https://bugs.llvm.org/show_bug.cgi?id=39078
Bug ID: 39078
Summary: combineUIntToFP - UINT_TO_FP(vXi1) handling
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org
X86's UINT_TO_FP combine for bool vectors has a comment:
// UINT_TO_FP(vXi1) -> SINT_TO_FP(SEXT(vXi1 to vXi32))
// UINT_TO_FP(vXi8) -> SINT_TO_FP(ZEXT(vXi8 to vXi32))
// UINT_TO_FP(vXi16) -> SINT_TO_FP(ZEXT(vXi16 to vXi32))
But always zero-extends the source:
SDValue P = DAG.getNode(ISD::ZERO_EXTEND, dl, DstVT, Op0);
return DAG.getNode(ISD::SINT_TO_FP, dl, VT, P);
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