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Provide InstCombines for the following 3 cases:

Browse Source 
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
This commit is contained in:
Jean-Luc Duprat 2013-05-06 16:55:50 +00:00
parent 4c8850cd1c
commit c5cf6e5365
4 changed files with 93 additions and 0 deletions
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6
include/llvm/Support/PatternMatch.h
View File

@ -693,6 +693,12 @@ m_ZExt(const OpTy &Op) {
return CastClass_match<OpTy, Instruction::ZExt>(Op);
}
/// m_UIToFP
template<typename OpTy>
inline CastClass_match<OpTy, Instruction::UIToFP>
m_UIToFp(const OpTy &Op) {
return CastClass_match<OpTy, Instruction::UIToFP>(Op);
}
//===----------------------------------------------------------------------===//
// Matchers for unary operators

25
lib/Transforms/InstCombine/InstCombineAddSub.cpp
View File

@ -1232,6 +1232,31 @@ Instruction *InstCombiner::visitFAdd(BinaryOperator &I) {
}
}
// select C, 0, B + select C, A, 0 -> select C, A, B
{
Value *A1, *B1, *C1, *A2, *B2, *C2;
if (match(LHS, m_Select(m_Value(C1), m_Value(A1), m_Value(B1))) &&
match(RHS, m_Select(m_Value(C2), m_Value(A2), m_Value(B2)))) {
if (C1 == C2) {
Constant *Z1=0, *Z2=0;
Value *A, *B, *C=C1;
if (match(A1, m_AnyZero()) && match(B2, m_AnyZero())) {
Z1 = dyn_cast<Constant>(A1); A = A2;
Z2 = dyn_cast<Constant>(B2); B = B1;
} else if (match(B1, m_AnyZero()) && match(A2, m_AnyZero())) {
Z1 = dyn_cast<Constant>(B1); B = B2;
Z2 = dyn_cast<Constant>(A2); A = A1;
}
if (Z1 && Z2 &&
(I.hasNoSignedZeros() ||
(Z1->isNegativeZeroValue() && Z2->isNegativeZeroValue()))) {
return SelectInst::Create(C, A, B);
}
}
}
}
if (I.hasUnsafeAlgebra()) {
if (Value *V = FAddCombine(Builder).simplify(&I))
return ReplaceInstUsesWith(I, V);

28
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
View File

@ -524,6 +524,34 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
}
}
// B * (uitofp i1 C) -> select C, B, 0
if(I.hasNoNaNs() && I.hasNoInfs() && I.hasNoSignedZeros()) {
Value *LHS=Op0, *RHS=Op1;
Value *B, *C;
if (!match(RHS, m_UIToFp(m_Value(C))))
std::swap(LHS, RHS);
if (match(RHS, m_UIToFp(m_Value(C)))) {
B=LHS;
Value *Zero = ConstantFP::getNegativeZero(B->getType());
return SelectInst::Create(C, B, Zero);
}
}
// A * (1 - uitofp i1 C) -> select C, 0, A
if(I.hasNoNaNs() && I.hasNoInfs() && I.hasNoSignedZeros()) {
Value *LHS=Op0, *RHS=Op1;
Value *A, *C;
if (!match(RHS, m_FSub(m_FPOne(), m_UIToFp(m_Value(C)))))
std::swap(LHS, RHS);
if (match(RHS, m_FSub(m_FPOne(), m_UIToFp(m_Value(C))))) {
A=LHS;
Value *Zero = ConstantFP::getNegativeZero(A->getType());
return SelectInst::Create(C, Zero, A);
}
}
if (!isa<Constant>(Op1))
std::swap(Opnd0, Opnd1);
else

34
test/Transforms/InstCombine/add4.ll Normal file
View File

@ -0,0 +1,34 @@
; RUN: opt < %s -instcombine -S | grep inttoptr | count 2
;; Target triple for gep raising case below.
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"
target triple = "i686-apple-darwin8"
define float @test1(float %A, float %B, i1 %C) {
EntryBlock:
;; A*(1 - uitofp i1 C) -> select C, 0, A
%cf = uitofp i1 %C to float
%mc = fsub float 1.000000e+00, %cf
%p1 = fmul fast float %A, %mc
ret float %p1
}
define float @test2(float %A, float %B, i1 %C) {
EntryBlock:
;; B*(uitofp i1 C) -> select C, B, 0
%cf = uitofp i1 %C to float
%p2 = fmul fast float %B, %cf
ret float %p2
}
define float @test3(float %A, float %B, i1 %C) {
EntryBlock:
;; A*(1 - uitofp i1 C) + B*(uitofp i1 C) -> select C, A, B
%cf = uitofp i1 %C to float
%mc = fsub float 1.000000e+00, %cf
%p1 = fmul fast float %A, %mc
%p2 = fmul fast float %B, %cf
%s1 = fadd fast float %p1, %p2
ret float %s1
}