1 ; RUN: opt < %s -jump-threading -loop-rotate -instcombine -indvars -loop-unroll -simplifycfg -S -verify-dom-info -verify-loop-info > %t 2 ; RUN: grep {volatile store} %t | count 3 3 ; RUN: not grep {br label} %t 4 5 ; Jump threading should not prevent this loop from being unrolled. 6 7 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" 8 target triple = "i386-apple-darwin9.6" 9 @v1 = external global i32 ; <i32*> [#uses=2] 10 11 define i32 @unroll() nounwind { 12 entry: 13 br label %bb4 14 15 bb: ; preds = %bb4 16 %0 = icmp eq i32 %i.0, 0 ; <i1> [#uses=1] 17 br i1 %0, label %bb1, label %bb2 18 19 bb1: ; preds = %bb 20 volatile store i32 1000, i32* @v1, align 4 21 br label %bb3 22 23 bb2: ; preds = %bb 24 volatile store i32 1001, i32* @v1, align 4 25 br label %bb3 26 27 bb3: ; preds = %bb2, %bb1 28 %1 = add i32 %i.0, 1 ; <i32> [#uses=1] 29 br label %bb4 30 31 bb4: ; preds = %bb3, %entry 32 %i.0 = phi i32 [ 0, %entry ], [ %1, %bb3 ] ; <i32> [#uses=3] 33 %2 = icmp sgt i32 %i.0, 2 ; <i1> [#uses=1] 34 br i1 %2, label %bb5, label %bb 35 36 bb5: ; preds = %bb4 37 ret i32 0 38 } 39
