}
}
- const APInt *C1;
- if (match(CmpRHS, m_APInt(C1))) {
- // Sign-extending LHS does not change its sign, so TrueVal/FalseVal can
- // match against either LHS or sext(LHS).
- auto MaybeSExtLHS = m_CombineOr(m_Specific(CmpLHS),
- m_SExt(m_Specific(CmpLHS)));
- if ((match(TrueVal, MaybeSExtLHS) &&
- match(FalseVal, m_Neg(m_Specific(TrueVal)))) ||
- (match(FalseVal, MaybeSExtLHS) &&
- match(TrueVal, m_Neg(m_Specific(FalseVal))))) {
- // Set LHS and RHS so that RHS is the negated operand of the select
- if (match(TrueVal, MaybeSExtLHS)) {
- LHS = TrueVal;
- RHS = FalseVal;
- } else {
- LHS = FalseVal;
- RHS = TrueVal;
- }
-
- // 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->isNullValue() || C1->isAllOnesValue())) {
- return {(LHS == TrueVal) ? SPF_ABS : SPF_NABS, SPNB_NA, false};
- }
-
- // 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->isNullValue() || C1->isOneValue())) {
- return {(LHS == FalseVal) ? SPF_ABS : SPF_NABS, SPNB_NA, false};
- }
+ // Sign-extending LHS does not change its sign, so TrueVal/FalseVal can
+ // match against either LHS or sext(LHS).
+ auto MaybeSExtLHS = m_CombineOr(m_Specific(CmpLHS),
+ m_SExt(m_Specific(CmpLHS)));
+ if ((match(TrueVal, MaybeSExtLHS) &&
+ match(FalseVal, m_Neg(m_Specific(TrueVal)))) ||
+ (match(FalseVal, MaybeSExtLHS) &&
+ match(TrueVal, m_Neg(m_Specific(FalseVal))))) {
+ // Set LHS and RHS so that RHS is the negated operand of the select
+ if (match(TrueVal, MaybeSExtLHS)) {
+ LHS = TrueVal;
+ RHS = FalseVal;
+ } else {
+ LHS = FalseVal;
+ RHS = TrueVal;
}
+
+ // (X >s 0) ? X : -X or (X >s -1) ? X : -X --> ABS(X)
+ // (X >s 0) ? -X : X or (X >s -1) ? -X : X --> NABS(X)
+ if (Pred == ICmpInst::ICMP_SGT &&
+ match(CmpRHS, m_CombineOr(m_ZeroInt(), m_AllOnes())))
+ return {(LHS == TrueVal) ? SPF_ABS : SPF_NABS, SPNB_NA, false};
+
+ // (X <s 0) ? -X : X or (X <s 1) ? -X : X --> ABS(X)
+ // (X <s 0) ? X : -X or (X <s 1) ? X : -X --> NABS(X)
+ if (Pred == ICmpInst::ICMP_SLT &&
+ match(CmpRHS, m_CombineOr(m_ZeroInt(), m_One())))
+ return {(LHS == FalseVal) ? SPF_ABS : SPF_NABS, SPNB_NA, false};
}
if (CmpInst::isIntPredicate(Pred))
define <2 x i8> @abs_canonical_2_vec_undef_elts(<2 x i8> %x) {
; CHECK-LABEL: @abs_canonical_2_vec_undef_elts(
-; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 undef, i8 -1>
+; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> [[X:%.*]], zeroinitializer
; CHECK-NEXT: [[NEG:%.*]] = sub <2 x i8> zeroinitializer, [[X]]
-; CHECK-NEXT: [[ABS:%.*]] = select <2 x i1> [[CMP]], <2 x i8> [[X]], <2 x i8> [[NEG]]
+; CHECK-NEXT: [[ABS:%.*]] = select <2 x i1> [[CMP]], <2 x i8> [[NEG]], <2 x i8> [[X]]
; CHECK-NEXT: ret <2 x i8> [[ABS]]
;
%cmp = icmp sgt <2 x i8> %x, <i8 undef, i8 -1>
define <2 x i8> @nabs_canonical_2_vec_undef_elts(<2 x i8> %x) {
; CHECK-LABEL: @nabs_canonical_2_vec_undef_elts(
-; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 -1, i8 undef>
+; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> [[X:%.*]], zeroinitializer
; CHECK-NEXT: [[NEG:%.*]] = sub <2 x i8> zeroinitializer, [[X]]
-; CHECK-NEXT: [[ABS:%.*]] = select <2 x i1> [[CMP]], <2 x i8> [[NEG]], <2 x i8> [[X]]
+; CHECK-NEXT: [[ABS:%.*]] = select <2 x i1> [[CMP]], <2 x i8> [[X]], <2 x i8> [[NEG]]
; CHECK-NEXT: ret <2 x i8> [[ABS]]
;
%cmp = icmp sgt <2 x i8> %x, <i8 -1, i8 undef>