1; RUN: llc < %s -march=x86-64 -relocation-model=static -mtriple=x86_64-unknown-linux-gnu -asm-verbose=0 | FileCheck %s 2 3; The inner loop should require only one add (and no leas either). 4; rdar://8100380 5 6; CHECK: BB0_3: 7; CHECK-NEXT: movb $0, flags(%rdx) 8; CHECK-NEXT: addq %rax, %rdx 9; CHECK-NEXT: cmpq $8192, %rdx 10; CHECK-NEXT: jl 11 12@flags = external global [8192 x i8], align 16 ; <[8192 x i8]*> [#uses=1] 13 14define void @foo() nounwind { 15entry: 16 %tmp = icmp slt i64 2, 8192 ; <i1> [#uses=1] 17 br i1 %tmp, label %bb, label %bb21 18 19bb: ; preds = %entry 20 br label %bb7 21 22bb7: ; preds = %bb, %bb17 23 %tmp8 = phi i64 [ %tmp18, %bb17 ], [ 2, %bb ] ; <i64> [#uses=2] 24 %tmp9 = icmp slt i64 2, 8192 ; <i1> [#uses=1] 25 br i1 %tmp9, label %bb10, label %bb17 26 27bb10: ; preds = %bb7 28 br label %bb11 29 30bb11: ; preds = %bb10, %bb11 31 %tmp12 = phi i64 [ %tmp14, %bb11 ], [ 2, %bb10 ] ; <i64> [#uses=2] 32 %tmp13 = getelementptr inbounds [8192 x i8]* @flags, i64 0, i64 %tmp12 ; <i8*> [#uses=1] 33 store i8 0, i8* %tmp13, align 1 34 %tmp14 = add nsw i64 %tmp12, %tmp8 ; <i64> [#uses=2] 35 %tmp15 = icmp slt i64 %tmp14, 8192 ; <i1> [#uses=1] 36 br i1 %tmp15, label %bb11, label %bb16 37 38bb16: ; preds = %bb11 39 br label %bb17 40 41bb17: ; preds = %bb16, %bb7 42 %tmp18 = add nsw i64 %tmp8, 1 ; <i64> [#uses=2] 43 %tmp19 = icmp slt i64 %tmp18, 8192 ; <i1> [#uses=1] 44 br i1 %tmp19, label %bb7, label %bb20 45 46bb20: ; preds = %bb17 47 br label %bb21 48 49bb21: ; preds = %bb20, %entry 50 ret void 51} 52