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enhance the previous optimization to work with fcmp in addition

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to icmp.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92412 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-02 08:20:51 +00:00
parent 1f12e44b62
commit 34e0c76f93
2 changed files with 32 additions and 4 deletions
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25
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -6180,7 +6180,7 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) {
if (Instruction *NV = FoldFCmp_IntToFP_Cst(I, LHSI, RHSC))
return NV;
break;
case Instruction::Select:
case Instruction::Select: {
// If either operand of the select is a constant, we can fold the
// comparison into the select arms, which will cause one to be
// constant folded and the select turned into a bitwise or.
@ -6205,6 +6205,20 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) {
return SelectInst::Create(LHSI->getOperand(0), Op1, Op2);
break;
}
case Instruction::Load:
if (GetElementPtrInst *GEP =
dyn_cast<GetElementPtrInst>(LHSI->getOperand(0))) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(GEP->getOperand(0)))
if (GV->isConstant() && GV->hasDefinitiveInitializer() &&
!cast<LoadInst>(LHSI)->isVolatile())
if (Instruction *Res = FoldCmpLoadFromIndexedGlobal(GEP, GV, I))
return Res;
//errs() << "NOT HANDLED: " << *GV << "\n";
//errs() << "\t" << *GEP << "\n";
//errs() << "\t " << I << "\n\n\n";
}
break;
}
}
return Changed ? &I : 0;
@ -6586,13 +6600,16 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
case Instruction::Load:
if (GetElementPtrInst *GEP =
dyn_cast<GetElementPtrInst>(LHSI->getOperand(0)))
dyn_cast<GetElementPtrInst>(LHSI->getOperand(0))) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(GEP->getOperand(0)))
if (GV->isConstant() && GV->hasDefinitiveInitializer() &&
!cast<LoadInst>(LHSI)->isVolatile()) {
!cast<LoadInst>(LHSI)->isVolatile())
if (Instruction *Res = FoldCmpLoadFromIndexedGlobal(GEP, GV, I))
return Res;
}
//errs() << "NOT HANDLED: " << *GV << "\n";
//errs() << "\t" << *GEP << "\n";
//errs() << "\t " << I << "\n\n\n";
}
break;
}
}

11
test/Transforms/InstCombine/load-cmp.ll
View File

@ -2,6 +2,7 @@
@G16 = internal constant [10 x i16] [i16 35, i16 82, i16 69, i16 81, i16 85,
i16 73, i16 82, i16 69, i16 68, i16 0]
@GD = internal constant [3 x double] [double 1.0, double 4.0, double -20.0]
define i1 @test1(i32 %X) {
%P = getelementptr [10 x i16]* @G16, i32 0, i32 %X
@ -23,3 +24,13 @@ define i1 @test2(i32 %X) {
; CHECK-NEXT: ret i1 %R
}
define i1 @test3(i32 %X) {
%P = getelementptr [3 x double]* @GD, i32 0, i32 %X
%Q = load double* %P
%R = fcmp oeq double %Q, 1.0
ret i1 %R
; CHECK: @test3
; CHECK-NEXT: %R = icmp eq i32 %X, 0
; CHECK-NEXT: ret i1 %R
}