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
329
330
331
332
333
334
335
336
337
338
339
340
341
342
|
; RUN: llc < %s -mcpu=generic -mtriple=i386-apple-darwin | FileCheck %s
; There should be no stack manipulations between the inline asm and ret.
; CHECK: test1
; CHECK: InlineAsm End
; CHECK-NEXT: ret
define x86_fp80 @test1() {
%tmp85 = call x86_fp80 asm sideeffect "fld0", "={st(0)}"()
ret x86_fp80 %tmp85
}
; CHECK: test2
; CHECK: InlineAsm End
; CHECK-NEXT: ret
define double @test2() {
%tmp85 = call double asm sideeffect "fld0", "={st(0)}"()
ret double %tmp85
}
; Setting up argument in st(0) should be a single fld.
; CHECK: test3
; CHECK: fld
; CHECK-NEXT: InlineAsm Start
; Asm consumes stack, nothing should be popped.
; CHECK: InlineAsm End
; CHECK-NOT: fstp
; CHECK: ret
define void @test3(x86_fp80 %X) {
call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( x86_fp80 %X)
ret void
}
; CHECK: test4
; CHECK: fld
; CHECK-NEXT: InlineAsm Start
; CHECK: InlineAsm End
; CHECK-NOT: fstp
; CHECK: ret
define void @test4(double %X) {
call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( double %X)
ret void
}
; Same as test3/4, but using value from fadd.
; The fadd can be done in xmm or x87 regs - we don't test that.
; CHECK: test5
; CHECK: InlineAsm End
; CHECK-NOT: fstp
; CHECK: ret
define void @test5(double %X) {
%Y = fadd double %X, 123.0
call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( double %Y)
ret void
}
; CHECK: test6
define void @test6(double %A, double %B, double %C,
double %D, double %E) nounwind {
entry:
; Uses the same value twice, should have one fstp after the asm.
; CHECK: foo
; CHECK: InlineAsm End
; CHECK-NEXT: fstp
; CHECK-NOT: fstp
tail call void asm sideeffect "foo $0 $1", "f,f,~{dirflag},~{fpsr},~{flags}"( double %A, double %A ) nounwind
; Uses two different values, should be in st(0)/st(1) and both be popped.
; CHECK: bar
; CHECK: InlineAsm End
; CHECK-NEXT: fstp
; CHECK-NEXT: fstp
tail call void asm sideeffect "bar $0 $1", "f,f,~{dirflag},~{fpsr},~{flags}"( double %B, double %C ) nounwind
; Uses two different values, one of which isn't killed in this asm, it
; should not be popped after the asm.
; CHECK: baz
; CHECK: InlineAsm End
; CHECK-NEXT: fstp
; CHECK-NOT: fstp
tail call void asm sideeffect "baz $0 $1", "f,f,~{dirflag},~{fpsr},~{flags}"( double %D, double %E ) nounwind
; This is the last use of %D, so it should be popped after.
; CHECK: baz
; CHECK: InlineAsm End
; CHECK-NEXT: fstp
; CHECK-NOT: fstp
; CHECK: ret
tail call void asm sideeffect "baz $0", "f,~{dirflag},~{fpsr},~{flags}"( double %D ) nounwind
ret void
}
; PR4185
; Passing a non-killed value to asm in {st}.
; Make sure it is duped before.
; asm kills st(0), so we shouldn't pop anything
; CHECK: testPR4185
; CHECK: fld %st(0)
; CHECK: fistpl
; CHECK-NOT: fstp
; CHECK: fistpl
; CHECK-NOT: fstp
; CHECK: ret
; A valid alternative would be to remat the constant pool load before each
; inline asm.
define void @testPR4185() {
return:
call void asm sideeffect "fistpl $0", "{st},~{st}"(double 1.000000e+06)
call void asm sideeffect "fistpl $0", "{st},~{st}"(double 1.000000e+06)
ret void
}
; Passing a non-killed value through asm in {st}.
