https://llvm.org/bugs/show_bug.cgi?id=31902
Bug ID: 31902
Summary: [btver2] Fix a crash in combineOrCmpEqZeroToCtlzSrl
under fast math
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: pierregoussea...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Example:
class C {
void foo(double*) const;
int h;
double y;
double x;
double z;
};
void C::foo(double *input) const {
int i;
double val;
double val1 = -1;
double val2 = z;
while (x >= 0 && i < h) {
if (!y) {
if (input[0] != 0 && val1 < val2) {
} else {
i++;
val = val2;
}
if (val) {
}
}
}
}
> clang -ffast-math -march=btver2 -O2 -S
This crashes with the following assertion:
Assertion failed: isa<X>(Val) && "cast<Ty>() argument of incompatible type!"
The problem is caused when isSetCCCandidate is operating on a X86ISD::CMP node
where operands are floating points.
I have a fix for this issue which I plan to send for review.
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