return DAG.getNode(X86ISD::ADC, SDLoc(N), VTs, LHS, RHS, Flags);
}
+ // Fold ADC(ADD(X,Y),0,Carry) -> ADC(X,Y,Carry)
+ // iff the flag result is dead.
+ if (LHS.getOpcode() == ISD::ADD && isNullConstant(RHS) &&
+ !N->hasAnyUseOfValue(1))
+ return DAG.getNode(X86ISD::ADC, SDLoc(N), N->getVTList(), LHS.getOperand(0),
+ LHS.getOperand(1), CarryIn);
+
return SDValue();
}
define i32 @addcarry_ult(i32 %a, i32 %b, i32 %x, i32 %y) {
; CHECK-LABEL: addcarry_ult:
; CHECK: # %bb.0:
-; CHECK-NEXT: # kill: def $esi killed $esi def $rsi
-; CHECK-NEXT: # kill: def $edi killed $edi def $rdi
-; CHECK-NEXT: leal (%rdi,%rsi), %eax
+; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: cmpl %ecx, %edx
-; CHECK-NEXT: adcl $0, %eax
+; CHECK-NEXT: adcl %esi, %eax
; CHECK-NEXT: retq
%s = add i32 %a, %b
%k = icmp ult i32 %x, %y
define i32 @addcarry_ugt(i32 %a, i32 %b, i32 %x, i32 %y) {
; CHECK-LABEL: addcarry_ugt:
; CHECK: # %bb.0:
-; CHECK-NEXT: # kill: def $esi killed $esi def $rsi
-; CHECK-NEXT: # kill: def $edi killed $edi def $rdi
-; CHECK-NEXT: leal (%rdi,%rsi), %eax
+; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: cmpl %edx, %ecx
-; CHECK-NEXT: adcl $0, %eax
+; CHECK-NEXT: adcl %esi, %eax
; CHECK-NEXT: retq
%s = add i32 %a, %b
%k = icmp ugt i32 %x, %y