; Make sure it is not duped before.
; Second asm kills st(0), so we shouldn't pop anything
; CHECK: testPR4185b
; CHECK-NOT: fld %st(0)
; CHECK: fistl
; CHECK-NOT: fstp
; CHECK: fistpl
; CHECK-NOT: fstp
; CHECK: ret
; A valid alternative would be to remat the constant pool load before each
; inline asm.
define void @testPR4185b() {
return:
call void asm sideeffect "fistl $0", "{st}"(double 1.000000e+06)
call void asm sideeffect "fistpl $0", "{st},~{st}"(double 1.000000e+06)
ret void
}
; PR4459
; The return value from ceil must be duped before being consumed by asm.
; CHECK: testPR4459
; CHECK: ceil
; CHECK: fld %st(0)
; CHECK-NOT: fxch
; CHECK: fistpl
; CHECK-NOT: fxch
; CHECK: fstpt
; CHECK: test
define void @testPR4459(x86_fp80 %a) {
entry:
%0 = call x86_fp80 @ceil(x86_fp80 %a)
call void asm sideeffect "fistpl $0", "{st},~{st}"( x86_fp80 %0)
call void @test3(x86_fp80 %0 )
ret void
}
declare x86_fp80 @ceil(x86_fp80)
; PR4484
; test1 leaves a value on the stack that is needed after the asm.
; CHECK: testPR4484
; CHECK: calll _test1
; CHECK-NOT: fstp
; Load %a from stack after ceil
; CHECK: fldt
; CHECK-NOT: fxch
; CHECK: fistpl
; CHECK-NOT: fstp
; Set up call to test.
; CHECK: fstpt
; CHECK: test
define void @testPR4484(x86_fp80 %a) {
entry:
%0 = call x86_fp80 @test1()
call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %a)
call void @test3(x86_fp80 %0)
ret void
}
; PR4485
; CHECK: testPR4485
define void @testPR4485(x86_fp80* %a) {
entry:
%0 = load x86_fp80* %a, align 16
%1 = fmul x86_fp80 %0, 0xK4006B400000000000000
%2 = fmul x86_fp80 %1, 0xK4012F424000000000000
tail call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %2)
%3 = load x86_fp80* %a, align 16
%4 = fmul x86_fp80 %3, 0xK4006B400000000000000
%5 = fmul x86_fp80 %4, 0xK4012F424000000000000
tail call void asm sideeffect "fistpl $0", "{st},~{st}"(x86_fp80 %5)
ret void
}
; An input argument in a fixed position is implicitly popped by the asm only if
; the input argument is tied to an output register, or it is in the clobber list.
; The clobber list case is tested above.
;
; This doesn't implicitly pop the stack:
;
; void fist1(long double x, int *p) {
; asm volatile ("fistl %1" : : "t"(x), "m"(*p));
; }
;
; CHECK: fist1
; CHECK: fldt
; CHECK: fistl (%e
; CHECK: fstp
; CHECK: ret
define void @fist1(x86_fp80 %x, i32* %p) nounwind ssp {
entry:
tail call void asm sideeffect "fistl $1", "{st},*m,~{memory},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, i32* %p) nounwind
ret void
}
; Here, the input operand is tied to an output which means that is is
; implicitly popped (and then the output is implicitly pushed).
