flt-rounds.ll
6.5 KB
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
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=-sse -verify-machineinstrs < %s | FileCheck %s -check-prefixes=X86,X86-NOSSE
; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=-sse2 -verify-machineinstrs < %s | FileCheck %s -check-prefixes=X86,X86-SSE
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -verify-machineinstrs < %s | FileCheck %s -check-prefixes=X64
declare i32 @llvm.flt.rounds()
define i32 @test_flt_rounds() nounwind {
; X86-LABEL: test_flt_rounds:
; X86: # %bb.0:
; X86-NEXT: subl $2, %esp
; X86-NEXT: fnstcw (%esp)
; X86-NEXT: movzwl (%esp), %ecx
; X86-NEXT: shrl $9, %ecx
; X86-NEXT: andb $6, %cl
; X86-NEXT: movl $45, %eax
; X86-NEXT: # kill: def $cl killed $cl killed $ecx
; X86-NEXT: shrl %cl, %eax
; X86-NEXT: andl $3, %eax
; X86-NEXT: addl $2, %esp
; X86-NEXT: retl
;
; X64-LABEL: test_flt_rounds:
; X64: # %bb.0:
; X64-NEXT: fnstcw -{{[0-9]+}}(%rsp)
; X64-NEXT: movzwl -{{[0-9]+}}(%rsp), %ecx
; X64-NEXT: shrl $9, %ecx
; X64-NEXT: andb $6, %cl
; X64-NEXT: movl $45, %eax
; X64-NEXT: # kill: def $cl killed $cl killed $ecx
; X64-NEXT: shrl %cl, %eax
; X64-NEXT: andl $3, %eax
; X64-NEXT: retq
%1 = call i32 @llvm.flt.rounds()
ret i32 %1
}
; Make sure we preserve order with fesetround.
define i32 @multiple_flt_rounds() nounwind {
; X86-LABEL: multiple_flt_rounds:
; X86: # %bb.0: # %entry
; X86-NEXT: pushl %ebx
; X86-NEXT: pushl %esi
; X86-NEXT: subl $20, %esp
; X86-NEXT: movl $1024, (%esp) # imm = 0x400
; X86-NEXT: calll fesetround
; X86-NEXT: fnstcw {{[0-9]+}}(%esp)
; X86-NEXT: movzwl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: shrl $9, %ecx
; X86-NEXT: andb $6, %cl
; X86-NEXT: movl $45, %esi
; X86-NEXT: movl $45, %eax
; X86-NEXT: # kill: def $cl killed $cl killed $ecx
; X86-NEXT: shrl %cl, %eax
; X86-NEXT: andl $3, %eax
; X86-NEXT: xorl %ebx, %ebx
; X86-NEXT: cmpl $3, %eax
; X86-NEXT: setne %bl
; X86-NEXT: movl $0, (%esp)
; X86-NEXT: calll fesetround
; X86-NEXT: fnstcw {{[0-9]+}}(%esp)
; X86-NEXT: movzwl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: shrl $9, %ecx
; X86-NEXT: andb $6, %cl
; X86-NEXT: movl $45, %eax
; X86-NEXT: # kill: def $cl killed $cl killed $ecx
; X86-NEXT: shrl %cl, %eax
; X86-NEXT: andl $3, %eax
; X86-NEXT: cmpl $1, %eax
; X86-NEXT: je .LBB1_2
; X86-NEXT: # %bb.1: # %entry
; X86-NEXT: incl %ebx
; X86-NEXT: .LBB1_2: # %entry
; X86-NEXT: movl $3072, (%esp) # imm = 0xC00
; X86-NEXT: calll fesetround
; X86-NEXT: fnstcw {{[0-9]+}}(%esp)
; X86-NEXT: movzwl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: shrl $9, %ecx
; X86-NEXT: andb $6, %cl
; X86-NEXT: movl $45, %eax
; X86-NEXT: # kill: def $cl killed $cl killed $ecx
; X86-NEXT: shrl %cl, %eax
; X86-NEXT: andl $3, %eax
; X86-NEXT: cmpl $1, %eax
; X86-NEXT: sbbl $-1, %ebx
; X86-NEXT: movl $2048, (%esp) # imm = 0x800
; X86-NEXT: calll fesetround
; X86-NEXT: fnstcw {{[0-9]+}}(%esp)
; X86-NEXT: movzwl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: shrl $9, %ecx
; X86-NEXT: andb $6, %cl
; X86-NEXT: # kill: def $cl killed $cl killed $ecx
; X86-NEXT: shrl %cl, %esi
