diff options
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 | ||||
| -rw-r--r-- | llvm/test/CodeGen/R600/fmul.ll | 16 |
2 files changed, 18 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 0619c945fd2..d5b2f3658bc 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -8781,7 +8781,8 @@ SDValue DAGCombiner::visitFNEG(SDNode *N) { } // (fneg (fmul c, x)) -> (fmul -c, x) - if (N0.getOpcode() == ISD::FMUL) { + if (N0.getOpcode() == ISD::FMUL && + (N0.getNode()->hasOneUse() || !TLI.isFNegFree(VT))) { ConstantFPSDNode *CFP1 = dyn_cast<ConstantFPSDNode>(N0.getOperand(1)); if (CFP1) { APFloat CVal = CFP1->getValueAPF(); diff --git a/llvm/test/CodeGen/R600/fmul.ll b/llvm/test/CodeGen/R600/fmul.ll index 68ebc4dedfe..addc409c9eb 100644 --- a/llvm/test/CodeGen/R600/fmul.ll +++ b/llvm/test/CodeGen/R600/fmul.ll @@ -73,4 +73,20 @@ define void @test_mul_2_k_inv(float addrspace(1)* %out, float %x) #0 { ret void } +; There should be three multiplies here; %a should be used twice (once +; negated), not duplicated into mul x, 5.0 and mul x, -5.0. +; FUNC-LABEL: {{^}}test_mul_twouse: +; SI: v_mul_f32 +; SI: v_mul_f32 +; SI: v_mul_f32 +; SI-NOT: v_mul_f32 +define void @test_mul_twouse(float addrspace(1)* %out, float %x, float %y) #0 { + %a = fmul float %x, 5.0 + %b = fsub float -0.0, %a + %c = fmul float %b, %y + %d = fmul float %c, %a + store float %d, float addrspace(1)* %out + ret void +} + attributes #0 = { "less-precise-fpmad"="true" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "unsafe-fp-math"="true" } |
