1
# Test normal conditional branches in cases where the sheer number of
2
# instructions causes some branches to be out of range.
3
# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
8
# conditional branch to after0
11
# conditional branch to after0
13
# 0xffd8 bytes, from MVIY instructions
14
# conditional branch to main
17
# conditional branch to main
20
# Each conditional branch sequence occupies 8 bytes if it uses a short branch
21
# and 10 if it uses a long one. The ones before "main:" have to take the branch
22
# length into account -- which is 4 bytes for short branches -- so the final
23
# (0x28 - 4) / 8 == 4 blocks can use short branches. The ones after "main:"
24
# do not, so the first 0x28 / 8 == 5 can use short branches. However,
25
# the conservative algorithm we use makes one branch unnecessarily long
28
# CHECK: c %r4, 0(%r3)
29
# CHECK: jge [[LABEL:\.L[^ ]*]]
30
# CHECK: c %r4, 4(%r3)
31
# CHECK: jge [[LABEL]]
32
# CHECK: c %r4, 8(%r3)
33
# CHECK: jge [[LABEL]]
34
# CHECK: c %r4, 12(%r3)
35
# CHECK: jge [[LABEL]]
36
# CHECK: c %r4, 16(%r3)
37
# CHECK: jge [[LABEL]]
38
# CHECK: c %r4, 20(%r3)
39
# CHECK: jge [[LABEL]]
40
# CHECK: c %r4, 24(%r3)
41
# CHECK: j{{g?}}e [[LABEL]]
42
# CHECK: c %r4, 28(%r3)
44
# CHECK: c %r4, 32(%r3)
46
# CHECK: c %r4, 36(%r3)
48
# ...main goes here...
49
# CHECK: c %r4, 100(%r3)
50
# CHECK: je [[LABEL:\.L[^ ]*]]
51
# CHECK: c %r4, 104(%r3)
53
# CHECK: c %r4, 108(%r3)
55
# CHECK: c %r4, 112(%r3)
57
# CHECK: c %r4, 116(%r3)
58
# CHECK: j{{g?}}e [[LABEL]]
59
# CHECK: c %r4, 120(%r3)
60
# CHECK: jge [[LABEL]]
61
# CHECK: c %r4, 124(%r3)
62
# CHECK: jge [[LABEL]]
63
# CHECK: c %r4, 128(%r3)
64
# CHECK: jge [[LABEL]]
65
# CHECK: c %r4, 132(%r3)
66
# CHECK: jge [[LABEL]]
67
# CHECK: c %r4, 136(%r3)
68
# CHECK: jge [[LABEL]]
73
print 'define void @f1(i8 *%base, i32 *%stop, i32 %limit) {'
75
print ' br label %before0'
78
for i in xrange(branch_blocks):
79
next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main'
81
print ' %%bstop%d = getelementptr i32 *%%stop, i64 %d' % (i, i)
82
print ' %%bcur%d = load volatile i32 *%%bstop%d' % (i, i)
83
print ' %%btest%d = icmp eq i32 %%limit, %%bcur%d' % (i, i)
84
print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next)
89
for i in xrange(0, main_size, 6):
91
offset = 4096 + b % 500000
93
print ' %%ptr%d = getelementptr i8 *%%base, i64 %d' % (i, offset)
94
print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i)
96
for i in xrange(branch_blocks):
97
print ' %%astop%d = getelementptr i32 *%%stop, i64 %d' % (i, i + 25)
98
print ' %%acur%d = load volatile i32 *%%astop%d' % (i, i)
99
print ' %%atest%d = icmp eq i32 %%limit, %%acur%d' % (i, i)
100
print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i)