1# Test 32-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# 0xffc6 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 14 bytes if it uses a short 21# branch and 20 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 (0x3a - 6) / 14 == 3 blocks can use short branches. 24# The ones after "main:" do not, so the first 0x3a / 14 == 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: l [[REG:%r[0-5]]], 0(%r3) 30# CHECK: s [[REG]], 0(%r4) 31# CHECK: clfi [[REG]], 50 32# CHECK: jgl [[LABEL:\.L[^ ]*]] 33# CHECK: l [[REG:%r[0-5]]], 0(%r3) 34# CHECK: s [[REG]], 0(%r4) 35# CHECK: clfi [[REG]], 51 36# CHECK: jgl [[LABEL]] 37# CHECK: l [[REG:%r[0-5]]], 0(%r3) 38# CHECK: s [[REG]], 0(%r4) 39# CHECK: clfi [[REG]], 52 40# CHECK: jgl [[LABEL]] 41# CHECK: l [[REG:%r[0-5]]], 0(%r3) 42# CHECK: s [[REG]], 0(%r4) 43# CHECK: clfi [[REG]], 53 44# CHECK: jgl [[LABEL]] 45# CHECK: l [[REG:%r[0-5]]], 0(%r3) 46# CHECK: s [[REG]], 0(%r4) 47# CHECK: clfi [[REG]], 54 48# CHECK: jgl [[LABEL]] 49# ...as mentioned above, the next one could be a CLIJL instead... 50# CHECK: l [[REG:%r[0-5]]], 0(%r3) 51# CHECK: s [[REG]], 0(%r4) 52# CHECK: clfi [[REG]], 55 53# CHECK: jgl [[LABEL]] 54# CHECK: l [[REG:%r[0-5]]], 0(%r3) 55# CHECK: s [[REG]], 0(%r4) 56# CHECK: clijl [[REG]], 56, [[LABEL]] 57# CHECK: l [[REG:%r[0-5]]], 0(%r3) 58# CHECK: s [[REG]], 0(%r4) 59# CHECK: clijl [[REG]], 57, [[LABEL]] 60# ...main goes here... 61# CHECK: l [[REG:%r[0-5]]], 0(%r3) 62# CHECK: s [[REG]], 0(%r4) 63# CHECK: clijl [[REG]], 100, [[LABEL:\.L[^ ]*]] 64# CHECK: l [[REG:%r[0-5]]], 0(%r3) 65# CHECK: s [[REG]], 0(%r4) 66# CHECK: clijl [[REG]], 101, [[LABEL]] 67# CHECK: l [[REG:%r[0-5]]], 0(%r3) 68# CHECK: s [[REG]], 0(%r4) 69# CHECK: clijl [[REG]], 102, [[LABEL]] 70# CHECK: l [[REG:%r[0-5]]], 0(%r3) 71# CHECK: s [[REG]], 0(%r4) 72# CHECK: clijl [[REG]], 103, [[LABEL]] 73# CHECK: l [[REG:%r[0-5]]], 0(%r3) 74# CHECK: s [[REG]], 0(%r4) 75# CHECK: clfi [[REG]], 104 76# CHECK: jgl [[LABEL]] 77# CHECK: l [[REG:%r[0-5]]], 0(%r3) 78# CHECK: s [[REG]], 0(%r4) 79# CHECK: clfi [[REG]], 105 80# CHECK: jgl [[LABEL]] 81# CHECK: l [[REG:%r[0-5]]], 0(%r3) 82# CHECK: s [[REG]], 0(%r4) 83# CHECK: clfi [[REG]], 106 84# CHECK: jgl [[LABEL]] 85# CHECK: l [[REG:%r[0-5]]], 0(%r3) 86# CHECK: s [[REG]], 0(%r4) 87# CHECK: clfi [[REG]], 107 88# CHECK: jgl [[LABEL]] 89 90branch_blocks = 8 91main_size = 0xffc6 92 93print '@global = global i32 0' 94 95print 'define void @f1(i8 *%base, i32 *%stopa, i32 *%stopb) {' 96print 'entry:' 97print ' br label %before0' 98print '' 99 100for i in xrange(branch_blocks): 101 next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main' 102 print 'before%d:' % i 103 print ' %%bcur%da = load i32 , i32 *%%stopa' % i 104 print ' %%bcur%db = load i32 , i32 *%%stopb' % i 105 print ' %%bsub%d = sub i32 %%bcur%da, %%bcur%db' % (i, i, i) 106 print ' %%btest%d = icmp ult i32 %%bsub%d, %d' % (i, i, i + 50) 107 print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next) 108 print '' 109 110print '%s:' % next 111a, b = 1, 1 112for i in xrange(0, main_size, 6): 113 a, b = b, a + b 114 offset = 4096 + b % 500000 115 value = a % 256 116 print ' %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset) 117 print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i) 118 119for i in xrange(branch_blocks): 120 print ' %%acur%da = load i32 , i32 *%%stopa' % i 121 print ' %%acur%db = load i32 , i32 *%%stopb' % i 122 print ' %%asub%d = sub i32 %%acur%da, %%acur%db' % (i, i, i) 123 print ' %%atest%d = icmp ult i32 %%asub%d, %d' % (i, i, i + 100) 124 print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i) 125 print '' 126 print 'after%d:' % i 127 128print ' %dummy = load volatile i32, i32 *@global' 129print ' ret void' 130print '}' 131