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; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
define void @redundant_add(i64 %n) {
; Check that we don't create two additions for the sadd.with.overflow.
; CHECK-LABEL: redundant_add
; CHECK-NOT: leaq
; CHECK-NOT: addq
; CHECK: incq
; CHECK-NEXT: jno
entry:
br label %exit_check
exit_check:
%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
%c = icmp slt i64 %i, %n
br i1 %c, label %loop, label %exit
loop:
%i.o = tail call { i64, i1 } @llvm.sadd.with.overflow.i64(i64 %i, i64 1)
%i.next = extractvalue { i64, i1 } %i.o, 0
%o = extractvalue { i64, i1 } %i.o, 1
br i1 %o, label %overflow, label %exit_check
exit:
ret void
overflow:
tail call void @llvm.trap()
unreachable
}
declare { i64, i1 } @llvm.sadd.with.overflow.i64(i64, i64)
declare void @llvm.trap()
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