forked from rust-lang/rust
-
Notifications
You must be signed in to change notification settings - Fork 3
/
Copy pathx86-return-float.rs
328 lines (299 loc) · 10.5 KB
/
x86-return-float.rs
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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
//@ assembly-output: emit-asm
//@ only-x86
// FIXME(#114479): LLVM miscompiles loading and storing `f32` and `f64` when SSE is disabled.
// There's no compiletest directive to ignore a test on i586 only, so just always explicitly enable
// SSE2.
// Use the same target CPU as `i686` so that LLVM orders the instructions in the same order.
//@ compile-flags: -Ctarget-feature=+sse2 -Ctarget-cpu=pentium4
// Force frame pointers to make ASM more consistent between targets
//@ compile-flags: -O -C force-frame-pointers
//@ filecheck-flags: --implicit-check-not fld --implicit-check-not fst
//@ revisions: normal win
//@[normal] ignore-windows
//@[win] only-windows
#![crate_type = "lib"]
#![feature(f16, f128)]
// Tests that returning `f32` and `f64` with the "Rust" ABI on 32-bit x86 doesn't use the x87
// floating point stack, as loading and storing `f32`s and `f64`s to and from the x87 stack quietens
// signalling NaNs.
// Returning individual floats
// CHECK-LABEL: return_f32:
#[no_mangle]
pub fn return_f32(x: f32) -> f32 {
// CHECK: movl {{.*}}(%ebp), %eax
// CHECK-NOT: ax
// CHECK: retl
x
}
// CHECK-LABEL: return_f64:
#[no_mangle]
pub fn return_f64(x: f64) -> f64 {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+4]](%ebp), %[[VAL:.*]]
// CHECK-NEXT: movsd %[[VAL]], (%[[PTR]])
// CHECK: retl
x
}
// Returning scalar pairs containing floats
// CHECK-LABEL: return_f32_f32:
#[no_mangle]
pub fn return_f32_f32(x: (f32, f32)) -> (f32, f32) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movss %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movss %[[VAL2]], 4(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_f64_f64:
#[no_mangle]
pub fn return_f64_f64(x: (f64, f64)) -> (f64, f64) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+12]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movsd %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movsd %[[VAL2]], 8(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_f32_f64:
#[no_mangle]
pub fn return_f32_f64(x: (f32, f64)) -> (f32, f64) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movss %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movsd %[[VAL2]], {{4|8}}(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_f64_f32:
#[no_mangle]
pub fn return_f64_f32(x: (f64, f32)) -> (f64, f32) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+12]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movsd %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movss %[[VAL2]], 8(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_f32_other:
#[no_mangle]
pub fn return_f32_other(x: (f32, usize)) -> (f32, usize) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movss %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movl %[[VAL2]], 4(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_f64_other:
#[no_mangle]
pub fn return_f64_other(x: (f64, usize)) -> (f64, usize) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+12]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movsd %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movl %[[VAL2]], 8(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_other_f32:
#[no_mangle]
pub fn return_other_f32(x: (usize, f32)) -> (usize, f32) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movl %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movss %[[VAL2]], 4(%[[PTR]])
// CHECK: retl
x
}
// CHECK-LABEL: return_other_f64:
#[no_mangle]
pub fn return_other_f64(x: (usize, f64)) -> (usize, f64) {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movsd [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movl %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movsd %[[VAL2]], {{4|8}}(%[[PTR]])
// CHECK: retl
x
}
// Calling functions returning floats
// CHECK-LABEL: call_f32:
#[no_mangle]
pub unsafe fn call_f32(x: &mut f32) {
extern "Rust" {
fn get_f32() -> f32;
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f32
// CHECK-NEXT: movl %eax, (%[[PTR]])
*x = get_f32();
}
// CHECK-LABEL: call_f64:
#[no_mangle]
pub unsafe fn call_f64(x: &mut f64) {
extern "Rust" {
fn get_f64() -> f64;
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f64
// CHECK: movsd {{.*}}(%{{ebp|esp}}), %[[VAL:.*]]
// CHECK-NEXT: movsd %[[VAL:.*]], (%[[PTR]])
*x = get_f64();
}
// Calling functions returning scalar pairs containing floats
// CHECK-LABEL: call_f32_f32:
#[no_mangle]
pub unsafe fn call_f32_f32(x: &mut (f32, f32)) {
extern "Rust" {
fn get_f32_f32() -> (f32, f32);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f32_f32
