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; RUN: llc < %s -mtriple=thumbv7-apple-darwin10 -relocation-model=pic | FileCheck %s
; rdar://7387640
; This now reduces to a single induction variable.
; TODO: It still gets a GPR shuffle at the end of the loop
; This is because something in instruction selection has decided
; that comparing the pre-incremented value with zero is better
; than comparing the post-incremented value with -4.
@G = external global i32 ; <i32*> [#uses=2]
@array = external global i32* ; <i32**> [#uses=1]
define void @t() nounwind optsize {
; CHECK: t:
; CHECK: mov{{.*}}, #1000
entry:
%.pre = load i32* @G, align 4 ; <i32> [#uses=1]
br label %bb
bb: ; preds = %bb, %entry
; CHECK: LBB0_1:
; CHECK: cmp [[R2:r[0-9]+]], #0
; CHECK: sub{{(.w)?}} [[REGISTER:(r[0-9]+)|(lr)]], [[R2]], #1
; CHECK: mov [[R2]], [[REGISTER]]
%0 = phi i32 [ %.pre, %entry ], [ %3, %bb ] ; <i32> [#uses=1]
%indvar = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=2]
%tmp5 = sub i32 1000, %indvar ; <i32> [#uses=1]
%1 = load i32** @array, align 4 ; <i32*> [#uses=1]
%scevgep = getelementptr i32* %1, i32 %tmp5 ; <i32*> [#uses=1]
%2 = load i32* %scevgep, align 4 ; <i32> [#uses=1]
%3 = add nsw i32 %2, %0 ; <i32> [#uses=2]
store i32 %3, i32* @G, align 4
%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2]
%exitcond = icmp eq i32 %indvar.next, 1001 ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb
ret void
}
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