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[X86] Mark the FUCOMI instructions as requiring CMOV to be enabled. NFCI 

These instructions were added on the PentiumPro along with CMOV.

This was already comprehended by the lowering process which should emit an alternate sequence using FCOM and FNSTW. This just makes it an explicit error if that doesn't work for some reason.

llvm-svn: 340844
This commit is contained in:
Craig Topper 2018-08-28 17:17:13 +00:00
parent f0a1088afb
commit c73095e264
1 changed files with 3 additions and 0 deletions
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3
llvm/lib/Target/X86/X86InstrFPStack.td
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@ -592,10 +592,13 @@ def UCOM_Fpr80 : FpI_ <(outs), (ins RFP80:$lhs, RFP80:$rhs), CompareFP,
let SchedRW = [WriteFCom] in {
// CC = ST(0) cmp ST(i)
let Defs = [EFLAGS, FPSW] in {
let Predicates = [FPStackf32, HasCMov] in
def UCOM_FpIr32: FpIf32<(outs), (ins RFP32:$lhs, RFP32:$rhs), CompareFP,
[(set EFLAGS, (X86cmp RFP32:$lhs, RFP32:$rhs))]>;
let Predicates = [FPStackf64, HasCMov] in
def UCOM_FpIr64: FpIf64<(outs), (ins RFP64:$lhs, RFP64:$rhs), CompareFP,
[(set EFLAGS, (X86cmp RFP64:$lhs, RFP64:$rhs))]>;
let Predicates = [HasCMov] in
def UCOM_FpIr80: FpI_<(outs), (ins RFP80:$lhs, RFP80:$rhs), CompareFP,
[(set EFLAGS, (X86cmp RFP80:$lhs, RFP80:$rhs))]>;
}