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add a few trivial instcombines for llvm.powi.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92383 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -10140,6 +10140,20 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
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if (Operand->getIntrinsicID() == Intrinsic::bswap)
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return ReplaceInstUsesWith(CI, Operand->getOperand(1));
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break;
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case Intrinsic::powi:
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if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getOperand(2))) {
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// powi(x, 0) -> 1.0
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if (Power->isZero())
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return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0));
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// powi(x, 1) -> x
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if (Power->isOne())
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return ReplaceInstUsesWith(CI, II->getOperand(1));
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// powi(x, -1) -> 1/x
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return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0),
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II->getOperand(1));
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}
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break;
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case Intrinsic::uadd_with_overflow: {
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Value *LHS = II->getOperand(1), *RHS = II->getOperand(2);
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const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());
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@ -4,6 +4,7 @@
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declare %overflow.result @llvm.uadd.with.overflow.i8(i8, i8)
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declare %overflow.result @llvm.umul.with.overflow.i8(i8, i8)
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declare double @llvm.powi.f64(double, i32) nounwind readonly
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define i8 @test1(i8 %A, i8 %B) {
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%x = call %overflow.result @llvm.uadd.with.overflow.i8(i8 %A, i8 %B)
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@ -77,3 +78,24 @@ define i8 @test6(i8 %A, i1* %overflowPtr) {
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; CHECK-NEXT: store i1 false, i1* %overflowPtr
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; CHECK-NEXT: ret i8 %A
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}
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define void @powi(double %V, double *%P) {
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entry:
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%A = tail call double @llvm.powi.f64(double %V, i32 -1) nounwind
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volatile store double %A, double* %P
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%B = tail call double @llvm.powi.f64(double %V, i32 0) nounwind
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volatile store double %B, double* %P
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%C = tail call double @llvm.powi.f64(double %V, i32 1) nounwind
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volatile store double %C, double* %P
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ret void
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; CHECK: @powi
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; CHECK: %A = fdiv double 1.0{{.*}}, %V
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; CHECK: volatile store double %A,
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; CHECK: volatile store double 1.0
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; CHECK: volatile store double %V
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}
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