http://llvm.org/bugs/show_bug.cgi?id=9756
Summary: X86GenDAGISel.inc has code that depends on char
signedness
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
This is a snippet from CheckNodePredicate in X86GenDAGISel.inc:
case 8: { // Predicate_i16immSExt8
int64_t Imm = cast<ConstantSDNode>(Node)->getSExtValue();
return Imm == (char)Imm;
}
case 9: { // Predicate_i32immSExt8
int64_t Imm = cast<ConstantSDNode>(Node)->getSExtValue();
return Imm == (char)Imm;
}
case 10: { // Predicate_i64immSExt8
int64_t Imm = cast<ConstantSDNode>(Node)->getSExtValue();
return Imm == (char)Imm;
}
Depending on whether char is signed or unsigned, a value of -1 in Imm may cause
the function to return true or false. That is, -funsigned-char / -fsigned-char
changes the behaviour of LLVM here.
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