diff options
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineCompares.cpp | 5 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/fcmp.ll | 9 |
2 files changed, 14 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp index 6743885cd4..cb434bda57 100644 --- a/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -2855,6 +2855,11 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) { } } + // fcmp (fneg x), (fneg y) -> fcmp x, y + Value *X, *Y; + if (match(Op0, m_FNeg(m_Value(X))) && match(Op1, m_FNeg(m_Value(Y)))) + return new FCmpInst(I.getPredicate(), X, Y); + // fcmp (fpext x), (fpext y) -> fcmp x, y if (FPExtInst *LHSExt = dyn_cast<FPExtInst>(Op0)) if (FPExtInst *RHSExt = dyn_cast<FPExtInst>(Op1)) diff --git a/test/Transforms/InstCombine/fcmp.ll b/test/Transforms/InstCombine/fcmp.ll index f869a18992..66607ea001 100644 --- a/test/Transforms/InstCombine/fcmp.ll +++ b/test/Transforms/InstCombine/fcmp.ll @@ -40,3 +40,12 @@ define i1 @test5(float %a) nounwind { ; CHECK: @test5 ; CHECK-NEXT: fcmp olt float %a, -1.0 } + +define i1 @test6(float %x, float %y) nounwind { + %neg1 = fsub float -0.000000e+00, %x + %neg2 = fsub float -0.000000e+00, %y + %cmp = fcmp ogt float %neg1, %neg2 + ret i1 %cmp +; CHECK: @test6 +; CHECK-NEXT: fcmp ogt float %x, %y +} |