1 # Test 64-bit COMPARE AND BRANCH 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 # 0xffcc bytes, from MVIY instructions
14 # conditional branch to main
17 # conditional branch to main
20 # Each conditional branch sequence occupies 12 bytes if it uses a short
21 # branch and 16 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 (0x34 - 6) / 12 == 3 blocks can use short branches.
24 # The ones after "main:" do not, so the first 0x34 / 12 == 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
29 # CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
30 # CHECK: cgr %r4, [[REG]]
31 # CHECK: jge [[LABEL:\.L[^ ]*]]
32 # CHECK: lgb [[REG:%r[0-5]]], 1(%r3)
33 # CHECK: cgr %r4, [[REG]]
34 # CHECK: jge [[LABEL]]
35 # CHECK: lgb [[REG:%r[0-5]]], 2(%r3)
36 # CHECK: cgr %r4, [[REG]]
37 # CHECK: jge [[LABEL]]
38 # CHECK: lgb [[REG:%r[0-5]]], 3(%r3)
39 # CHECK: cgr %r4, [[REG]]
40 # CHECK: jge [[LABEL]]
41 # CHECK: lgb [[REG:%r[0-5]]], 4(%r3)
42 # CHECK: cgr %r4, [[REG]]
43 # CHECK: jge [[LABEL]]
44 # ...as mentioned above, the next one could be a CGRJE instead...
45 # CHECK: lgb [[REG:%r[0-5]]], 5(%r3)
46 # CHECK: cgr %r4, [[REG]]
47 # CHECK: jge [[LABEL]]
48 # CHECK: lgb [[REG:%r[0-5]]], 6(%r3)
49 # CHECK: cgrje %r4, [[REG]], [[LABEL]]
50 # CHECK: lgb [[REG:%r[0-5]]], 7(%r3)
51 # CHECK: cgrje %r4, [[REG]], [[LABEL]]
52 # ...main goes here...
53 # CHECK: lgb [[REG:%r[0-5]]], 25(%r3)
54 # CHECK: cgrje %r4, [[REG]], [[LABEL:\.L[^ ]*]]
55 # CHECK: lgb [[REG:%r[0-5]]], 26(%r3)
56 # CHECK: cgrje %r4, [[REG]], [[LABEL]]
57 # CHECK: lgb [[REG:%r[0-5]]], 27(%r3)
58 # CHECK: cgrje %r4, [[REG]], [[LABEL]]
59 # CHECK: lgb [[REG:%r[0-5]]], 28(%r3)
60 # CHECK: cgrje %r4, [[REG]], [[LABEL]]
61 # CHECK: lgb [[REG:%r[0-5]]], 29(%r3)
62 # CHECK: cgr %r4, [[REG]]
63 # CHECK: jge [[LABEL]]
64 # CHECK: lgb [[REG:%r[0-5]]], 30(%r3)
65 # CHECK: cgr %r4, [[REG]]
66 # CHECK: jge [[LABEL]]
67 # CHECK: lgb [[REG:%r[0-5]]], 31(%r3)
68 # CHECK: cgr %r4, [[REG]]
69 # CHECK: jge [[LABEL]]
70 # CHECK: lgb [[REG:%r[0-5]]], 32(%r3)
71 # CHECK: cgr %r4, [[REG]]
72 # CHECK: jge [[LABEL]]
77 print 'define void @f1(i8 *%base, i8 *%stop, i64 %limit) {'
79 print ' br label %before0'
82 for i in xrange(branch_blocks):
83 next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main'
85 print ' %%bstop%d = getelementptr i8 *%%stop, i64 %d' % (i, i)
86 print ' %%bcur%d = load volatile i8 *%%bstop%d' % (i, i)
87 print ' %%bext%d = sext i8 %%bcur%d to i64' % (i, i)
88 print ' %%btest%d = icmp eq i64 %%limit, %%bext%d' % (i, i)
89 print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next)
94 for i in xrange(0, main_size, 6):
96 offset = 4096 + b % 500000
98 print ' %%ptr%d = getelementptr i8 *%%base, i64 %d' % (i, offset)
99 print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i)
101 for i in xrange(branch_blocks):
102 print ' %%astop%d = getelementptr i8 *%%stop, i64 %d' % (i, i + 25)
103 print ' %%acur%d = load volatile i8 *%%astop%d' % (i, i)
104 print ' %%aext%d = sext i8 %%acur%d to i64' % (i, i)
105 print ' %%atest%d = icmp eq i64 %%limit, %%aext%d' % (i, i)
106 print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i)