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
|
# RUN: llc -mtriple=i386-unknown-linux-gnu -mcpu=slm -run-pass post-RA-sched -o - %s | FileCheck %s
#
# Verify that the critical antidependence breaker does not consider
# a high byte register as available as a replacement register
# in a certain context.
--- |
define void @main() { ret void }
...
---
# CHECK-LABEL: main
name: main
tracksRegLiveness: true
frameInfo:
stackSize: 52
fixedStack:
- { id: 0, type: spill-slot, offset: -20, size: 4, alignment: 4, callee-saved-register: '%esi' }
- { id: 1, type: spill-slot, offset: -16, size: 4, alignment: 4, callee-saved-register: '%edi' }
- { id: 2, type: spill-slot, offset: -12, size: 4, alignment: 4, callee-saved-register: '%ebx' }
- { id: 3, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '%ebp' }
stack:
- { id: 0, type: spill-slot, offset: -53, size: 1, alignment: 1 }
- { id: 1, type: spill-slot, offset: -48, size: 4, alignment: 4 }
- { id: 2, type: spill-slot, offset: -32, size: 4, alignment: 4 }
body: |
bb.0:
liveins: %ebp, %ebx, %edi, %esi
frame-setup PUSH32r killed %ebp, implicit-def %esp, implicit %esp
frame-setup PUSH32r killed %ebx, implicit-def %esp, implicit %esp
frame-setup PUSH32r killed %edi, implicit-def %esp, implicit %esp
frame-setup PUSH32r killed %esi, implicit-def %esp, implicit %esp
%esp = frame-setup SUB32ri8 %esp, 36, implicit-def dead %eflags
%eax = MOV32ri 1
%ebp = MOV32ri 2
%ebx = MOV32ri 3
%ecx = MOV32ri 4
%edi = MOV32ri 5
%edx = MOV32ri 6
bb.1:
liveins: %eax, %ebp, %ebx, %ecx, %edi, %edx
%ebp = SHR32rCL killed %ebp, implicit-def dead %eflags, implicit %cl
%ebp = XOR32rr killed %ebp, killed %ebx, implicit-def dead %eflags
TEST32rr %edx, %edx, implicit-def %eflags
%cl = SETNEr implicit %eflags
; This %bl def is antidependent on the above use of %ebx
%bl = MOV8rm %esp, 1, _, 3, _ ; :: (load 1 from %stack.0)
%cl = OR8rr killed %cl, %bl, implicit-def dead %eflags
%esi = MOVZX32rr8 killed %cl
%esi = ADD32rr killed %esi, killed %edi, implicit-def dead %eflags
%ecx = MOV32rm %esp, 1, _, 24, _ ; :: (load 4 from %stack.2)
%edx = SAR32rCL killed %edx, implicit-def dead %eflags, implicit %cl
TEST32rr killed %edx, %edx, implicit-def %eflags
%cl = SETNEr implicit %eflags
; Verify that removal of the %bl antidependence does not use %ch
; as a replacement register.
; CHECK: %cl = AND8rr killed %cl, killed %b
%cl = AND8rr killed %cl, killed %bl, implicit-def dead %eflags
CMP32ri8 %ebp, -1, implicit-def %eflags
%edx = MOV32ri 0
JE_1 %bb.3, implicit %eflags
bb.2:
liveins: %cl, %eax, %ebp, %esi
OR32mr %esp, 1, _, 8, _, killed %eax, implicit-def %eflags ; :: (store 4 into %stack.1)
%dl = SETNEr implicit %eflags, implicit-def %edx
bb.3:
liveins: %cl, %ebp, %edx, %esi
%eax = XOR32rr undef %eax, undef %eax, implicit-def dead %eflags
%esp = ADD32ri8 %esp, 36, implicit-def dead %eflags
%esi = POP32r implicit-def %esp, implicit %esp
%edi = POP32r implicit-def %esp, implicit %esp
%ebx = POP32r implicit-def %esp, implicit %esp
%ebp = POP32r implicit-def %esp, implicit %esp
RET 0, %eax
...
|
