; RUN: llc < %s -march=x86 | FileCheck %s
; <rdar://problem/8449754>
-define i32 @add32carry(i32 %sum, i32 %x) nounwind readnone ssp {
+define i32 @test1(i32 %sum, i32 %x) nounwind readnone ssp {
entry:
-; CHECK: sbbl %ecx, %ecx
+; CHECK: test1:
+; CHECK: cmpl %ecx, %eax
; CHECK-NOT: addl
-; CHECK: subl %ecx, %eax
+; CHECK: adcl $0, %eax
%add4 = add i32 %x, %sum
%cmp = icmp ult i32 %add4, %x
%inc = zext i1 %cmp to i32
%z.0 = add i32 %add4, %inc
ret i32 %z.0
}
+
+; Instcombine transforms test1 into test2:
+; CHECK: test2:
+; CHECK: movl
+; CHECK-NEXT: addl
+; CHECK-NEXT: adcl $0
+; CHECK-NEXT: ret
+define i32 @test2(i32 %sum, i32 %x) nounwind readnone ssp {
+entry:
+ %uadd = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 %x, i32 %sum)
+ %0 = extractvalue { i32, i1 } %uadd, 0
+ %cmp = extractvalue { i32, i1 } %uadd, 1
+ %inc = zext i1 %cmp to i32
+ %z.0 = add i32 %0, %inc
+ ret i32 %z.0
+}
+
+declare { i32, i1 } @llvm.uadd.with.overflow.i32(i32, i32) nounwind readnone