// CHECK: movss [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+4]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movss %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movss %[[VAL2]], 4(%[[PTR]])
*x = get_f32_f32();
}
// CHECK-LABEL: call_f64_f64:
#[no_mangle]
pub unsafe fn call_f64_f64(x: &mut (f64, f64)) {
extern "Rust" {
fn get_f64_f64() -> (f64, f64);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f64_f64
// normal: movsd [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// normal-NEXT: movsd [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// win: movsd (%esp), %[[VAL1:.*]]
// win-NEXT: movsd 8(%esp), %[[VAL2:.*]]
// CHECK-NEXT: movsd %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movsd %[[VAL2]], 8(%[[PTR]])
*x = get_f64_f64();
}
// CHECK-LABEL: call_f32_f64:
#[no_mangle]
pub unsafe fn call_f32_f64(x: &mut (f32, f64)) {
extern "Rust" {
fn get_f32_f64() -> (f32, f64);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f32_f64
// normal: movss [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// normal-NEXT: movsd [[#%d,OFFSET+4]](%ebp), %[[VAL2:.*]]
// win: movss (%esp), %[[VAL1:.*]]
// win-NEXT: movsd 8(%esp), %[[VAL2:.*]]
// CHECK-NEXT: movss %[[VAL1]], (%[[PTR]])
// normal-NEXT: movsd %[[VAL2]], 4(%[[PTR]])
// win-NEXT: movsd %[[VAL2]], 8(%[[PTR]])
*x = get_f32_f64();
}
// CHECK-LABEL: call_f64_f32:
#[no_mangle]
pub unsafe fn call_f64_f32(x: &mut (f64, f32)) {
extern "Rust" {
fn get_f64_f32() -> (f64, f32);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f64_f32
// normal: movsd [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// normal-NEXT: movss [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// win: movsd (%esp), %[[VAL1:.*]]
// win-NEXT: movss 8(%esp), %[[VAL2:.*]]
// CHECK-NEXT: movsd %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movss %[[VAL2]], 8(%[[PTR]])
*x = get_f64_f32();
}
// CHECK-LABEL: call_f32_other:
#[no_mangle]
pub unsafe fn call_f32_other(x: &mut (f32, usize)) {
extern "Rust" {
fn get_f32_other() -> (f32, usize);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f32_other
// CHECK: movss [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+4]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movss %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movl %[[VAL2]], 4(%[[PTR]])
*x = get_f32_other();
}
// CHECK-LABEL: call_f64_other:
#[no_mangle]
pub unsafe fn call_f64_other(x: &mut (f64, usize)) {
extern "Rust" {
fn get_f64_other() -> (f64, usize);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_f64_other
// normal: movsd [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// normal-NEXT: movl [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// win: movsd (%esp), %[[VAL1:.*]]
// win-NEXT: movl 8(%esp), %[[VAL2:.*]]
// CHECK-NEXT: movsd %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movl %[[VAL2]], 8(%[[PTR]])
*x = get_f64_other();
}
// CHECK-LABEL: call_other_f32:
#[no_mangle]
pub unsafe fn call_other_f32(x: &mut (usize, f32)) {
extern "Rust" {
fn get_other_f32() -> (usize, f32);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_other_f32
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movss [[#%d,OFFSET+4]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movl %[[VAL1]], (%[[PTR]])
// CHECK-NEXT: movss %[[VAL2]], 4(%[[PTR]])
*x = get_other_f32();
}
// CHECK-LABEL: call_other_f64:
#[no_mangle]
pub unsafe fn call_other_f64(x: &mut (usize, f64)) {
extern "Rust" {
fn get_other_f64() -> (usize, f64);
}
// CHECK: movl {{.*}}(%ebp), %[[PTR:.*]]
// CHECK: calll {{()|_}}get_other_f64
// normal: movl [[#%d,OFFSET:]](%ebp), %[[VAL1:.*]]
// normal-NEXT: movsd [[#%d,OFFSET+4]](%ebp), %[[VAL2:.*]]
// win: movl (%esp), %[[VAL1:.*]]
// win-NEXT: movsd 8(%esp), %[[VAL2:.*]]
// CHECK-NEXT: movl %[[VAL1]], (%[[PTR]])
// normal-NEXT: movsd %[[VAL2]], 4(%[[PTR]])
// win-NEXT: movsd %[[VAL2]], 8(%[[PTR]])
*x = get_other_f64();
}
// The "C" ABI for `f16` and `f128` on x86 has never used the x87 floating point stack. Do some
// basic checks to ensure this remains the case for the "Rust" ABI.
// CHECK-LABEL: return_f16:
#[no_mangle]
pub fn return_f16(x: f16) -> f16 {
// CHECK: pinsrw $0, {{.*}}(%ebp), %xmm0
// CHECK-NOT: xmm0
// CHECK: retl
x
}
// CHECK-LABEL: return_f128:
#[no_mangle]
pub fn return_f128(x: f128) -> f128 {
// CHECK: movl [[#%d,OFFSET:]](%ebp), %[[PTR:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+16]](%ebp), %[[VAL4:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+4]](%ebp), %[[VAL1:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+8]](%ebp), %[[VAL2:.*]]
// CHECK-NEXT: movl [[#%d,OFFSET+12]](%ebp), %[[VAL3:.*]]
// CHECK-NEXT: movl %[[VAL4:.*]] 12(%[[PTR]])
// CHECK-NEXT: movl %[[VAL3:.*]] 8(%[[PTR]])
// CHECK-NEXT: movl %[[VAL2:.*]] 4(%[[PTR]])
// CHECK-NEXT: movl %[[VAL1:.*]] (%[[PTR]])
// CHECK: retl
x
}