mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
110 lines
3.4 KiB
Python
110 lines
3.4 KiB
Python
|
# Test 32-bit COMPARE IMMEDIATE AND BRANCH in cases where the sheer number of
|
||
|
|
# instructions causes some branches to be out of range.
|
||
|
|
# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
|
||
|
|
|
||
|
|
# Construct:
|
||
|
|
#
|
||
|
|
# before0:
|
||
|
|
# conditional branch to after0
|
||
|
|
# ...
|
||
|
|
# beforeN:
|
||
|
|
# conditional branch to after0
|
||
|
|
# main:
|
||
|
|
# 0xffcc bytes, from MVIY instructions
|
||
|
|
# conditional branch to main
|
||
|
|
# after0:
|
||
|
|
# ...
|
||
|
|
# conditional branch to main
|
||
|
|
# afterN:
|
||
|
|
#
|
||
|
|
# Each conditional branch sequence occupies 12 bytes if it uses a short
|
||
|
|
# branch and 16 if it uses a long one. The ones before "main:" have to
|
||
|
|
# take the branch length into account, which is 6 for short branches,
|
||
|
|
# so the final (0x34 - 6) / 12 == 3 blocks can use short branches.
|
||
|
|
# The ones after "main:" do not, so the first 0x34 / 12 == 4 blocks
|
||
|
|
# can use short branches. The conservative algorithm we use makes
|
||
|
|
# one of the forward branches unnecessarily long, as noted in the
|
||
|
|
# check output below.
|
||
|
|
#
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 50
|
||
|
|
# CHECK: jgl [[LABEL:\.L[^ ]*]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 51
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 52
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 53
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 54
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# ...as mentioned above, the next one could be a CIJL instead...
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 55
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cijl [[REG]], 56, [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cijl [[REG]], 57, [[LABEL]]
|
||
|
|
# ...main goes here...
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cijl [[REG]], 100, [[LABEL:\.L[^ ]*]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cijl [[REG]], 101, [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cijl [[REG]], 102, [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cijl [[REG]], 103, [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 104
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 105
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 106
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: chi [[REG]], 107
|
||
|
|
# CHECK: jgl [[LABEL]]
|
||
|
|
|
||
|
|
branch_blocks = 8
|
||
|
|
main_size = 0xffcc
|
||
|
|
|
||
|
|
print 'define void @f1(i8 *%base, i8 *%stop) {'
|
||
|
|
print 'entry:'
|
||
|
|
print ' br label %before0'
|
||
|
|
print ''
|
||
|
|
|
||
|
|
for i in xrange(branch_blocks):
|
||
|
|
next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main'
|
||
|
|
print 'before%d:' % i
|
||
|
|
print ' %%bcur%d = load volatile i8 *%%stop' % i
|
||
|
|
print ' %%bext%d = sext i8 %%bcur%d to i32' % (i, i)
|
||
|
|
print ' %%btest%d = icmp slt i32 %%bext%d, %d' % (i, i, i + 50)
|
||
|
|
print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next)
|
||
|
|
print ''
|
||
|
|
|
||
|
|
print '%s:' % next
|
||
|
|
a, b = 1, 1
|
||
|
|
for i in xrange(0, main_size, 6):
|
||
|
|
a, b = b, a + b
|
||
|
|
offset = 4096 + b % 500000
|
||
|
|
value = a % 256
|
||
|
|
print ' %%ptr%d = getelementptr i8 *%%base, i64 %d' % (i, offset)
|
||
|
|
print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i)
|
||
|
|
|
||
|
|
for i in xrange(branch_blocks):
|
||
|
|
print ' %%acur%d = load volatile i8 *%%stop' % i
|
||
|
|
print ' %%aext%d = sext i8 %%acur%d to i32' % (i, i)
|
||
|
|
print ' %%atest%d = icmp slt i32 %%aext%d, %d' % (i, i, i + 100)
|
||
|
|
print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i)
|
||
|
|
print ''
|
||
|
|
print 'after%d:' % i
|
||
|
|
|
||
|
|
print ' ret void'
|
||
|
|
print '}'
|