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Implement PR1822

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44318 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-11-25 21:27:53 +00:00
parent d91cbf352a
commit cfa597569d
2 changed files with 18 additions and 3 deletions
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7
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -7326,6 +7326,13 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
return BinaryOperator::createOr(NotCond, TrueVal);
}
}
// select a, b, a -> a&b
// select a, a, b -> a|b
if (CondVal == TrueVal)
return BinaryOperator::createOr(CondVal, FalseVal);
else if (CondVal == FalseVal)
return BinaryOperator::createAnd(CondVal, TrueVal);
}
// Selecting between two integer constants?

14
test/Transforms/InstCombine/select.ll
View File

@ -1,8 +1,7 @@
; This test makes sure that these instructions are properly eliminated.
; PR1822
; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | \
; RUN: not grep select
; END.
; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | not grep select
implementation
@ -180,3 +179,12 @@ short %test22(int %x) {
ret short %retval
}
bool %test23(bool %a, bool %b) {
%c = select bool %a, bool %b, bool %a
ret bool %c
}
bool %test24(bool %a, bool %b) {
%c = select bool %a, bool %a, bool %b
ret bool %c
}