1 ; RUN: llc < %s -mtriple=thumbv7-apple-darwin10 -relocation-model=pic | FileCheck %s 2 ; rdar://7387640 3 4 ; This now reduces to a single induction variable. 5 6 ; TODO: It still gets a GPR shuffle at the end of the loop 7 ; This is because something in instruction selection has decided 8 ; that comparing the pre-incremented value with zero is better 9 ; than comparing the post-incremented value with -4. 10 11 @G = external global i32 ; <i32*> [#uses=2] 12 @array = external global i32* ; <i32**> [#uses=1] 13 14 define void @t() nounwind optsize { 15 ; CHECK: t: 16 ; CHECK: mov{{.*}}, #1000 17 entry: 18 %.pre = load i32* @G, align 4 ; <i32> [#uses=1] 19 br label %bb 20 21 bb: ; preds = %bb, %entry 22 ; CHECK: LBB0_1: 23 ; CHECK: cmp [[R2:r[0-9]+]], #0 24 ; CHECK: sub{{(.w)?}} [[REGISTER:(r[0-9]+)|(lr)]], [[R2]], #1 25 ; CHECK: mov [[R2]], [[REGISTER]] 26 27 %0 = phi i32 [ %.pre, %entry ], [ %3, %bb ] ; <i32> [#uses=1] 28 %indvar = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=2] 29 %tmp5 = sub i32 1000, %indvar ; <i32> [#uses=1] 30 %1 = load i32** @array, align 4 ; <i32*> [#uses=1] 31 %scevgep = getelementptr i32* %1, i32 %tmp5 ; <i32*> [#uses=1] 32 %2 = load i32* %scevgep, align 4 ; <i32> [#uses=1] 33 %3 = add nsw i32 %2, %0 ; <i32> [#uses=2] 34 store i32 %3, i32* @G, align 4 35 %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2] 36 %exitcond = icmp eq i32 %indvar.next, 1001 ; <i1> [#uses=1] 37 br i1 %exitcond, label %return, label %bb 38 39 return: ; preds = %bb 40 ret void 41 } 42
