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Fix PR1817.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44284 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-11-22 23:47:13 +00:00
parent c2bfadb9df
commit eec8b9a7d6
2 changed files with 22 additions and 1 deletions
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7
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -3463,7 +3463,12 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
LHSCC != ICmpInst::ICMP_UGE && LHSCC != ICmpInst::ICMP_ULE &&
RHSCC != ICmpInst::ICMP_UGE && RHSCC != ICmpInst::ICMP_ULE &&
LHSCC != ICmpInst::ICMP_SGE && LHSCC != ICmpInst::ICMP_SLE &&
RHSCC != ICmpInst::ICMP_SGE && RHSCC != ICmpInst::ICMP_SLE) {
RHSCC != ICmpInst::ICMP_SGE && RHSCC != ICmpInst::ICMP_SLE &&
// Don't try to fold ICMP_SLT + ICMP_ULT.
(ICmpInst::isEquality(LHSCC) || ICmpInst::isEquality(RHSCC) ||
ICmpInst::isSignedPredicate(LHSCC) ==
ICmpInst::isSignedPredicate(RHSCC))) {
// Ensure that the larger constant is on the RHS.
ICmpInst::Predicate GT = ICmpInst::isSignedPredicate(LHSCC) ?
ICmpInst::ICMP_SGT : ICmpInst::ICMP_UGT;

16
test/Transforms/InstCombine/2007-11-22-IcmpCrash.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llvm-as < %s | opt -instcombine -disable-output
; PR1817
define i1 @test1(i32 %X) {
%A = icmp slt i32 %X, 10
%B = icmp ult i32 %X, 10
%C = and i1 %A, %B
ret i1 %C
}
define i1 @test2(i32 %X) {
%A = icmp slt i32 %X, 10
%B = icmp ult i32 %X, 10
%C = or i1 %A, %B
ret i1 %C
}