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[SimplifyLibCalls] Only consider sinpi/cospi functions within the same function

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The sinpi/cospi can be replaced with sincospi to remove unnecessary
computations.  However, we need to make sure that the calls are within
the same function!

This fixes PR26993.

llvm-svn: 263875
This commit is contained in:
David Majnemer 2016-03-19 04:53:02 +00:00
parent 2669789037
commit ab6aef2bdd
3 changed files with 36 additions and 8 deletions
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2
include/llvm/Transforms/Utils/SimplifyLibCalls.h
View File

@ -154,7 +154,7 @@ private:
// Helper methods
Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B);
void classifyArgUse(Value *Val, BasicBlock *BB, bool IsFloat,
void classifyArgUse(Value *Val, Function *F, bool IsFloat,
SmallVectorImpl<CallInst *> &SinCalls,
SmallVectorImpl<CallInst *> &CosCalls,
SmallVectorImpl<CallInst *> &SinCosCalls);

12
lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -1625,9 +1625,9 @@ Value *LibCallSimplifier::optimizeSinCosPi(CallInst *CI, IRBuilder<> &B) {
// Look for all compatible sinpi, cospi and sincospi calls with the same
// argument. If there are enough (in some sense) we can make the
// substitution.
Function *F = CI->getFunction();
for (User *U : Arg->users())
classifyArgUse(U, CI->getParent(), IsFloat, SinCalls, CosCalls,
SinCosCalls);
classifyArgUse(U, F, IsFloat, SinCalls, CosCalls, SinCosCalls);
// It's only worthwhile if both sinpi and cospi are actually used.
if (SinCosCalls.empty() && (SinCalls.empty() || CosCalls.empty()))
@ -1643,8 +1643,8 @@ Value *LibCallSimplifier::optimizeSinCosPi(CallInst *CI, IRBuilder<> &B) {
return nullptr;
}
void
LibCallSimplifier::classifyArgUse(Value *Val, BasicBlock *BB, bool IsFloat,
void LibCallSimplifier::classifyArgUse(
Value *Val, Function *F, bool IsFloat,
SmallVectorImpl<CallInst *> &SinCalls,
SmallVectorImpl<CallInst *> &CosCalls,
SmallVectorImpl<CallInst *> &SinCosCalls) {
@ -1653,6 +1653,10 @@ LibCallSimplifier::classifyArgUse(Value *Val, BasicBlock *BB, bool IsFloat,
if (!CI)
return;
// Don't consider calls in other functions.
if (CI->getFunction() != F)
return;
Function *Callee = CI->getCalledFunction();
LibFunc::Func Func;
if (!Callee || !TLI->getLibFunc(Callee->getName(), Func) || !TLI->has(Func) ||

24
test/Transforms/InstCombine/pr26993.ll Normal file
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@ -0,0 +1,24 @@
; RUN: opt -instcombine -S < %s | FileCheck %s
define double @test1() {
%sin = call double @__sinpi(double 1.0)
ret double %sin
}
; CHECK-LABEL: define double @test1(
; CHECK: %[[sin:.*]] = call double @__sinpi(double 1.000000e+00)
; CHECK-NEXT: ret double %[[sin]]
define double @test2() {
%cos = call double @__cospi(double 1.0)
ret double %cos
}
; CHECK-LABEL: define double @test2(
; CHECK: %[[cos:.*]] = call double @__cospi(double 1.000000e+00)
; CHECK-NEXT: ret double %[[cos]]
declare double @__sinpi(double %x) #0
declare double @__cospi(double %x) #0
attributes #0 = { readnone nounwind }