From c8ab6bb27d13ce791cf5efccd12d385dda5f9e46 Mon Sep 17 00:00:00 2001 From: Sanjay Patel Date: Fri, 28 Apr 2017 23:14:33 +0000 Subject: [PATCH] [InstCombine] add tests to show potentially bogus application of DeMorgan (NFC) llvm-svn: 301714 --- llvm/test/Transforms/InstCombine/and-or.ll | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/llvm/test/Transforms/InstCombine/and-or.ll b/llvm/test/Transforms/InstCombine/and-or.ll index 2ad90ad..ce8c766 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 +} + -- 2.7.4