http://llvm.org/bugs/show_bug.cgi?id=8469
Summary: optimizer InstCombineCompares problem with optimizing
vector ICmpInst
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Here is a command line and error message; test case is attached.
Problem also exists in trunk, though I am not using trunk here.
>opt -O1 vectorIcmp.bc -o output.bc
IC: Visiting: %cmp = icmp ult <4 x i32> %tmp11, <i32 4, i32 4, i32 4, i32 4>
; <<4 x i1>> [#uses=1]
Assertion failed: New->getType() == getType() && "replaceAllUses of value with
n
ew value of different type!", file ..\..\..\compiler\llvm\lib\VMCore\Value.cpp,
line 317
The optimizer is trying to replace a vector of boolean with a simple boolean
value as in code:
Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
...
case ICmpInst::ICMP_ULT:
if (Op0Max.ult(Op1Min)) // A <u B -> true if max(A) < min(B)
return ReplaceInstUsesWith(I, ConstantInt::getTrue(I.getContext()));
There are other similar problems in this routine as well.
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