| ; RUN: opt -passes=indvars -S < %s | FileCheck %s |
| |
| declare void @use(i32) |
| declare void @use.i8(i8) |
| |
| define void @f() { |
| ; CHECK-LABEL: @f |
| entry: |
| br label %loop |
| |
| loop: |
| ; The only use for idx.mirror is to induce an nuw for %idx. It does |
| ; not induce an nuw for %idx.inc |
| %idx.mirror = phi i8 [ -6, %entry ], [ %idx.mirror.inc, %loop ] |
| %idx = phi i8 [ -5, %entry ], [ %idx.inc, %loop ] |
| |
| %idx.sext = sext i8 %idx to i32 |
| call void @use(i32 %idx.sext) |
| |
| %idx.mirror.inc = add nuw i8 %idx.mirror, 1 |
| call void @use.i8(i8 %idx.mirror.inc) |
| |
| %idx.inc = add i8 %idx, 1 |
| ; CHECK-NOT: %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1 |
| %cmp = icmp ugt i8 %idx.inc, 0 |
| br i1 %cmp, label %loop, label %exit |
| |
| exit: |
| ret void |
| } |
