no-irreducible-loops.ll
1.08 KB
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; 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
}