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[SCCP] Add UnaryOperator visitor to SCCP for unary FNeg

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Differential Revision: https://reviews.llvm.org/D62819

llvm-svn: 362449
This commit is contained in:
Cameron McInally 2019-06-03 21:53:56 +00:00
parent 6e02c037bc
commit 036ac9d0e5
3 changed files with 67 additions and 0 deletions
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26
lib/Transforms/Scalar/SCCP.cpp
View File

@ -613,6 +613,7 @@ private:
void visitCastInst(CastInst &I);
void visitSelectInst(SelectInst &I);
void visitUnaryOperator(Instruction &I);
void visitBinaryOperator(Instruction &I);
void visitCmpInst(CmpInst &I);
void visitExtractValueInst(ExtractValueInst &EVI);
@ -969,6 +970,29 @@ void SCCPSolver::visitSelectInst(SelectInst &I) {
markOverdefined(&I);
}
// Handle Unary Operators.
void SCCPSolver::visitUnaryOperator(Instruction &I) {
LatticeVal V0State = getValueState(I.getOperand(0));
LatticeVal &IV = ValueState[&I];
if (IV.isOverdefined()) return;
if (V0State.isConstant()) {
Constant *C = ConstantExpr::get(I.getOpcode(), V0State.getConstant());
// op Y -> undef.
if (isa<UndefValue>(C))
return;
return (void)markConstant(IV, &I, C);
}
// If something is undef, wait for it to resolve.
if (!V0State.isOverdefined())
return;
markOverdefined(&I);
}
// Handle Binary Operators.
void SCCPSolver::visitBinaryOperator(Instruction &I) {
LatticeVal V1State = getValueState(I.getOperand(0));
@ -1484,6 +1508,8 @@ bool SCCPSolver::ResolvedUndefsIn(Function &F) {
else
markOverdefined(&I);
return true;
case Instruction::FNeg:
break; // fneg undef -> undef
case Instruction::ZExt:
case Instruction::SExt:
case Instruction::FPToUI:

33
test/Transforms/SCCP/apfloat-basictest.ll Normal file
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@ -0,0 +1,33 @@
; This is a basic sanity check for constant propagation. The fneg instruction
; should be eliminated.
; RUN: opt < %s -sccp -S | FileCheck %s
define double @test(i1 %B) {
br i1 %B, label %BB1, label %BB2
BB1:
%Val = fneg double 42.0
br label %BB3
BB2:
br label %BB3
BB3:
%Ret = phi double [%Val, %BB1], [1.0, %BB2]
ret double %Ret
; CHECK-LABEL: @test(
; CHECK: [[PHI:%.*]] = phi double [ -4.200000e+01, %BB1 ], [ 1.000000e+00, %BB2 ]
}
define double @test1(i1 %B) {
br i1 %B, label %BB1, label %BB2
BB1:
%Div = fdiv double 1.0, 1.0
%Val = fneg double %Div
br label %BB3
BB2:
br label %BB3
BB3:
%Ret = phi double [%Val, %BB1], [1.0, %BB2]
ret double %Ret
; CHECK-LABEL: @test1(
; CHECK: [[PHI:%.*]] = phi double [ -1.000000e+00, %BB1 ], [ 1.000000e+00, %BB2 ]
}

8
test/Transforms/SCCP/undef-resolve.ll
View File

@ -180,3 +180,11 @@ entry:
; CHECK-LABEL: @test11(
; CHECK: ret i32 0
}
; Test unary ops
define double @test12(double %x) {
%t = fneg double undef
ret double %t
; CHECK-LABEL: @test12(
; CHECK: double undef
}