; X86-NEXT: andl $3, %esi
; X86-NEXT: xorl %ecx, %ecx
; X86-NEXT: cmpl $2, %esi
; X86-NEXT: setne %cl
; X86-NEXT: negl %ecx
; X86-NEXT: xorl %eax, %eax
; X86-NEXT: cmpl %ecx, %ebx
; X86-NEXT: setne %al
; X86-NEXT: addl $20, %esp
; X86-NEXT: popl %esi
; X86-NEXT: popl %ebx
; X86-NEXT: retl
;
; X64-LABEL: multiple_flt_rounds:
; X64: # %bb.0: # %entry
; X64-NEXT: pushq %rbp
; X64-NEXT: pushq %r14
; X64-NEXT: pushq %rbx
; X64-NEXT: subq $16, %rsp
; X64-NEXT: movl $1024, %edi # imm = 0x400
; X64-NEXT: callq fesetround
; X64-NEXT: fnstcw {{[0-9]+}}(%rsp)
; X64-NEXT: movzwl {{[0-9]+}}(%rsp), %ecx
; X64-NEXT: shrl $9, %ecx
; X64-NEXT: andb $6, %cl
; X64-NEXT: movl $45, %r14d
; X64-NEXT: movl $45, %eax
; X64-NEXT: # kill: def $cl killed $cl killed $ecx
; X64-NEXT: shrl %cl, %eax
; X64-NEXT: andl $3, %eax
; X64-NEXT: xorl %ebx, %ebx
; X64-NEXT: cmpl $3, %eax
; X64-NEXT: setne %bl
; X64-NEXT: xorl %edi, %edi
; X64-NEXT: callq fesetround
; X64-NEXT: fnstcw {{[0-9]+}}(%rsp)
; X64-NEXT: movzwl {{[0-9]+}}(%rsp), %ecx
; X64-NEXT: shrl $9, %ecx
; X64-NEXT: andb $6, %cl
; X64-NEXT: movl $45, %eax
; X64-NEXT: # kill: def $cl killed $cl killed $ecx
; X64-NEXT: shrl %cl, %eax
; X64-NEXT: andl $3, %eax
; X64-NEXT: leal 1(%rbx), %ebp
; X64-NEXT: cmpl $1, %eax
; X64-NEXT: cmovel %ebx, %ebp
; X64-NEXT: movl $3072, %edi # imm = 0xC00
; X64-NEXT: callq fesetround
; X64-NEXT: fnstcw {{[0-9]+}}(%rsp)
; X64-NEXT: movzwl {{[0-9]+}}(%rsp), %ecx
; X64-NEXT: shrl $9, %ecx
; X64-NEXT: andb $6, %cl
; X64-NEXT: movl $45, %eax
; X64-NEXT: # kill: def $cl killed $cl killed $ecx
; X64-NEXT: shrl %cl, %eax
; X64-NEXT: andl $3, %eax
; X64-NEXT: cmpl $1, %eax
; X64-NEXT: sbbl $-1, %ebp
; X64-NEXT: movl $2048, %edi # imm = 0x800
; X64-NEXT: callq fesetround
; X64-NEXT: fnstcw {{[0-9]+}}(%rsp)
; X64-NEXT: movzwl {{[0-9]+}}(%rsp), %ecx
; X64-NEXT: shrl $9, %ecx
; X64-NEXT: andb $6, %cl
; X64-NEXT: # kill: def $cl killed $cl killed $ecx
; X64-NEXT: shrl %cl, %r14d
; X64-NEXT: andl $3, %r14d
; X64-NEXT: xorl %ecx, %ecx
; X64-NEXT: cmpl $2, %r14d
; X64-NEXT: setne %cl
; X64-NEXT: negl %ecx
; X64-NEXT: xorl %eax, %eax
; X64-NEXT: cmpl %ecx, %ebp
; X64-NEXT: setne %al
; X64-NEXT: addq $16, %rsp
; X64-NEXT: popq %rbx
; X64-NEXT: popq %r14
; X64-NEXT: popq %rbp
; X64-NEXT: retq
entry:
%call = tail call i32 @fesetround(i32 1024)
%0 = tail call i32 @llvm.flt.rounds()
%cmp = icmp ne i32 %0, 3
%spec.select = zext i1 %cmp to i32
%call1 = tail call i32 @fesetround(i32 0)
%1 = tail call i32 @llvm.flt.rounds()
%cmp2 = icmp eq i32 %1, 1
%inc4 = select i1 %cmp, i32 2, i32 1
%errs.1 = select i1 %cmp2, i32 %spec.select, i32 %inc4
%call6 = tail call i32 @fesetround(i32 3072)
%2 = tail call i32 @llvm.flt.rounds()
%cmp7 = icmp ne i32 %2, 0
%inc9 = zext i1 %cmp7 to i32
%spec.select22 = add nuw nsw i32 %errs.1, %inc9
%call11 = tail call i32 @fesetround(i32 2048)
%3 = tail call i32 @llvm.flt.rounds()
%cmp12 = icmp ne i32 %3, 2
%inc14.neg = sext i1 %cmp12 to i32
%cmp16 = icmp ne i32 %spec.select22, %inc14.neg
%cond = zext i1 %cmp16 to i32
ret i32 %cond
}
; Function Attrs: nounwind
declare dso_local i32 @fesetround(i32) local_unnamed_addr #1