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
| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i386-unknown-linux-gnu | FileCheck %s --check-prefix=X86
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s --check-prefix=X64
@a = common global i32 0, align 4
@b = common global i32 0, align 4
@c = common global i32 0, align 4
@e = common global i32 0, align 4
@x = common global i32 0, align 4
@f = common global i32 0, align 4
@h = common global i32 0, align 4
@i = common global i32 0, align 4
; Test -Os to make sure immediates with multiple users don't get pulled in to
; instructions.
define i32 @foo() optsize {
; X86-LABEL: foo:
; X86: # %bb.0: # %entry
; X86-NEXT: movl $1234, %eax # imm = 0x4D2
; X86-NEXT: movl %eax, a
; X86-NEXT: movl %eax, b
; X86-NEXT: movl $12, %eax
; X86-NEXT: movl %eax, c
; X86-NEXT: cmpl %eax, e
; X86-NEXT: jne .LBB0_2
; X86-NEXT: # %bb.1: # %if.then
; X86-NEXT: movl $1, x
; X86-NEXT: .LBB0_2: # %if.end
; X86-NEXT: movl $1234, f # imm = 0x4D2
; X86-NEXT: movl $555, %eax # imm = 0x22B
; X86-NEXT: movl %eax, h
; X86-NEXT: addl %eax, i
; X86-NEXT: xorl %eax, %eax
; X86-NEXT: retl
;
; X64-LABEL: foo:
; X64: # %bb.0: # %entry
; X64-NEXT: movl $1234, %eax # imm = 0x4D2
; X64-NEXT: movl %eax, {{.*}}(%rip)
; X64-NEXT: movl %eax, {{.*}}(%rip)
; X64-NEXT: movl $12, %eax
; X64-NEXT: movl %eax, {{.*}}(%rip)
; X64-NEXT: cmpl %eax, {{.*}}(%rip)
; X64-NEXT: jne .LBB0_2
; X64-NEXT: # %bb.1: # %if.then
; X64-NEXT: movl $1, {{.*}}(%rip)
; X64-NEXT: .LBB0_2: # %if.end
; X64-NEXT: movl $1234, {{.*}}(%rip) # imm = 0x4D2
; X64-NEXT: movl $555, %eax # imm = 0x22B
; X64-NEXT: movl %eax, {{.*}}(%rip)
; X64-NEXT: addl %eax, {{.*}}(%rip)
; X64-NEXT: xorl %eax, %eax
; X64-NEXT: retq
entry:
store i32 1234, i32* @a
store i32 1234, i32* @b
store i32 12, i32* @c
%0 = load i32, i32* @e
%cmp = icmp eq i32 %0, 12
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
store i32 1, i32* @x
br label %if.end
; New block.. Make sure 1234 isn't live across basic blocks from before.
if.end: ; preds = %if.then, %entry
store i32 1234, i32* @f
store i32 555, i32* @h
%1 = load i32, i32* @i
%add1 = add nsw i32 %1, 555
store i32 %add1, i32* @i
ret i32 0
}
; Test -O2 to make sure that all immediates get pulled in to their users.
define i32 @foo2() {
; X86-LABEL: foo2:
; X86: # %bb.0: # %entry
; X86-NEXT: movl $1234, a # imm = 0x4D2
; X86-NEXT: movl $1234, b # imm = 0x4D2
; X86-NEXT: xorl %eax, %eax
; X86-NEXT: retl
;
; X64-LABEL: foo2:
; X64: # %bb.0: # %entry
; X64-NEXT: movl $1234, {{.*}}(%rip) # imm = 0x4D2
; X64-NEXT: movl $1234, {{.*}}(%rip) # imm = 0x4D2
; X64-NEXT: xorl %eax, %eax
; X64-NEXT: retq
entry:
store i32 1234, i32* @a
store i32 1234, i32* @b
ret i32 0
}
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i1) #1
@AA = common global [100 x i8] zeroinitializer, align 1
; memset gets lowered in DAG. Constant merging should hoist all the
; immediates used to store to the individual memory locations. Make
; sure we don't directly store the immediates.
define void @foomemset() optsize {
; X86-LABEL: foomemset:
; X86: # %bb.0: # %entry
; X86-NEXT: movl $555819297, %eax # imm = 0x21212121
; X86-NEXT: movl %eax, AA+20
; X86-NEXT: movl %eax, AA+16
; X86-NEXT: movl %eax, AA+12
; X86-NEXT: movl %eax, AA+8
; X86-NEXT: movl %eax, AA+4
; X86-NEXT: movl %eax, AA
; X86-NEXT: retl
;
; X64-LABEL: foomemset:
; X64: # %bb.0: # %entry
; X64-NEXT: movabsq $2387225703656530209, %rax # imm = 0x2121212121212121
; X64-NEXT: movq %rax, AA+{{.*}}(%rip)
; X64-NEXT: movq %rax, AA+{{.*}}(%rip)
; X64-NEXT: movq %rax, {{.*}}(%rip)
; X64-NEXT: retq
entry:
call void @llvm.memset.p0i8.i32(i8* getelementptr inbounds ([100 x i8], [100 x i8]* @AA, i32 0, i32 0), i8 33, i32 24, i1 false)
ret void
}
|