| ; RUN: opt < %s -passes=lcssa,loop-simplify,indvars -S | FileCheck %s |
| target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-unknown" |
| |
| @a = external global i32, align 4 |
| |
| ; Check that loop-simplify merges two loop exits, but preserves LCSSA form. |
| ; CHECK-LABEL: @foo |
| ; CHECK: for: |
| ; CHECK: %or.cond = select i1 %cmp1, i1 %cmp2, i1 false |
| ; CHECK-NOT: for.cond: |
| ; CHECK: for.end: |
| ; CHECK: %a.lcssa = phi i32 [ %a, %for ] |
| define i32 @foo(i32 %x) { |
| entry: |
| br label %for |
| |
| for: |
| %iv = phi i32 [ 0, %entry ], [ %iv.next, %for.cond ] |
| %cmp1 = icmp eq i32 %x, 0 |
| %iv.next = add nuw nsw i32 %iv, 1 |
| %a = load i32, ptr @a |
| br i1 %cmp1, label %for.cond, label %for.end |
| |
| for.cond: |
| %cmp2 = icmp slt i32 %iv.next, 4 |
| br i1 %cmp2, label %for, label %for.end |
| |
| for.end: |
| %a.lcssa = phi i32 [ %a, %for ], [ %a, %for.cond ] |
| ret i32 %a.lcssa |
| } |