;
; long double fist2(long double x, int *p) {
; long double y;
; asm ("fistl %1" : "=&t"(y) : "0"(x), "m"(*p) : "memory");
; return y;
; }
;
; CHECK: fist2
; CHECK: fldt
; CHECK: fistl (%e
; CHECK-NOT: fstp
; CHECK: ret
define x86_fp80 @fist2(x86_fp80 %x, i32* %p) nounwind ssp {
entry:
%0 = tail call x86_fp80 asm "fistl $2", "=&{st},0,*m,~{memory},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, i32* %p) nounwind
ret x86_fp80 %0
}
; An 'f' constraint is never implicitly popped:
;
; void fucomp1(long double x, long double y) {
; asm volatile ("fucomp %1" : : "t"(x), "f"(y) : "st");
; }
; CHECK: fucomp1
; CHECK: fldt
; CHECK: fldt
; CHECK: fucomp %st
; CHECK: fstp
; CHECK-NOT: fstp
; CHECK: ret
define void @fucomp1(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
entry:
tail call void asm sideeffect "fucomp $1", "{st},f,~{st},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
ret void
}
; The 'u' constraint is only popped implicitly when clobbered:
;
; void fucomp2(long double x, long double y) {
; asm volatile ("fucomp %1" : : "t"(x), "u"(y) : "st");
; }
;
; void fucomp3(long double x, long double y) {
; asm volatile ("fucompp %1" : : "t"(x), "u"(y) : "st", "st(1)");
; }
;
; CHECK: fucomp2
; CHECK: fldt
; CHECK: fldt
; CHECK: fucomp %st(1)
; CHECK: fstp
; CHECK-NOT: fstp
; CHECK: ret
;
; CHECK: fucomp3
; CHECK: fldt
; CHECK: fldt
; CHECK: fucompp %st(1)
; CHECK-NOT: fstp
; CHECK: ret
define void @fucomp2(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
entry:
tail call void asm sideeffect "fucomp $1", "{st},{st(1)},~{st},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
ret void
}
define void @fucomp3(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
entry:
tail call void asm sideeffect "fucompp $1", "{st},{st(1)},~{st},~{st(1)},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
ret void
}
; One input, two outputs, one dead output.
%complex = type { float, float }
; CHECK: sincos1
; CHECK: flds
; CHECK-NOT: fxch
; CHECK: sincos
; CHECK-NOT: fstp
; CHECK: fstp %st(1)
; CHECK-NOT: fstp
; CHECK: ret
define float @sincos1(float %x) nounwind ssp {
entry:
%0 = tail call %complex asm "sincos", "={st},={st(1)},0,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
%asmresult = extractvalue %complex %0, 0
ret float %asmresult
}
; Same thing, swapped output operands.
; CHECK: sincos2
; CHECK: flds
; CHECK-NOT: fxch
; CHECK: sincos
; CHECK-NOT: fstp
; CHECK: fstp %st(1)
; CHECK-NOT: fstp
; CHECK: ret
define float @sincos2(float %x) nounwind ssp {
entry:
%0 = tail call %complex asm "sincos", "={st(1)},={st},1,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
%asmresult = extractvalue %complex %0, 1
ret float %asmresult
}
; Clobber st(0) after it was live-out/dead from the previous asm.
; CHECK: sincos3
; Load x, make a copy for the second asm.
; CHECK: flds
; CHECK: fld %st(0)
; CHECK: sincos
; Discard dead result in st(0), bring x to the top.
; CHECK: fstp %st(0)
; CHECK: fxch
; x is now in st(0) for the second asm
; CHECK: sincos
; Discard both results.
; CHECK: fstp
; CHECK: fstp
; CHECK: ret
define float @sincos3(float %x) nounwind ssp {
entry:
%0 = tail call %complex asm sideeffect "sincos", "={st(1)},={st},1,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
%1 = tail call %complex asm sideeffect "sincos", "={st(1)},={st},1,~{dirflag},~{fpsr},~{flags}"(float %x) nounwind
%asmresult = extractvalue %complex %0, 0
ret float %asmresult
}
; Pass the same value in two fixed stack slots.
; CHECK: PR10602
; CHECK: flds LCPI
; CHECK: fld %st(0)
; CHECK: fcomi %st(1), %st(0)
define i32 @PR10602() nounwind ssp {
entry:
%0 = tail call i32 asm "fcomi $2, $1; pushf; pop $0", "=r,{st},{st(1)},~{dirflag},~{fpsr},~{flags}"(double 2.000000e+00, double 2.000000e+00) nounwind
ret i32 %0
}
|
