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comparison test/CodeGen/ARM/byval-align.ll @ 95:afa8332a0e37

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
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84:f3e34b893a5f 95:afa8332a0e37
1 ; RUN: llc -mtriple=thumbv7-apple-ios8.0 %s -o - | FileCheck %s
2
3 ; This checks that alignments greater than 4 are respected by APCS
4 ; targets. Mostly here to make sure *some* correct code is created after some
5 ; simplifying refactoring; at the time of writing there were no actual APCS
6 ; users of byval alignments > 4, so no real calls for ABI stability.
7
8 ; "byval align 16" can't fit in any regs with an i8* taking up r0.
9 define i32 @test_align16(i8*, [4 x i32]* byval align 16 %b) {
10 ; CHECK-LABEL: test_align16:
11 ; CHECK-NOT: sub sp
12 ; CHECK: push {r4, r7, lr}
13 ; CHECK: add r7, sp, #4
14
15 ; CHECK: ldr r0, [r7, #8]
16
17 call void @bar()
18 %valptr = getelementptr [4 x i32], [4 x i32]* %b, i32 0, i32 0
19 %val = load i32, i32* %valptr
20 ret i32 %val
21 }
22
23 ; byval align 8 can, but we used to incorrectly set r7 here (miscalculating the
24 ; space taken up by arg regs).
25 define i32 @test_align8(i8*, [4 x i32]* byval align 8 %b) {
26 ; CHECK-LABEL: test_align8:
27 ; CHECK: sub sp, #8
28 ; CHECK: push {r4, r7, lr}
29 ; CHECK: add r7, sp, #4
30
31 ; CHECK: strd r2, r3, [r7, #8]
32
33 ; CHECK: ldr r0, [r7, #8]
34
35 call void @bar()
36 %valptr = getelementptr [4 x i32], [4 x i32]* %b, i32 0, i32 0
37 %val = load i32, i32* %valptr
38 ret i32 %val
39 }
40
41 ; "byval align 32" can't fit in regs no matter what: it would be misaligned
42 ; unless the incoming stack was deliberately misaligned.
43 define i32 @test_align32(i8*, [4 x i32]* byval align 32 %b) {
44 ; CHECK-LABEL: test_align32:
45 ; CHECK-NOT: sub sp
46 ; CHECK: push {r4, r7, lr}
47 ; CHECK: add r7, sp, #4
48
49 ; CHECK: ldr r0, [r7, #8]
50
51 call void @bar()
52 %valptr = getelementptr [4 x i32], [4 x i32]* %b, i32 0, i32 0
53 %val = load i32, i32* %valptr
54 ret i32 %val
55 }
56
57 ; When passing an object "byval align N", the stack must be at least N-aligned.
58 define void @test_call_align16() {
59 ; CHECK-LABEL: test_call_align16:
60 ; CHECK: push {r4, r7, lr}
61 ; CHECK: add r7, sp, #4
62
63 ; CHECK: mov [[TMP:r[0-9]+]], sp
64 ; CHECK: bfc [[TMP]], #0, #4
65 ; CHECK: mov sp, [[TMP]]
66
67 ; While we're here, make sure the caller also puts it at sp
68 ; CHECK: mov r[[BASE:[0-9]+]], sp
69 ; CHECK: vst1.32 {d{{[0-9]+}}, d{{[0-9]+}}}, [r[[BASE]]]
70 call i32 @test_align16(i8* null, [4 x i32]* byval align 16 @var)
71 ret void
72 }
73
74 @var = global [4 x i32] zeroinitializer
75 declare void @bar()