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Handle the case where there is no "not". It is possible it got

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folded into the select.

llvm-svn: 59389
This commit is contained in:
Chris Lattner 2008-11-16 04:25:26 +00:00
parent 6afddeeed1
commit 21f18c9760
2 changed files with 16 additions and 1 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4222,9 +4222,13 @@ static Instruction *MatchSelectFromAndOr(Value *A, Value *B,
// Handle "cond ? -1 : 0".
if (C1->isAllOnesValue() && C2->isZero()) {
// ((cond?-1:0)&C) | (B&(cond?0:-1)) -> cond ? C : B.
if (match(D, SELECT_MATCH(Cond2, 0, -1)) && Cond2 == Cond)
return SelectInst::Create(Cond, C, B);
if (match(D, m_Not(SELECT_MATCH(Cond2, -1, 0))) && Cond2 == Cond)
return SelectInst::Create(Cond, C, B);
// ((cond?-1:0)&C) | ((cond?0:-1)&D) -> cond ? C : D.
if (match(B, SELECT_MATCH(Cond2, 0, -1)) && Cond2 == Cond)
return SelectInst::Create(Cond, C, D);
if (match(B, m_Not(SELECT_MATCH(Cond2, -1, 0))) && Cond2 == Cond)
return SelectInst::Create(Cond, C, D);
}

13
test/Transforms/InstCombine/logical-select.ll
View File

@ -1,5 +1,5 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
; RUN: grep select %t | count 4
; RUN: grep select %t | count 5
; RUN: not grep and %t
; RUN: not grep or %t
@ -31,6 +31,17 @@ entry:
%3 = or i32 %1, %2
ret i32 %3
}
define i32 @poo(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
entry:
%0 = icmp slt i32 %a, %b
%iftmp.0.0 = select i1 %0, i32 -1, i32 0
%1 = and i32 %iftmp.0.0, %c
%iftmp = select i1 %0, i32 0, i32 -1
%2 = and i32 %iftmp, %d
%3 = or i32 %1, %2
ret i32 %3
}
define i32 @par(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
entry:
%0 = icmp slt i32 %a, %b