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add a few trivial instcombines for llvm.powi.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92383 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-01 01:52:15 +00:00
parent 398ffba75f
commit d27f911b23
2 changed files with 36 additions and 0 deletions
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14
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -10140,6 +10140,20 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
if (Operand->getIntrinsicID() == Intrinsic::bswap)
return ReplaceInstUsesWith(CI, Operand->getOperand(1));
break;
case Intrinsic::powi:
if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getOperand(2))) {
// powi(x, 0) -> 1.0
if (Power->isZero())
return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0));
// powi(x, 1) -> x
if (Power->isOne())
return ReplaceInstUsesWith(CI, II->getOperand(1));
// powi(x, -1) -> 1/x
return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0),
II->getOperand(1));
}
break;
case Intrinsic::uadd_with_overflow: {
Value *LHS = II->getOperand(1), *RHS = II->getOperand(2);
const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());

22
test/Transforms/InstCombine/intrinsics.ll
View File

@ -4,6 +4,7 @@
declare %overflow.result @llvm.uadd.with.overflow.i8(i8, i8)
declare %overflow.result @llvm.umul.with.overflow.i8(i8, i8)
declare double @llvm.powi.f64(double, i32) nounwind readonly
define i8 @test1(i8 %A, i8 %B) {
%x = call %overflow.result @llvm.uadd.with.overflow.i8(i8 %A, i8 %B)
@ -77,3 +78,24 @@ define i8 @test6(i8 %A, i1* %overflowPtr) {
; CHECK-NEXT: store i1 false, i1* %overflowPtr
; CHECK-NEXT: ret i8 %A
}
define void @powi(double %V, double *%P) {
entry:
%A = tail call double @llvm.powi.f64(double %V, i32 -1) nounwind
volatile store double %A, double* %P
%B = tail call double @llvm.powi.f64(double %V, i32 0) nounwind
volatile store double %B, double* %P
%C = tail call double @llvm.powi.f64(double %V, i32 1) nounwind
volatile store double %C, double* %P
ret void
; CHECK: @powi
; CHECK: %A = fdiv double 1.0{{.*}}, %V
; CHECK: volatile store double %A,
; CHECK: volatile store double 1.0
; CHECK: volatile store double %V
}