113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
|
# Test 32-bit COMPARE 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 14 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.
|
||
|
|
#
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 0(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL:\.L[^ ]*]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 1(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 2(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 3(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 4(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 5(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 6(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 7(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL]]
|
||
|
|
# ...main goes here...
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 25(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL:\.L[^ ]*]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 26(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 27(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 28(%r3)
|
||
|
|
# CHECK: crje %r4, [[REG]], [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 29(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 30(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 31(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
# CHECK: lb [[REG:%r[0-5]]], 32(%r3)
|
||
|
|
# CHECK: cr %r4, [[REG]]
|
||
|
|
# CHECK: jge [[LABEL]]
|
||
|
|
|
||
|
|
from __future__ import print_function
|
||
|
|
|
||
|
|
branch_blocks = 8
|
||
|
|
main_size = 0xffcc
|
||
|
|
|
||
|
|
print('@global = global i32 0')
|
||
|
|
|
||
|
|
print('define void @f1(i8 *%base, i8 *%stop, i32 %limit) {')
|
||
|
|
print('entry:')
|
||
|
|
print(' br label %before0')
|
||
|
|
print('')
|
||
|
|
|
||
|
|
for i in range(branch_blocks):
|
||
|
|
next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main'
|
||
|
|
print('before%d:' % i)
|
||
|
|
print(' %%bstop%d = getelementptr i8, i8 *%%stop, i64 %d' % (i, i))
|
||
|
|
print(' %%bcur%d = load i8 , i8 *%%bstop%d' % (i, i))
|
||
|
|
print(' %%bext%d = sext i8 %%bcur%d to i32' % (i, i))
|
||
|
|
print(' %%btest%d = icmp eq i32 %%limit, %%bext%d' % (i, i))
|
||
|
|
print(' br i1 %%btest%d, label %%after0, label %%%s' % (i, next))
|
||
|
|
print('')
|
||
|
|
|
||
|
|
print('%s:' % next)
|
||
|
|
a, b = 1, 1
|
||
|
|
for i in range(0, main_size, 6):
|
||
|
|
a, b = b, a + b
|
||
|
|
offset = 4096 + b % 500000
|
||
|
|
value = a % 256
|
||
|
|
print(' %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset))
|
||
|
|
print(' store volatile i8 %d, i8 *%%ptr%d' % (value, i))
|
||
|
|
|
||
|
|
for i in range(branch_blocks):
|
||
|
|
print(' %%astop%d = getelementptr i8, i8 *%%stop, i64 %d' % (i, i + 25))
|
||
|
|
print(' %%acur%d = load i8 , i8 *%%astop%d' % (i, i))
|
||
|
|
print(' %%aext%d = sext i8 %%acur%d to i32' % (i, i))
|
||
|
|
print(' %%atest%d = icmp eq i32 %%limit, %%aext%d' % (i, i))
|
||
|
|
print(' br i1 %%atest%d, label %%main, label %%after%d' % (i, i))
|
||
|
|
print('')
|
||
|
|
print('after%d:' % i)
|
||
|
|
|
||
|
|
print(' %dummy = load volatile i32, i32 *@global')
|
||
|
|
print(' ret void')
|
||
|
|
print('}')
|