| ; 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() | |