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
|
# 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 dependencies are added correctly.
# The original code is as follows.
#
# ```
# void f(int *a, int n) {
# for (int i = 1; i < n; i++) {
# a[i] += a[i];
# a[i-1] += i;
# }
# }
# ```
#
# Loop-carried dependencies exist from load/store for a[i] to store for a[i-1], but not vice versa.
# CHECK: ===== Loop Carried Edges Begin =====
# CHECK-NEXT: Loop carried edges from SU(3)
# CHECK-NEXT: Order
# CHECK-NEXT: SU(7)
# CHECK-NEXT: Loop carried edges from SU(5)
# CHECK-NEXT: Order
# CHECK-NEXT: SU(7)
# CHECK-NEXT: ===== Loop Carried Edges End =====
--- |
define dso_local void @f(ptr nocapture noundef %a, i32 noundef %n) local_unnamed_addr {
entry:
%cmp11 = icmp sgt i32 %n, 1
br i1 %cmp11, label %for.body.preheader, label %for.cond.cleanup
for.body.preheader:
%load_initial = load i32, ptr %a, align 4
%cgep = getelementptr i8, ptr %a, i32 4
br label %for.body
for.cond.cleanup:
ret void
for.body:
%lsr.iv = phi ptr [ %cgep, %for.body.preheader ], [ %cgep16, %for.body ]
%store_forwarded = phi i32 [ %load_initial, %for.body.preheader ], [ %add, %for.body ]
%i.012 = phi i32 [ 1, %for.body.preheader ], [ %inc, %for.body ]
%0 = load i32, ptr %lsr.iv, align 4, !tbaa !5
%add = shl nsw i32 %0, 1
store i32 %add, ptr %lsr.iv, align 4, !tbaa !5
%1 = add i32 %store_forwarded, %i.012
%cgep15 = getelementptr i8, ptr %lsr.iv, i32 -4
store i32 %1, ptr %cgep15, align 4, !tbaa !5
%inc = add nuw nsw i32 %i.012, 1
%exitcond.not = icmp eq i32 %n, %inc
%cgep16 = getelementptr i8, ptr %lsr.iv, 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
%9:intregs = COPY $r1
%8:intregs = COPY $r0
%10:predregs = C2_cmpgti %9, 1
J2_jumpf %10, %bb.2, implicit-def dead $pc
J2_jump %bb.1, implicit-def dead $pc
bb.1.for.body.preheader:
%0:intregs, %1:intregs = L2_loadri_pi %8, 4 :: (load (s32) from %ir.a)
%12:intregs = A2_tfrsi 1
%16:intregs = A2_addi %9, -1
%17:intregs = COPY %16
J2_loop0r %bb.3, %17, 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 (machine-block-address-taken):
successors: %bb.2(0x04000000), %bb.3(0x7c000000)
%2:intregs = PHI %1, %bb.1, %7, %bb.3
%3:intregs = PHI %0, %bb.1, %5, %bb.3
%4:intregs = PHI %12, %bb.1, %6, %bb.3
%13:intregs = L2_loadri_io %2, 0 :: (load (s32) from %ir.lsr.iv, !tbaa !5)
%5:intregs = nsw S2_asl_i_r killed %13, 1
S2_storeri_io %2, 0, %5 :: (store (s32) into %ir.lsr.iv, !tbaa !5)
%14:intregs = A2_add %3, %4
S2_storeri_io %2, -4, killed %14 :: (store (s32) into %ir.cgep15, !tbaa !5)
%6:intregs = nuw nsw A2_addi %4, 1
%7:intregs = A2_addi %2, 4
ENDLOOP0 %bb.3, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
J2_jump %bb.2, implicit-def $pc
...
|
