1# Test 32-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 4 bytes.  Each decrement and branch occupies 4
20# bytes if BRCT can be used, otherwise it occupies 10 bytes (AHI + BRCL).
21# This means that loop 6 contains 5 * 4 + 0xffd8 + 5 * 4 == 0x10000 bytes
22# and is therefore (just) in range.  Loop 7 is out of range.
23#
24# CHECK: brct {{%r[0-9]+}}
25# CHECK: brct {{%r[0-9]+}}
26# CHECK: brct {{%r[0-9]+}}
27# CHECK: brct {{%r[0-9]+}}
28# CHECK: brct {{%r[0-9]+}}
29# CHECK: brct {{%r[0-9]+}}
30# CHECK: ahi {{%r[0-9]+}}, -1
31# CHECK: jglh
32# CHECK: ahi {{%r[0-9]+}}, -1
33# CHECK: jglh
34
35branch_blocks = 8
36main_size = 0xffd8
37
38print 'define void @f1(i8 *%base, i32 *%counts) {'
39print 'entry:'
40
41for i in xrange(branch_blocks - 1, -1, -1):
42    print '  %%countptr%d = getelementptr i32, i32 *%%counts, i64 %d' % (i, i)
43    print '  %%initcount%d = load i32 , i32 *%%countptr%d' % (i, i)
44    print '  br label %%loop%d' % i
45
46    print 'loop%d:' % i
47    block1 = 'entry' if i == branch_blocks - 1 else 'loop%d' % (i + 1)
48    block2 = 'loop0' if i == 0 else 'after%d' % (i - 1)
49    print ('  %%count%d = phi i32 [ %%initcount%d, %%%s ],'
50           ' [ %%nextcount%d, %%%s ]' % (i, i, block1, i, block2))
51
52a, b = 1, 1
53for i in xrange(0, main_size, 6):
54    a, b = b, a + b
55    offset = 4096 + b % 500000
56    value = a % 256
57    print '  %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset)
58    print '  store volatile i8 %d, i8 *%%ptr%d' % (value, i)
59
60for i in xrange(branch_blocks):
61    print '  %%nextcount%d = add i32 %%count%d, -1' % (i, i)
62    print '  %%test%d = icmp ne i32 %%nextcount%d, 0' % (i, i)
63    print '  br i1 %%test%d, label %%loop%d, label %%after%d' % (i, i, i)
64    print ''
65    print 'after%d:' % i
66
67print '  ret void'
68print '}'
69