1# Test 64-bit BRANCH RELATIVE ON COUNT in cases where some branches are out
2# of range.
3# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
4
5# Construct:
6#
7# loopN:
8#   load of countN
9#   ...
10# loop0:
11#   0xffd8 bytes, from MVIY instructions
12#   conditional branch to main
13# after0:
14#   ...
15#   decrement of countN
16#   conditional branch to loopN
17# afterN:
18#
19# Each load occupies 6 bytes.  Each decrement and branch occupies 4
20# bytes if BRCTG can be used, otherwise it occupies 10 bytes (AGHI + BRCL).
21# This means that loop 5 contains 4 * 6 + 0xffd8 + 4 * 4 == 0x10000 bytes
22# and is therefore (just) in range.  Loop 6 is out of range.
23#
24# CHECK: brctg {{%r[0-9]+}}
25# CHECK: brctg {{%r[0-9]+}}
26# CHECK: brctg {{%r[0-9]+}}
27# CHECK: brctg {{%r[0-9]+}}
28# CHECK: brctg {{%r[0-9]+}}
29# CHECK: aghi {{%r[0-9]+}}, -1
30# CHECK: jglh
31# CHECK: aghi {{%r[0-9]+}}, -1
32# CHECK: jglh
33# CHECK: aghi {{%r[0-9]+}}, -1
34# CHECK: jglh
35
36branch_blocks = 8
37main_size = 0xffd8
38
39print 'define void @f1(i8 *%base, i64 *%counts) {'
40print 'entry:'
41
42for i in xrange(branch_blocks - 1, -1, -1):
43    print '  %%countptr%d = getelementptr i64 *%%counts, i64 %d' % (i, i)
44    print '  %%initcount%d = load i64 *%%countptr%d' % (i, i)
45    print '  br label %%loop%d' % i
46
47    print 'loop%d:' % i
48    block1 = 'entry' if i == branch_blocks - 1 else 'loop%d' % (i + 1)
49    block2 = 'loop0' if i == 0 else 'after%d' % (i - 1)
50    print ('  %%count%d = phi i64 [ %%initcount%d, %%%s ],'
51           ' [ %%nextcount%d, %%%s ]' % (i, i, block1, i, block2))
52
53a, b = 1, 1
54for i in xrange(0, main_size, 6):
55    a, b = b, a + b
56    offset = 4096 + b % 500000
57    value = a % 256
58    print '  %%ptr%d = getelementptr i8 *%%base, i64 %d' % (i, offset)
59    print '  store volatile i8 %d, i8 *%%ptr%d' % (value, i)
60
61for i in xrange(branch_blocks):
62    print '  %%nextcount%d = add i64 %%count%d, -1' % (i, i)
63    print '  %%test%d = icmp ne i64 %%nextcount%d, 0' % (i, i)
64    print '  br i1 %%test%d, label %%loop%d, label %%after%d' % (i, i, i)
65    print ''
66    print 'after%d:' % i
67
68print '  ret void'
69print '}'
70