| ; 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() |
| |
