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 -mtriple riscv32 < %s | FileCheck %s -check-prefix=RV32I-NOSW
; RUN: llc -mtriple riscv32 -enable-shrink-wrap < %s | FileCheck %s -check-prefix=RV32I-SW
; RUN: llc -mtriple riscv32 -enable-shrink-wrap -mattr=+save-restore < %s \
; RUN: | FileCheck %s -check-prefix=RV32I-SW-SR
declare void @abort()
define void @eliminate_restore(i32 %n) nounwind {
; RV32I-NOSW-LABEL: eliminate_restore:
; RV32I-NOSW: # %bb.0:
; RV32I-NOSW-NEXT: addi sp, sp, -16
; RV32I-NOSW-NEXT: sw ra, 12(sp)
; RV32I-NOSW-NEXT: addi a1, zero, 32
; RV32I-NOSW-NEXT: bgeu a1, a0, .LBB0_2
; RV32I-NOSW-NEXT: # %bb.1: # %if.end
; RV32I-NOSW-NEXT: lw ra, 12(sp)
; RV32I-NOSW-NEXT: addi sp, sp, 16
; RV32I-NOSW-NEXT: ret
; RV32I-NOSW-NEXT: .LBB0_2: # %if.then
; RV32I-NOSW-NEXT: call abort
;
; RV32I-SW-LABEL: eliminate_restore:
; RV32I-SW: # %bb.0:
; RV32I-SW-NEXT: addi a1, zero, 32
; RV32I-SW-NEXT: bgeu a1, a0, .LBB0_2
; RV32I-SW-NEXT: # %bb.1: # %if.end
; RV32I-SW-NEXT: ret
; RV32I-SW-NEXT: .LBB0_2: # %if.then
; RV32I-SW-NEXT: addi sp, sp, -16
; RV32I-SW-NEXT: sw ra, 12(sp)
; RV32I-SW-NEXT: call abort
;
; RV32I-SW-SR-LABEL: eliminate_restore:
; RV32I-SW-SR: # %bb.0:
; RV32I-SW-SR-NEXT: addi a1, zero, 32
; RV32I-SW-SR-NEXT: bgeu a1, a0, .LBB0_2
; RV32I-SW-SR-NEXT: # %bb.1: # %if.end
; RV32I-SW-SR-NEXT: ret
; RV32I-SW-SR-NEXT: .LBB0_2: # %if.then
; RV32I-SW-SR-NEXT: call t0, __riscv_save_0
; RV32I-SW-SR-NEXT: call abort
%cmp = icmp ule i32 %n, 32
br i1 %cmp, label %if.then, label %if.end
if.then:
call void @abort()
unreachable
if.end:
ret void
}
declare void @notdead(i8*)
define void @conditional_alloca(i32 %n) nounwind {
; RV32I-NOSW-LABEL: conditional_alloca:
; RV32I-NOSW: # %bb.0:
; RV32I-NOSW-NEXT: addi sp, sp, -16
; RV32I-NOSW-NEXT: sw ra, 12(sp)
; RV32I-NOSW-NEXT: sw s0, 8(sp)
; RV32I-NOSW-NEXT: addi s0, sp, 16
; RV32I-NOSW-NEXT: addi a1, zero, 32
; RV32I-NOSW-NEXT: bltu a1, a0, .LBB1_2
; RV32I-NOSW-NEXT: # %bb.1: # %if.then
; RV32I-NOSW-NEXT: addi a0, a0, 15
; RV32I-NOSW-NEXT: andi a0, a0, -16
; RV32I-NOSW-NEXT: sub a0, sp, a0
; RV32I-NOSW-NEXT: mv sp, a0
; RV32I-NOSW-NEXT: call notdead
; RV32I-NOSW-NEXT: .LBB1_2: # %if.end
; RV32I-NOSW-NEXT: addi sp, s0, -16
; RV32I-NOSW-NEXT: lw s0, 8(sp)
; RV32I-NOSW-NEXT: lw ra, 12(sp)
; RV32I-NOSW-NEXT: addi sp, sp, 16
; RV32I-NOSW-NEXT: ret
;
; RV32I-SW-LABEL: conditional_alloca:
; RV32I-SW: # %bb.0:
; RV32I-SW-NEXT: addi a1, zero, 32
; RV32I-SW-NEXT: bltu a1, a0, .LBB1_2
; RV32I-SW-NEXT: # %bb.1: # %if.then
; RV32I-SW-NEXT: addi sp, sp, -16
; RV32I-SW-NEXT: sw ra, 12(sp)
; RV32I-SW-NEXT: sw s0, 8(sp)
; RV32I-SW-NEXT: addi s0, sp, 16
; RV32I-SW-NEXT: addi a0, a0, 15
; RV32I-SW-NEXT: andi a0, a0, -16
; RV32I-SW-NEXT: sub a0, sp, a0
; RV32I-SW-NEXT: mv sp, a0
; RV32I-SW-NEXT: call notdead
; RV32I-SW-NEXT: addi sp, s0, -16
; RV32I-SW-NEXT: lw s0, 8(sp)
; RV32I-SW-NEXT: lw ra, 12(sp)
; RV32I-SW-NEXT: addi sp, sp, 16
; RV32I-SW-NEXT: .LBB1_2: # %if.end
; RV32I-SW-NEXT: ret
;
; RV32I-SW-SR-LABEL: conditional_alloca:
; RV32I-SW-SR: # %bb.0:
; RV32I-SW-SR-NEXT: addi a1, zero, 32
; RV32I-SW-SR-NEXT: bltu a1, a0, .LBB1_2
; RV32I-SW-SR-NEXT: # %bb.1: # %if.then
; RV32I-SW-SR-NEXT: call t0, __riscv_save_1
; RV32I-SW-SR-NEXT: addi s0, sp, 16
; RV32I-SW-SR-NEXT: addi a0, a0, 15
; RV32I-SW-SR-NEXT: andi a0, a0, -16
; RV32I-SW-SR-NEXT: sub a0, sp, a0
; RV32I-SW-SR-NEXT: mv sp, a0
; RV32I-SW-SR-NEXT: call notdead
; RV32I-SW-SR-NEXT: addi sp, s0, -16
; RV32I-SW-SR-NEXT: tail __riscv_restore_1
; RV32I-SW-SR-NEXT: .LBB1_2: # %if.end
; RV32I-SW-SR-NEXT: ret
%cmp = icmp ule i32 %n, 32
br i1 %cmp, label %if.then, label %if.end
if.then:
%addr = alloca i8, i32 %n
call void @notdead(i8* %addr)
br label %if.end
if.end:
ret void
}
|
