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Provide InstCombines for the following 3 cases:

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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
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@@ -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