1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
; RUN: llc -mtriple=thumbv7-apple-darwin-eabi < %s | FileCheck %s
; RUN: llc -mtriple=thumbv6m-apple-darwin-eabi -disable-fp-elim < %s | FileCheck %s --check-prefix=CHECK-T1
; RUN: llc -mtriple=thumbv7-apple-darwin-ios -disable-fp-elim < %s | FileCheck %s --check-prefix=CHECK-IOS
declare void @bar(i8*)
%bigVec = type [2 x double]
@var = global %bigVec zeroinitializer
define void @check_simple() minsize {
; CHECK-LABEL: check_simple:
; CHECK: push.w {r7, r8, r9, r10, r11, lr}
; CHECK-NOT: sub sp, sp,
; ...
; CHECK-NOT: add sp, sp,
; CHECK: pop.w {r0, r1, r2, r3, r11, pc}
; CHECK-T1-LABEL: check_simple:
; CHECK-T1: push {r3, r4, r5, r6, r7, lr}
; CHECK-T1: add r7, sp, #16
; CHECK-T1-NOT: sub sp, sp,
; ...
; CHECK-T1-NOT: add sp, sp,
; CHECK-T1: pop {r0, r1, r2, r3, r7, pc}
; iOS always has a frame pointer and messing with the push affects
; how it's set in the prologue. Make sure we get that right.
; CHECK-IOS-LABEL: check_simple:
; CHECK-IOS: push {r3, r4, r5, r6, r7, lr}
; CHECK-NOT: sub sp,
; CHECK-IOS: add r7, sp, #16
; CHECK-NOT: sub sp,
; ...
; CHECK-NOT: add sp,
; CHEC: pop {r3, r4, r5, r6, r7, pc}
%var = alloca i8, i32 16
call void @bar(i8* %var)
ret void
}
define void @check_simple_too_big() minsize {
; CHECK-LABEL: check_simple_too_big:
; CHECK: push.w {r11, lr}
; CHECK: sub sp,
; ...
; CHECK: add sp,
; CHECK: pop.w {r11, pc}
%var = alloca i8, i32 64
call void @bar(i8* %var)
ret void
}
define void @check_vfp_fold() minsize {
; CHECK-LABEL: check_vfp_fold:
; CHECK: push {r[[GLOBREG:[0-9]+]], lr}
; CHECK: vpush {d6, d7, d8, d9}
; CHECK-NOT: sub sp,
; ...
; CHECK: vldmia r[[GLOBREG]], {d8, d9}
; ...
; CHECK-NOT: add sp,
; CHECK: vpop {d6, d7, d8, d9}
; CHECKL pop {r[[GLOBREG]], pc}
; iOS uses aligned NEON stores here, which is convenient since we
; want to make sure that works too.
; CHECK-IOS-LABEL: check_vfp_fold:
; CHECK-IOS: push {r0, r1, r2, r3, r4, r7, lr}
; CHECK-IOS: sub.w r4, sp, #16
; CHECK-IOS: bic r4, r4, #15
; CHECK-IOS: mov sp, r4
; CHECK-IOS: vst1.64 {d8, d9}, [r4:128]
; ...
; CHECK-IOS: add r4, sp, #16
; CHECK-IOS: vld1.64 {d8, d9}, [r4:128]
; CHECK-IOS: mov sp, r4
; CHECK-IOS: pop {r4, r7, pc}
%var = alloca i8, i32 16
%tmp = load %bigVec* @var
call void @bar(i8* %var)
store %bigVec %tmp, %bigVec* @var
ret void
}
; This function should use just enough space that the "add sp, sp, ..." could be
; folded in except that doing so would clobber the value being returned.
define i64 @check_no_return_clobber() minsize {
; CHECK-LABEL: check_no_return_clobber:
; CHECK: push.w {r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, lr}
; CHECK-NOT: sub sp,
; ...
; CHECK: add sp, #40
; CHECK: pop.w {r11, pc}
; Just to keep iOS FileCheck within previous function:
; CHECK-IOS-LABEL: check_no_return_clobber:
%var = alloca i8, i32 40
call void @bar(i8* %var)
ret i64 0
}
define arm_aapcs_vfpcc double @check_vfp_no_return_clobber() minsize {
; CHECK-LABEL: check_vfp_no_return_clobber:
; CHECK: push {r[[GLOBREG:[0-9]+]], lr}
; CHECK: vpush {d0, d1, d2, d3, d4, d5, d6, d7, d8, d9}
; CHECK-NOT: sub sp,
; ...
; CHECK: add sp, #64
; CHECK: vpop {d8, d9}
; CHECK: pop {r[[GLOBREG]], pc}
%var = alloca i8, i32 64
%tmp = load %bigVec* @var
call void @bar(i8* %var)
store %bigVec %tmp, %bigVec* @var
ret double 1.0
}
@dbl = global double 0.0
; PR18136: there was a bug determining where the first eligible pop in a
; basic-block was when the entire block was epilogue code.
define void @test_fold_point(i1 %tst) minsize {
; CHECK-LABEL: test_fold_point:
; Important to check for beginning of basic block, because if it gets
; if-converted the test is probably no longer checking what it should.
; CHECK: {{LBB[0-9]+_2}}:
; CHECK-NEXT: vpop {d7, d8}
; CHECK-NEXT: pop {r4, pc}
; With a guaranteed frame-pointer, we want to make sure that its offset in the
; push block is correct, even if a few registers have been tacked onto a later
; vpush (PR18160).
; CHECK-IOS-LABEL: test_fold_point:
; CHECK-IOS: push {r4, r7, lr}
; CHECK-IOS-NEXT: add r7, sp, #4
; CHECK-IOS-NEXT: vpush {d7, d8}
; We want some memory so there's a stack adjustment to fold...
%var = alloca i8, i32 8
; We want a long-lived floating register so that a callee-saved dN is used and
; there's both a vpop and a pop.
%live_val = load double* @dbl
br i1 %tst, label %true, label %end
true:
call void @bar(i8* %var)
store double %live_val, double* @dbl
br label %end
end:
; We want the epilogue to be the only thing in a basic block so that we hit
; the correct edge-case (first inst in block is correct one to adjust).
ret void
}
|
