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Convert comparisons like (x == infinity) to (x >= infinity) on targets

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where FCMP_OEQ is not legal and FCMP_OGE is, such as x86. 

llvm-svn: 82861
This commit is contained in:
Dan Gohman 2009-09-26 15:24:17 +00:00
parent 64511993cb
commit 6899a1cd58
2 changed files with 113 additions and 0 deletions
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37
lib/CodeGen/SelectionDAG/TargetLowering.cpp
View File

@ -1922,6 +1922,43 @@ TargetLowering::SimplifySetCC(EVT VT, SDValue N0, SDValue N1,
// materialize 0.0.
if (Cond == ISD::SETO || Cond == ISD::SETUO)
return DAG.getSetCC(dl, VT, N0, N0, Cond);
// If the condition is not legal, see if we can find an equivalent one
// which is legal.
if (!isCondCodeLegal(Cond, N0.getValueType())) {
// If the comparison was an awkward floating-point == or != and one of
// the comparison operands is infinity or negative infinity, convert the
// condition to a less-awkward <= or >=.
if (CFP->getValueAPF().isInfinity()) {
if (CFP->getValueAPF().isNegative()) {
if (Cond == ISD::SETOEQ &&
isCondCodeLegal(ISD::SETOLE, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOLE);
if (Cond == ISD::SETUEQ &&
isCondCodeLegal(ISD::SETOLE, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETULE);
if (Cond == ISD::SETUNE &&
isCondCodeLegal(ISD::SETUGT, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETUGT);
if (Cond == ISD::SETONE &&
isCondCodeLegal(ISD::SETUGT, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOGT);
} else {
if (Cond == ISD::SETOEQ &&
isCondCodeLegal(ISD::SETOGE, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOGE);
if (Cond == ISD::SETUEQ &&
isCondCodeLegal(ISD::SETOGE, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETUGE);
if (Cond == ISD::SETUNE &&
isCondCodeLegal(ISD::SETULT, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETULT);
if (Cond == ISD::SETONE &&
isCondCodeLegal(ISD::SETULT, N0.getValueType()))
return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOLT);
}
}
}
}
if (N0 == N1) {

76
test/CodeGen/X86/compare-inf.ll Normal file
View File

@ -0,0 +1,76 @@
; RUN: llc < %s -march=x86-64 | FileCheck %s
; Convert oeq and une to ole/oge/ule/uge when comparing with infinity
; and negative infinity, because those are more efficient on x86.
; CHECK: oeq_inff:
; CHECK: ucomiss
; CHECK: jae
define float @oeq_inff(float %x, float %y) nounwind readonly {
%t0 = fcmp oeq float %x, 0x7FF0000000000000
%t1 = select i1 %t0, float 1.0, float %y
ret float %t1
}
; CHECK: oeq_inf:
; CHECK: ucomisd
; CHECK: jae
define double @oeq_inf(double %x, double %y) nounwind readonly {
%t0 = fcmp oeq double %x, 0x7FF0000000000000
%t1 = select i1 %t0, double 1.0, double %y
ret double %t1
}
; CHECK: une_inff:
; CHECK: ucomiss
; CHECK: jb
define float @une_inff(float %x, float %y) nounwind readonly {
%t0 = fcmp une float %x, 0x7FF0000000000000
%t1 = select i1 %t0, float 1.0, float %y
ret float %t1
}
; CHECK: une_inf:
; CHECK: ucomisd
; CHECK: jb
define double @une_inf(double %x, double %y) nounwind readonly {
%t0 = fcmp une double %x, 0x7FF0000000000000
%t1 = select i1 %t0, double 1.0, double %y
ret double %t1
}
; CHECK: oeq_neg_inff:
; CHECK: ucomiss
; CHECK: jae
define float @oeq_neg_inff(float %x, float %y) nounwind readonly {
%t0 = fcmp oeq float %x, 0xFFF0000000000000
%t1 = select i1 %t0, float 1.0, float %y
ret float %t1
}
; CHECK: oeq_neg_inf:
; CHECK: ucomisd
; CHECK: jae
define double @oeq_neg_inf(double %x, double %y) nounwind readonly {
%t0 = fcmp oeq double %x, 0xFFF0000000000000
%t1 = select i1 %t0, double 1.0, double %y
ret double %t1
}
; CHECK: une_neg_inff:
; CHECK: ucomiss
; CHECK: jb
define float @une_neg_inff(float %x, float %y) nounwind readonly {
%t0 = fcmp une float %x, 0xFFF0000000000000
%t1 = select i1 %t0, float 1.0, float %y
ret float %t1
}
; CHECK: une_neg_inf:
; CHECK: ucomisd
; CHECK: jb
define double @une_neg_inf(double %x, double %y) nounwind readonly {
%t0 = fcmp une double %x, 0xFFF0000000000000
%t1 = select i1 %t0, double 1.0, double %y
ret double %t1
}