| ; RUN: opt < %s -jump-threading -loop-rotate -instcombine -indvars -loop-unroll -simplifycfg -S -verify-dom-info -verify-loop-info > %t |
| ; RUN: grep "store volatile" %t | count 3 |
| ; RUN: not grep "br label" %t |
| |
| ; Jump threading should not prevent this loop from being unrolled. |
| |
| target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" |
| target triple = "i386-apple-darwin9.6" |
| @v1 = external global i32 ; <i32*> [#uses=2] |
| |
| define i32 @unroll() nounwind { |
| entry: |
| br label %bb4 |
| |
| bb: ; preds = %bb4 |
| %0 = icmp eq i32 %i.0, 0 ; <i1> [#uses=1] |
| br i1 %0, label %bb1, label %bb2 |
| |
| bb1: ; preds = %bb |
| store volatile i32 1000, i32* @v1, align 4 |
| br label %bb3 |
| |
| bb2: ; preds = %bb |
| store volatile i32 1001, i32* @v1, align 4 |
| br label %bb3 |
| |
| bb3: ; preds = %bb2, %bb1 |
| %1 = add i32 %i.0, 1 ; <i32> [#uses=1] |
| br label %bb4 |
| |
| bb4: ; preds = %bb3, %entry |
| %i.0 = phi i32 [ 0, %entry ], [ %1, %bb3 ] ; <i32> [#uses=3] |
| %2 = icmp sgt i32 %i.0, 2 ; <i1> [#uses=1] |
| br i1 %2, label %bb5, label %bb |
| |
| bb5: ; preds = %bb4 |
| ret i32 0 |
| } |
