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Provide InstCombines for the following 3 cases:
A * (1 - (uitofp i1 C)) -> select C, 0, A B * (uitofp i1 C) -> select C, B, 0 select C, 0, A + select C, B, 0 -> select C, B, A These come up in code that has been hand-optimized from a select to a linear blend, on platforms where that may have mattered. We want to undo such changes with the following transform: A*(1 - uitofp i1 C) + B*(uitofp i1 C) -> select C, A, B git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181216 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -693,6 +693,12 @@ m_ZExt(const OpTy &Op) {
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return CastClass_match<OpTy, Instruction::ZExt>(Op);
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}
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/// m_UIToFP
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template<typename OpTy>
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inline CastClass_match<OpTy, Instruction::UIToFP>
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m_UIToFp(const OpTy &Op) {
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return CastClass_match<OpTy, Instruction::UIToFP>(Op);
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}
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//===----------------------------------------------------------------------===//
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// Matchers for unary operators
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@ -1232,6 +1232,31 @@ Instruction *InstCombiner::visitFAdd(BinaryOperator &I) {
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}
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}
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// select C, 0, B + select C, A, 0 -> select C, A, B
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{
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Value *A1, *B1, *C1, *A2, *B2, *C2;
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if (match(LHS, m_Select(m_Value(C1), m_Value(A1), m_Value(B1))) &&
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match(RHS, m_Select(m_Value(C2), m_Value(A2), m_Value(B2)))) {
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if (C1 == C2) {
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Constant *Z1=0, *Z2=0;
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Value *A, *B, *C=C1;
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if (match(A1, m_AnyZero()) && match(B2, m_AnyZero())) {
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Z1 = dyn_cast<Constant>(A1); A = A2;
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Z2 = dyn_cast<Constant>(B2); B = B1;
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} else if (match(B1, m_AnyZero()) && match(A2, m_AnyZero())) {
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Z1 = dyn_cast<Constant>(B1); B = B2;
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Z2 = dyn_cast<Constant>(A2); A = A1;
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}
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if (Z1 && Z2 &&
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(I.hasNoSignedZeros() ||
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(Z1->isNegativeZeroValue() && Z2->isNegativeZeroValue()))) {
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return SelectInst::Create(C, A, B);
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}
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}
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}
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}
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if (I.hasUnsafeAlgebra()) {
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if (Value *V = FAddCombine(Builder).simplify(&I))
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return ReplaceInstUsesWith(I, V);
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@ -524,6 +524,34 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
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}
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}
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// B * (uitofp i1 C) -> select C, B, 0
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if(I.hasNoNaNs() && I.hasNoInfs() && I.hasNoSignedZeros()) {
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Value *LHS=Op0, *RHS=Op1;
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Value *B, *C;
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if (!match(RHS, m_UIToFp(m_Value(C))))
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std::swap(LHS, RHS);
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if (match(RHS, m_UIToFp(m_Value(C)))) {
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B=LHS;
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Value *Zero = ConstantFP::getNegativeZero(B->getType());
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return SelectInst::Create(C, B, Zero);
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}
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}
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// A * (1 - uitofp i1 C) -> select C, 0, A
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if(I.hasNoNaNs() && I.hasNoInfs() && I.hasNoSignedZeros()) {
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Value *LHS=Op0, *RHS=Op1;
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Value *A, *C;
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if (!match(RHS, m_FSub(m_FPOne(), m_UIToFp(m_Value(C)))))
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std::swap(LHS, RHS);
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if (match(RHS, m_FSub(m_FPOne(), m_UIToFp(m_Value(C))))) {
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A=LHS;
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Value *Zero = ConstantFP::getNegativeZero(A->getType());
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return SelectInst::Create(C, Zero, A);
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}
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}
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if (!isa<Constant>(Op1))
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std::swap(Opnd0, Opnd1);
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else
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34
test/Transforms/InstCombine/add4.ll
Normal file
34
test/Transforms/InstCombine/add4.ll
Normal file
@ -0,0 +1,34 @@
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; RUN: opt < %s -instcombine -S | grep inttoptr | count 2
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;; Target triple for gep raising case below.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i686-apple-darwin8"
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define float @test1(float %A, float %B, i1 %C) {
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EntryBlock:
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;; A*(1 - uitofp i1 C) -> select C, 0, A
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%cf = uitofp i1 %C to float
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%mc = fsub float 1.000000e+00, %cf
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%p1 = fmul fast float %A, %mc
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ret float %p1
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}
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define float @test2(float %A, float %B, i1 %C) {
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EntryBlock:
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;; B*(uitofp i1 C) -> select C, B, 0
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%cf = uitofp i1 %C to float
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%p2 = fmul fast float %B, %cf
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ret float %p2
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}
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define float @test3(float %A, float %B, i1 %C) {
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EntryBlock:
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;; A*(1 - uitofp i1 C) + B*(uitofp i1 C) -> select C, A, B
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%cf = uitofp i1 %C to float
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%mc = fsub float 1.000000e+00, %cf
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%p1 = fmul fast float %A, %mc
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%p2 = fmul fast float %B, %cf
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%s1 = fadd fast float %p1, %p2
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ret float %s1
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}
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