1; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a8 -regalloc=fast -optimize-regalloc=0 | FileCheck %s -check-prefix=A8
2; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-m3 -regalloc=fast -optimize-regalloc=0 | FileCheck %s -check-prefix=M3
3; rdar://6949835
4; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a8 -regalloc=basic | FileCheck %s -check-prefix=BASIC
5; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a8 -regalloc=greedy | FileCheck %s -check-prefix=GREEDY
6
7; Magic ARM pair hints works best with linearscan / fast.
8
9; Cortex-M3 errata 602117: LDRD with base in list may result in incorrect base
10; register when interrupted or faulted.
11
12@b = external global i64*
13
14define i64 @t(i64 %a) nounwind readonly {
15entry:
16; A8-LABEL: t:
17; A8:   ldrd r2, r3, [r2]
18
19; M3-LABEL: t:
20; M3-NOT: ldrd
21
22	%0 = load i64** @b, align 4
23	%1 = load i64* %0, align 4
24	%2 = mul i64 %1, %a
25	ret i64 %2
26}
27
28; rdar://10435045 mixed LDRi8/LDRi12
29;
30; In this case, LSR generate a sequence of LDRi8/LDRi12. We should be
31; able to generate an LDRD pair here, but this is highly sensitive to
32; regalloc hinting. So, this doubles as a register allocation
33; test. RABasic currently does a better job within the inner loop
34; because of its *lack* of hinting ability. Whereas RAGreedy keeps
35; R0/R1/R2 live as the three arguments, forcing the LDRD's odd
36; destination into R3. We then sensibly split LDRD again rather then
37; evict another live range or use callee saved regs. Sorry if the test
38; is sensitive to Regalloc changes, but it is an interesting case.
39;
40; BASIC: @f
41; BASIC: %bb
42; BASIC: ldrd
43; BASIC: str
44; GREEDY: @f
45; GREEDY: %bb
46; GREEDY: ldrd
47; GREEDY: str
48define void @f(i32* nocapture %a, i32* nocapture %b, i32 %n) nounwind {
49entry:
50  %0 = add nsw i32 %n, -1                         ; <i32> [#uses=2]
51  %1 = icmp sgt i32 %0, 0                         ; <i1> [#uses=1]
52  br i1 %1, label %bb, label %return
53
54bb:                                               ; preds = %bb, %entry
55  %i.03 = phi i32 [ %tmp, %bb ], [ 0, %entry ]    ; <i32> [#uses=3]
56  %scevgep = getelementptr i32* %a, i32 %i.03     ; <i32*> [#uses=1]
57  %scevgep4 = getelementptr i32* %b, i32 %i.03    ; <i32*> [#uses=1]
58  %tmp = add i32 %i.03, 1                         ; <i32> [#uses=3]
59  %scevgep5 = getelementptr i32* %a, i32 %tmp     ; <i32*> [#uses=1]
60  %2 = load i32* %scevgep, align 4                ; <i32> [#uses=1]
61  %3 = load i32* %scevgep5, align 4               ; <i32> [#uses=1]
62  %4 = add nsw i32 %3, %2                         ; <i32> [#uses=1]
63  store i32 %4, i32* %scevgep4, align 4
64  %exitcond = icmp eq i32 %tmp, %0                ; <i1> [#uses=1]
65  br i1 %exitcond, label %return, label %bb
66
67return:                                           ; preds = %bb, %entry
68  ret void
69}
70
71; rdar://13978317
72; Pair of loads not formed when lifetime markers are set.
73%struct.Test = type { i32, i32, i32 }
74
75@TestVar = external global %struct.Test
76
77define void @Func1() nounwind ssp {
78; CHECK: @Func1
79entry:
80; A8: movw [[BASE:r[0-9]+]], :lower16:{{.*}}TestVar{{.*}}
81; A8: movt [[BASE]], :upper16:{{.*}}TestVar{{.*}}
82; A8: ldrd [[FIELD1:r[0-9]+]], [[FIELD2:r[0-9]+]], {{\[}}[[BASE]], #4]
83; A8-NEXT: add [[FIELD1]], [[FIELD2]]
84; A8-NEXT: str [[FIELD1]], {{\[}}[[BASE]]{{\]}}
85  %orig_blocks = alloca [256 x i16], align 2
86  %0 = bitcast [256 x i16]* %orig_blocks to i8*call void @llvm.lifetime.start(i64 512, i8* %0) nounwind
87  %tmp1 = load i32* getelementptr inbounds (%struct.Test* @TestVar, i32 0, i32 1), align 4
88  %tmp2 = load i32* getelementptr inbounds (%struct.Test* @TestVar, i32 0, i32 2), align 4
89  %add = add nsw i32 %tmp2, %tmp1
90  store i32 %add, i32* getelementptr inbounds (%struct.Test* @TestVar, i32 0, i32 0), align 4
91  call void @llvm.lifetime.end(i64 512, i8* %0) nounwind
92  ret void
93}
94
95
96declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
97declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
98