- if (SI->getTrueValue() == ICI->getOperand(1) &&
- SI->getFalseValue() == ICI->getOperand(0)) {
- switch (ICI->getPredicate()) {
- default: return SPF_UNKNOWN; // Equality.
- case ICmpInst::ICMP_UGT:
- case ICmpInst::ICMP_UGE: return SPF_UMIN;
- case ICmpInst::ICMP_SGT:
- case ICmpInst::ICMP_SGE: return SPF_SMIN;
- case ICmpInst::ICMP_ULT:
- case ICmpInst::ICMP_ULE: return SPF_UMAX;
- case ICmpInst::ICMP_SLT:
- case ICmpInst::ICMP_SLE: return SPF_SMAX;
+ if (TrueVal == CmpRHS && FalseVal == CmpLHS) {
+ switch (Pred) {
+ default: return SPF_UNKNOWN; // Equality.
+ case ICmpInst::ICMP_UGT:
+ case ICmpInst::ICMP_UGE: return SPF_UMIN;
+ case ICmpInst::ICMP_SGT:
+ case ICmpInst::ICMP_SGE: return SPF_SMIN;
+ case ICmpInst::ICMP_ULT:
+ case ICmpInst::ICMP_ULE: return SPF_UMAX;
+ case ICmpInst::ICMP_SLT:
+ case ICmpInst::ICMP_SLE: return SPF_SMAX;
+ }
+ }
+
+ if (ConstantInt *C1 = dyn_cast<ConstantInt>(CmpRHS)) {
+ if ((CmpLHS == TrueVal && match(FalseVal, m_Neg(m_Specific(CmpLHS)))) ||
+ (CmpLHS == FalseVal && match(TrueVal, m_Neg(m_Specific(CmpLHS))))) {
+
+ // ABS(X) ==> (X >s 0) ? X : -X and (X >s -1) ? X : -X
+ // NABS(X) ==> (X >s 0) ? -X : X and (X >s -1) ? -X : X
+ if (Pred == ICmpInst::ICMP_SGT && (C1->isZero() || C1->isMinusOne())) {
+ return (CmpLHS == TrueVal) ? SPF_ABS : SPF_NABS;
+ }
+
+ // ABS(X) ==> (X <s 0) ? -X : X and (X <s 1) ? -X : X
+ // NABS(X) ==> (X <s 0) ? X : -X and (X <s 1) ? X : -X
+ if (Pred == ICmpInst::ICMP_SLT && (C1->isZero() || C1->isOne())) {
+ return (CmpLHS == FalseVal) ? SPF_ABS : SPF_NABS;
+ }