1# Test 64-bit COMPARE LOGICAL IMMEDIATE AND BRANCH in cases where the sheer
2# number of instructions causes some branches to be out of range.
3# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
4
5# Construct:
6#
7# before0:
8#   conditional branch to after0
9#   ...
10# beforeN:
11#   conditional branch to after0
12# main:
13#   0xffb4 bytes, from MVIY instructions
14#   conditional branch to main
15# after0:
16#   ...
17#   conditional branch to main
18# afterN:
19#
20# Each conditional branch sequence occupies 18 bytes if it uses a short
21# branch and 24 if it uses a long one.  The ones before "main:" have to
22# take the branch length into account, which is 6 for short branches,
23# so the final (0x4c - 6) / 18 == 3 blocks can use short branches.
24# The ones after "main:" do not, so the first 0x4c / 18 == 4 blocks
25# can use short branches.  The conservative algorithm we use makes
26# one of the forward branches unnecessarily long, as noted in the
27# check output below.
28#
29# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
30# CHECK: sg [[REG]], 0(%r4)
31# CHECK: clgfi [[REG]], 50
32# CHECK: jgl [[LABEL:\.L[^ ]*]]
33# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
34# CHECK: sg [[REG]], 0(%r4)
35# CHECK: clgfi [[REG]], 51
36# CHECK: jgl [[LABEL]]
37# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
38# CHECK: sg [[REG]], 0(%r4)
39# CHECK: clgfi [[REG]], 52
40# CHECK: jgl [[LABEL]]
41# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
42# CHECK: sg [[REG]], 0(%r4)
43# CHECK: clgfi [[REG]], 53
44# CHECK: jgl [[LABEL]]
45# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
46# CHECK: sg [[REG]], 0(%r4)
47# CHECK: clgfi [[REG]], 54
48# CHECK: jgl [[LABEL]]
49# ...as mentioned above, the next one could be a CLGIJL instead...
50# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
51# CHECK: sg [[REG]], 0(%r4)
52# CHECK: clgfi [[REG]], 55
53# CHECK: jgl [[LABEL]]
54# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
55# CHECK: sg [[REG]], 0(%r4)
56# CHECK: clgijl [[REG]], 56, [[LABEL]]
57# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
58# CHECK: sg [[REG]], 0(%r4)
59# CHECK: clgijl [[REG]], 57, [[LABEL]]
60# ...main goes here...
61# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
62# CHECK: sg [[REG]], 0(%r4)
63# CHECK: clgijl [[REG]], 100, [[LABEL:\.L[^ ]*]]
64# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
65# CHECK: sg [[REG]], 0(%r4)
66# CHECK: clgijl [[REG]], 101, [[LABEL]]
67# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
68# CHECK: sg [[REG]], 0(%r4)
69# CHECK: clgijl [[REG]], 102, [[LABEL]]
70# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
71# CHECK: sg [[REG]], 0(%r4)
72# CHECK: clgijl [[REG]], 103, [[LABEL]]
73# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
74# CHECK: sg [[REG]], 0(%r4)
75# CHECK: clgfi [[REG]], 104
76# CHECK: jgl [[LABEL]]
77# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
78# CHECK: sg [[REG]], 0(%r4)
79# CHECK: clgfi [[REG]], 105
80# CHECK: jgl [[LABEL]]
81# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
82# CHECK: sg [[REG]], 0(%r4)
83# CHECK: clgfi [[REG]], 106
84# CHECK: jgl [[LABEL]]
85# CHECK: lg [[REG:%r[0-5]]], 0(%r3)
86# CHECK: sg [[REG]], 0(%r4)
87# CHECK: clgfi [[REG]], 107
88# CHECK: jgl [[LABEL]]
89
90from __future__ import print_function
91
92branch_blocks = 8
93main_size = 0xffb4
94
95print('@global = global i32 0')
96
97print('define void @f1(i8 *%base, i64 *%stopa, i64 *%stopb) {')
98print('entry:')
99print('  br label %before0')
100print('')
101
102for i in range(branch_blocks):
103    next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main'
104    print('before%d:' % i)
105    print('  %%bcur%da = load i64 , i64 *%%stopa' % i)
106    print('  %%bcur%db = load i64 , i64 *%%stopb' % i)
107    print('  %%bsub%d = sub i64 %%bcur%da, %%bcur%db' % (i, i, i))
108    print('  %%btest%d = icmp ult i64 %%bsub%d, %d' % (i, i, i + 50))
109    print('  br i1 %%btest%d, label %%after0, label %%%s' % (i, next))
110    print('')
111
112print('%s:' % next)
113a, b = 1, 1
114for i in range(0, main_size, 6):
115    a, b = b, a + b
116    offset = 4096 + b % 500000
117    value = a % 256
118    print('  %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset))
119    print('  store volatile i8 %d, i8 *%%ptr%d' % (value, i))
120
121for i in range(branch_blocks):
122    print('  %%acur%da = load i64 , i64 *%%stopa' % i)
123    print('  %%acur%db = load i64 , i64 *%%stopb' % i)
124    print('  %%asub%d = sub i64 %%acur%da, %%acur%db' % (i, i, i))
125    print('  %%atest%d = icmp ult i64 %%asub%d, %d' % (i, i, i + 100))
126    print('  br i1 %%atest%d, label %%main, label %%after%d' % (i, i))
127    print('')
128    print('after%d:' % i)
129
130print('  %dummy = load volatile i32, i32 *@global')
131print('  ret void')
132print('}')
133