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author | Duncan Sands <baldrick@free.fr> | 2012-11-16 19:41:26 +0000 |
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committer | Duncan Sands <baldrick@free.fr> | 2012-11-16 19:41:26 +0000 |
commit | aceb03eb58778ae4a2811d2c2bbd23e0e0cf49b5 (patch) | |
tree | dfc44a22b8c4216b049a15b9f107bf33215d5d4c | |
parent | 48f63be3684213e16fb657e9bb8c37ae02788e90 (diff) | |
download | llvm-aceb03eb58778ae4a2811d2c2bbd23e0e0cf49b5.tar.gz llvm-aceb03eb58778ae4a2811d2c2bbd23e0e0cf49b5.tar.bz2 llvm-aceb03eb58778ae4a2811d2c2bbd23e0e0cf49b5.tar.xz |
InstructionSimplify should be able to simplify A+B==B+A to 'true'
but wasn't due to the same logic bug that caused PR14361.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168186 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 16 | ||||
-rw-r--r-- | test/Transforms/InstSimplify/compare.ll | 9 |
2 files changed, 23 insertions, 2 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index b3d62487fc..c24c18f807 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -2065,8 +2065,20 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS, if (A && C && (A == C || A == D || B == C || B == D) && NoLHSWrapProblem && NoRHSWrapProblem) { // Determine Y and Z in the form icmp (X+Y), (X+Z). - Value *Y = (A == C || A == D) ? B : A; - Value *Z = (C == A || C == B) ? D : C; + Value *Y, *Z; + if (A == C) { + Y = B; + Z = D; + } else if (A == D) { + Y = B; + Z = C; + } else if (B == C) { + Y = A; + Z = D; + } else if (B == D) { + Y = A; + Z = C; + } if (Value *V = SimplifyICmpInst(Pred, Y, Z, Q, MaxRecurse-1)) return V; } diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll index ced74bd4be..ce2bb799c8 100644 --- a/test/Transforms/InstSimplify/compare.ll +++ b/test/Transforms/InstSimplify/compare.ll @@ -266,6 +266,15 @@ define i1 @add5(i32 %x, i32 %y) { ; CHECK: ret i1 true } +define i1 @add6(i64 %A, i64 %B) { +; CHECK: @add6 + %s1 = add i64 %A, %B + %s2 = add i64 %B, %A + %cmp = icmp eq i64 %s1, %s2 + ret i1 %cmp +; CHECK: ret i1 true +} + define i1 @addpowtwo(i32 %x, i32 %y) { ; CHECK: @addpowtwo %l = lshr i32 %x, 1 |