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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
; RUN: llc < %s -mtriple=armv6-linux-gnueabi | FileCheck %s -check-prefix=CHECKELF
; RUN: llc < %s -mtriple=thumbv7-apple-ios5.0 | FileCheck %s -check-prefix=CHECKT2D
declare i16 @identity16(i16 returned %x)
declare i32 @identity32(i32 returned %x)
declare zeroext i16 @retzext16(i16 returned %x)
declare i16 @paramzext16(i16 zeroext returned %x)
declare zeroext i16 @bothzext16(i16 zeroext returned %x)
; The zeroext param attribute below is meant to have no effect
define i16 @test_identity(i16 zeroext %x) {
entry:
; CHECKELF-LABEL: test_identity:
; CHECKELF: mov [[SAVEX:r[0-9]+]], r0
; CHECKELF: bl identity16
; CHECKELF: uxth r0, r0
; CHECKELF: bl identity32
; CHECKELF: mov r0, [[SAVEX]]
; CHECKT2D-LABEL: test_identity:
; CHECKT2D: mov [[SAVEX:r[0-9]+]], r0
; CHECKT2D: bl _identity16
; CHECKT2D: uxth r0, r0
; CHECKT2D: bl _identity32
; CHECKT2D: mov r0, [[SAVEX]]
%call = tail call i16 @identity16(i16 returned %x)
%b = zext i16 %call to i32
%call2 = tail call i32 @identity32(i32 returned %b)
ret i16 %x
}
; FIXME: This ought not to require register saving but currently does because
; x is not considered equal to %call (see SelectionDAGBuilder.cpp)
define i16 @test_matched_ret(i16 %x) {
entry:
; CHECKELF-LABEL: test_matched_ret:
; This shouldn't be required
; CHECKELF: mov [[SAVEX:r[0-9]+]], r0
; CHECKELF: bl retzext16
; CHECKELF-NOT: uxth r0, {{r[0-9]+}}
; CHECKELF: bl identity32
; This shouldn't be required
; CHECKELF: mov r0, [[SAVEX]]
; CHECKT2D-LABEL: test_matched_ret:
; This shouldn't be required
; CHECKT2D: mov [[SAVEX:r[0-9]+]], r0
; CHECKT2D: bl _retzext16
; CHECKT2D-NOT: uxth r0, {{r[0-9]+}}
; CHECKT2D: bl _identity32
; This shouldn't be required
; CHECKT2D: mov r0, [[SAVEX]]
%call = tail call i16 @retzext16(i16 returned %x)
%b = zext i16 %call to i32
%call2 = tail call i32 @identity32(i32 returned %b)
ret i16 %x
}
define i16 @test_mismatched_ret(i16 %x) {
entry:
; CHECKELF-LABEL: test_mismatched_ret:
; CHECKELF: mov [[SAVEX:r[0-9]+]], r0
; CHECKELF: bl retzext16
; CHECKELF: sxth r0, {{r[0-9]+}}
; CHECKELF: bl identity32
; CHECKELF: mov r0, [[SAVEX]]
; CHECKT2D-LABEL: test_mismatched_ret:
; CHECKT2D: mov [[SAVEX:r[0-9]+]], r0
; CHECKT2D: bl _retzext16
; CHECKT2D: sxth r0, {{r[0-9]+}}
; CHECKT2D: bl _identity32
; CHECKT2D: mov r0, [[SAVEX]]
%call = tail call i16 @retzext16(i16 returned %x)
%b = sext i16 %call to i32
%call2 = tail call i32 @identity32(i32 returned %b)
ret i16 %x
}
define i16 @test_matched_paramext(i16 %x) {
entry:
; CHECKELF-LABEL: test_matched_paramext:
; CHECKELF: uxth r0, r0
; CHECKELF: bl paramzext16
; CHECKELF: uxth r0, r0
; CHECKELF: bl identity32
; CHECKELF: b paramzext16
; CHECKT2D-LABEL: test_matched_paramext:
; CHECKT2D: uxth r0, r0
; CHECKT2D: bl _paramzext16
; CHECKT2D: uxth r0, r0
; CHECKT2D: bl _identity32
; CHECKT2D: b.w _paramzext16
%call = tail call i16 @paramzext16(i16 zeroext returned %x)
%b = zext i16 %call to i32
%call2 = tail call i32 @identity32(i32 returned %b)
%call3 = tail call i16 @paramzext16(i16 zeroext returned %call)
ret i16 %call3
}
; FIXME: This theoretically ought to optimize to exact same output as the
; version above, but doesn't currently (see SelectionDAGBuilder.cpp)
define i16 @test_matched_paramext2(i16 %x) {
entry:
; Since there doesn't seem to be an unambiguous optimal selection and
; scheduling of uxth and mov instructions below in lieu of the 'returned'
; optimization, don't bother checking: just verify that the calls are made
; in the correct order as a basic correctness check.
; CHECKELF-LABEL: test_matched_paramext2:
; CHECKELF: bl paramzext16
; CHECKELF: bl identity32
; CHECKELF: b paramzext16
; CHECKT2D-LABEL: test_matched_paramext2:
; CHECKT2D: bl _paramzext16
; CHECKT2D: bl _identity32
; CHECKT2D: b.w _paramzext16
%call = tail call i16 @paramzext16(i16 zeroext returned %x)
; Should make no difference if %x is used below rather than %call, but it does
%b = zext i16 %x to i32
%call2 = tail call i32 @identity32(i32 %b)
%call3 = tail call i16 @paramzext16(i16 zeroext returned %call)
ret i16 %call3
}
define i16 @test_matched_bothext(i16 %x) {
entry:
; CHECKELF-LABEL: test_matched_bothext:
; CHECKELF: uxth r0, r0
; CHECKELF: bl bothzext16
; CHECKELF-NOT: uxth r0, r0
; FIXME: Tail call should be OK here
; CHECKELF: bl identity32
; CHECKT2D-LABEL: test_matched_bothext:
; CHECKT2D: uxth r0, r0
; CHECKT2D: bl _bothzext16
; CHECKT2D-NOT: uxth r0, r0
; FIXME: Tail call should be OK here
; CHECKT2D: bl _identity32
%call = tail call i16 @bothzext16(i16 zeroext returned %x)
%b = zext i16 %x to i32
%call2 = tail call i32 @identity32(i32 returned %b)
ret i16 %call
}
define i16 @test_mismatched_bothext(i16 %x) {
entry:
; CHECKELF-LABEL: test_mismatched_bothext:
; CHECKELF: mov [[SAVEX:r[0-9]+]], r0
; CHECKELF: uxth r0, {{r[0-9]+}}
; CHECKELF: bl bothzext16
; CHECKELF: sxth r0, [[SAVEX]]
; CHECKELF: bl identity32
; CHECKELF: mov r0, [[SAVEX]]
; CHECKT2D-LABEL: test_mismatched_bothext:
; CHECKT2D: mov [[SAVEX:r[0-9]+]], r0
; CHECKT2D: uxth r0, {{r[0-9]+}}
; CHECKT2D: bl _bothzext16
; CHECKT2D: sxth r0, [[SAVEX]]
; CHECKT2D: bl _identity32
; CHECKT2D: mov r0, [[SAVEX]]
%call = tail call i16 @bothzext16(i16 zeroext returned %x)
%b = sext i16 %x to i32
%call2 = tail call i32 @identity32(i32 returned %b)
ret i16 %x
}
|
