: [[A_NOT:%.*]] = and i32 %a, -16 +; CHECK-NEXT: [[AND1:%.*]] = xor i32 [[A_NOT]], -16 +; CHECK-NEXT: ret i32 [[AND1]] +; + %and = or i32 %a, 15 + %and1 = xor i32 %and, -1 + ret i32 %and1 +} + |
