diff options
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineCompares.cpp | 16 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/icmp.ll | 18 |
2 files changed, 32 insertions, 2 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp index 8cb4a59cba..e223a049f0 100644 --- a/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -2356,8 +2356,20 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) { // Try not to increase register pressure. BO0->hasOneUse() && BO1->hasOneUse()) { // 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; + } return new ICmpInst(Pred, Y, Z); } diff --git a/test/Transforms/InstCombine/icmp.ll b/test/Transforms/InstCombine/icmp.ll index eaff87d695..8e064a4f2f 100644 --- a/test/Transforms/InstCombine/icmp.ll +++ b/test/Transforms/InstCombine/icmp.ll @@ -659,3 +659,21 @@ define i1 @test64(i8 %a, i32 %b) nounwind { ; CHECK-NEXT: %c = icmp eq i8 %1, %a ; CHECK-NEXT: ret i1 %c } + +define i1 @test65(i64 %A, i64 %B) { + %s1 = add i64 %A, %B + %s2 = add i64 %A, %B + %cmp = icmp eq i64 %s1, %s2 +; CHECK: @test65 +; CHECK-NEXT: ret i1 true + ret i1 %cmp +} + +define i1 @test66(i64 %A, i64 %B) { + %s1 = add i64 %A, %B + %s2 = add i64 %B, %A + %cmp = icmp eq i64 %s1, %s2 +; CHECK: @test66 +; CHECK-NEXT: ret i1 true + ret i1 %cmp +} |