1e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# Test 64-bit COMPARE LOGICAL AND BRANCH in cases where the sheer number of 2e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# instructions causes some branches to be out of range. 3e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s 4e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 5e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# Construct: 6e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# 7e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# before0: 8e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# conditional branch to after0 9e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# ... 10e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# beforeN: 11e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# conditional branch to after0 12e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# main: 13e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# 0xffcc bytes, from MVIY instructions 14e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# conditional branch to main 15e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# after0: 16e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# ... 17e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# conditional branch to main 18e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# afterN: 19e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# 20e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# Each conditional branch sequence occupies 12 bytes if it uses a short 21e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# branch and 16 if it uses a long one. The ones before "main:" have to 22e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# take the branch length into account, which is 6 for short branches, 23e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# so the final (0x34 - 6) / 12 == 3 blocks can use short branches. 24e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# The ones after "main:" do not, so the first 0x34 / 12 == 4 blocks 25e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# can use short branches. The conservative algorithm we use makes 26e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# one of the forward branches unnecessarily long, as noted in the 27e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# check output below. 28e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# 29e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 0(%r3) 30e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 31e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL:\.L[^ ]*]] 32e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 1(%r3) 33e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 34e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 35e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 2(%r3) 36e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 37e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 38e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 3(%r3) 39e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 40e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 41e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 4(%r3) 42e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 43e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 44e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# ...as mentioned above, the next one could be a CLGRJL instead... 45e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 5(%r3) 46e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 47e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 48e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 6(%r3) 49e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgrjl %r4, [[REG]], [[LABEL]] 50e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 7(%r3) 51e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgrjl %r4, [[REG]], [[LABEL]] 52e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# ...main goes here... 53e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 25(%r3) 54e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgrjl %r4, [[REG]], [[LABEL:\.L[^ ]*]] 55e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 26(%r3) 56e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgrjl %r4, [[REG]], [[LABEL]] 57e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 27(%r3) 58e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgrjl %r4, [[REG]], [[LABEL]] 59e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 28(%r3) 60e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgrjl %r4, [[REG]], [[LABEL]] 61e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 29(%r3) 62e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 63e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 64e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 30(%r3) 65e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 66e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 67e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 31(%r3) 68e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 69e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 70e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: lgb [[REG:%r[0-5]]], 32(%r3) 71e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: clgr %r4, [[REG]] 72e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford# CHECK: jgl [[LABEL]] 73e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 74e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordbranch_blocks = 8 75e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordmain_size = 0xffcc 76e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 77de2d8694e25a814696358e95141f4b1aa4d8847ePirama Arumuga Nainarprint '@global = global i32 0' 78de2d8694e25a814696358e95141f4b1aa4d8847ePirama Arumuga Nainar 79e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint 'define void @f1(i8 *%base, i8 *%stop, i64 %limit) {' 80e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint 'entry:' 81e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint ' br label %before0' 82e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint '' 83e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 84e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordfor i in xrange(branch_blocks): 85e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main' 86e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print 'before%d:' % i 874c5e43da7792f75567b693105cc53e3f1992ad98Pirama Arumuga Nainar print ' %%bstop%d = getelementptr i8, i8 *%%stop, i64 %d' % (i, i) 884c5e43da7792f75567b693105cc53e3f1992ad98Pirama Arumuga Nainar print ' %%bcur%d = load i8 , i8 *%%bstop%d' % (i, i) 89e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' %%bext%d = sext i8 %%bcur%d to i64' % (i, i) 90e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' %%btest%d = icmp ult i64 %%limit, %%bext%d' % (i, i) 91e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next) 92e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print '' 93e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 94e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint '%s:' % next 95e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiforda, b = 1, 1 96e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordfor i in xrange(0, main_size, 6): 97e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford a, b = b, a + b 98e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford offset = 4096 + b % 500000 99e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford value = a % 256 1004c5e43da7792f75567b693105cc53e3f1992ad98Pirama Arumuga Nainar print ' %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset) 101e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i) 102e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 103e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordfor i in xrange(branch_blocks): 1044c5e43da7792f75567b693105cc53e3f1992ad98Pirama Arumuga Nainar print ' %%astop%d = getelementptr i8, i8 *%%stop, i64 %d' % (i, i + 25) 1054c5e43da7792f75567b693105cc53e3f1992ad98Pirama Arumuga Nainar print ' %%acur%d = load i8 , i8 *%%astop%d' % (i, i) 106e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' %%aext%d = sext i8 %%acur%d to i64' % (i, i) 107e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' %%atest%d = icmp ult i64 %%limit, %%aext%d' % (i, i) 108e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i) 109e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print '' 110e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford print 'after%d:' % i 111e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandiford 112de2d8694e25a814696358e95141f4b1aa4d8847ePirama Arumuga Nainarprint ' %dummy = load volatile i32, i32 *@global' 113e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint ' ret void' 114e2d6f91d63a2e8cf77b07794cda7d9ef72504769Richard Sandifordprint '}' 115