| ; RUN: llc < %s -mtriple=aarch64-linux-gnuabi -O2 -tail-dup-placement=0 | FileCheck %s |
| ; -tail-dup-placement causes tail duplication during layout. This breaks the |
| ; assumptions of the test case as written (specifically, it creates an |
| ; additional cmp instruction, creating a false positive), so we pass |
| ; -tail-dup-placement=0 to restore the original behavior |
| |
| ; marked as external to prevent possible optimizations |
| @a = external global i32 |
| @b = external global i32 |
| @c = external global i32 |
| @d = external global i32 |
| @e = external global i32 |
| |
| define void @combine-sign-comparisons-by-cse(i32 *%arg) { |
| ; CHECK: cmp |
| ; CHECK: b.ge |
| ; CHECK-NOT: cmp |
| ; CHECK: b.le |
| |
| entry: |
| %a = load i32, i32* @a, align 4 |
| %b = load i32, i32* @b, align 4 |
| %c = load i32, i32* @c, align 4 |
| %d = load i32, i32* @d, align 4 |
| %e = load i32, i32* @e, align 4 |
| |
| %cmp = icmp slt i32 %a, %e |
| br i1 %cmp, label %land.lhs.true, label %lor.lhs.false |
| |
| land.lhs.true: |
| %cmp1 = icmp eq i32 %b, %c |
| br i1 %cmp1, label %return, label %if.end |
| |
| lor.lhs.false: |
| %cmp2 = icmp sgt i32 %a, %e |
| br i1 %cmp2, label %land.lhs.true3, label %if.end |
| |
| land.lhs.true3: |
| %cmp4 = icmp eq i32 %b, %d |
| br i1 %cmp4, label %return, label %if.end |
| |
| if.end: |
| br label %return |
| |
| return: |
| %retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ] |
| store i32 %a, i32 *%arg |
| ret void |
| } |