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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=jump-threading,loop-rotate,instcombine,indvars,loop-unroll,simplifycfg -simplifycfg-require-and-preserve-domtree=1 -verify-dom-info -verify-loop-info < %s | FileCheck %s
; Jump threading should not prevent this loop from being unrolled.
; There should be 3 volatile stores and no branch
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 ; <ptr> [#uses=2]
define i32 @unroll() nounwind {
; CHECK-LABEL: @unroll(
; CHECK-NEXT: entry:
; CHECK-NEXT: store volatile i32 1000, ptr @v1, align 4
; CHECK-NEXT: store volatile i32 1001, ptr @v1, align 4
; CHECK-NEXT: store volatile i32 1001, ptr @v1, align 4
; CHECK-NEXT: ret i32 0
;
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, ptr @v1, align 4
br label %bb3
bb2: ; preds = %bb
store volatile i32 1001, ptr @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
}
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