| ; 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 |
| } |
