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
|
# RUN: llc -mtriple=hexagon -run-pass pipeliner -debug-only=pipeliner %s -o /dev/null 2>&1 -pipeliner-experimental-cg=true | FileCheck %s
# REQUIRES: asserts
# Test that loop carried memory dependences are computed correctly.
# The original code is as follows.
#
# ```
# void f(int *a, int n) {
# for (int i = 0; i < n-2; i++) {
# a[i] += a[i+10];
# a[i+2] += i;
# }
# }
# ```
#
# Here is what each instruction does.
# SU(2): Load a[i+10]
# SU(3): Store it to a[i]
# SU(4): Load a[i+2], add i, then store it
#
# FIXME: Currently the following dependencies are missed.
#
# CHECK: ===== Loop Carried Edges Begin =====
# CHECK-NEXT: Loop carried edges from SU(2)
# CHECK-NEXT: Order
# CHECK-NEXT: SU(3)
# CHECK-NEXT: SU(4)
# CHECK-NEXT: Loop carried edges from SU(4)
# CHECK-NEXT: Order
# CHECK-NEXT: SU(3)
# CHECK-NEXT: ===== Loop Carried Edges End =====
--- |
define dso_local void @f(ptr nocapture noundef %a, i32 noundef %n) {
entry:
%cmp13 = icmp sgt i32 %n, 2
br i1 %cmp13, label %for.body.preheader, label %for.cond.cleanup
for.body.preheader:
%0 = add i32 %n, -2
br label %for.body
for.cond.cleanup:
ret void
for.body:
%lsr.iv15 = phi ptr [ %a, %for.body.preheader ], [ %cgep19, %for.body ]
%lsr.iv = phi i32 [ %0, %for.body.preheader ], [ %lsr.iv.next, %for.body ]
%i.014 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
%cgep = getelementptr i8, ptr %lsr.iv15, i32 40
%1 = load i32, ptr %cgep, align 4, !tbaa !5
%2 = load i32, ptr %lsr.iv15, align 4, !tbaa !5
%add2 = add nsw i32 %2, %1
store i32 %add2, ptr %lsr.iv15, align 4, !tbaa !5
%cgep18 = getelementptr i8, ptr %lsr.iv15, i32 8
%3 = load i32, ptr %cgep18, align 4, !tbaa !5
%4 = add i32 %i.014, %3
store i32 %4, ptr %cgep18, align 4, !tbaa !5
%inc = add nuw nsw i32 %i.014, 1
%lsr.iv.next = add i32 %lsr.iv, -1
%exitcond.not = icmp eq i32 %lsr.iv.next, 0
%cgep19 = getelementptr i8, ptr %lsr.iv15, i32 4
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
...
---
name: f
tracksRegLiveness: true
body: |
bb.0.entry:
successors: %bb.1, %bb.2
liveins: $r0, $r1
%8:intregs = COPY $r1
%7:intregs = COPY $r0
%9:predregs = C2_cmpgti %8, 2
J2_jumpf %9, %bb.2, implicit-def dead $pc
J2_jump %bb.1, implicit-def dead $pc
bb.1.for.body.preheader:
%0:intregs = A2_addi %8, -2
%11:intregs = A2_tfrsi 0
%14:intregs = COPY %0
J2_loop0r %bb.3, %14, implicit-def $lc0, implicit-def $sa0, implicit-def $usr
J2_jump %bb.3, implicit-def dead $pc
bb.2.for.cond.cleanup:
PS_jmpret $r31, implicit-def dead $pc
bb.3.for.body:
successors: %bb.2, %bb.3
%1:intregs = PHI %7, %bb.1, %6, %bb.3
%3:intregs = PHI %11, %bb.1, %4, %bb.3
%12:intregs = L2_loadri_io %1, 40 :: (load (s32) from %ir.cgep, !tbaa !5)
L4_add_memopw_io %1, 0, killed %12 :: (store (s32) into %ir.lsr.iv15, !tbaa !5), (load (s32) from %ir.lsr.iv15, !tbaa !5)
L4_add_memopw_io %1, 8, %3 :: (store (s32) into %ir.cgep18, !tbaa !5), (load (s32) from %ir.cgep18, !tbaa !5)
%4:intregs = nuw nsw A2_addi %3, 1
%6:intregs = A2_addi %1, 4
ENDLOOP0 %bb.3, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
J2_jump %bb.2, implicit-def $pc
...
|
