llvm-6502/test/CodeGen/SystemZ/Large/branch-range-01.py
Richard Sandiford 086791eca2 Add TargetLowering::prepareVolatileOrAtomicLoad
One unusual feature of the z architecture is that the result of a
previous load can be reused indefinitely for subsequent loads, even if
a cache-coherent store to that location is performed by another CPU.
A special serializing instruction must be used if you want to force
a load to be reattempted.

Since volatile loads are not supposed to be omitted in this way,
we should insert a serializing instruction before each such load.
The same goes for atomic loads.

The patch implements this at the IR->DAG boundary, in a similar way
to atomic fences.  It is a no-op for targets other than SystemZ.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196905 91177308-0d34-0410-b5e6-96231b3b80d8
2013-12-10 10:36:34 +00:00

106 lines
3.0 KiB
Python

# Test normal conditional branches 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:
# 0xffd8 bytes, from MVIY instructions
# conditional branch to main
# after0:
# ...
# conditional branch to main
# afterN:
#
# Each conditional branch sequence occupies 8 bytes if it uses a short branch
# and 10 if it uses a long one. The ones before "main:" have to take the branch
# length into account -- which is 4 bytes for short branches -- so the final
# (0x28 - 4) / 8 == 4 blocks can use short branches. The ones after "main:"
# do not, so the first 0x28 / 8 == 5 can use short branches. However,
# the conservative algorithm we use makes one branch unnecessarily long
# on each side.
#
# CHECK: c %r4, 0(%r3)
# CHECK: jge [[LABEL:\.L[^ ]*]]
# CHECK: c %r4, 4(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 8(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 12(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 16(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 20(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 24(%r3)
# CHECK: j{{g?}}e [[LABEL]]
# CHECK: c %r4, 28(%r3)
# CHECK: je [[LABEL]]
# CHECK: c %r4, 32(%r3)
# CHECK: je [[LABEL]]
# CHECK: c %r4, 36(%r3)
# CHECK: je [[LABEL]]
# ...main goes here...
# CHECK: c %r4, 100(%r3)
# CHECK: je [[LABEL:\.L[^ ]*]]
# CHECK: c %r4, 104(%r3)
# CHECK: je [[LABEL]]
# CHECK: c %r4, 108(%r3)
# CHECK: je [[LABEL]]
# CHECK: c %r4, 112(%r3)
# CHECK: je [[LABEL]]
# CHECK: c %r4, 116(%r3)
# CHECK: j{{g?}}e [[LABEL]]
# CHECK: c %r4, 120(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 124(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 128(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 132(%r3)
# CHECK: jge [[LABEL]]
# CHECK: c %r4, 136(%r3)
# CHECK: jge [[LABEL]]
branch_blocks = 10
main_size = 0xffd8
print 'define void @f1(i8 *%base, i32 *%stop, i32 %limit) {'
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 ' %%bstop%d = getelementptr i32 *%%stop, i64 %d' % (i, i)
print ' %%bcur%d = load i32 *%%bstop%d' % (i, i)
print ' %%btest%d = icmp eq i32 %%limit, %%bcur%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 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 ' %%astop%d = getelementptr i32 *%%stop, i64 %d' % (i, i + 25)
print ' %%acur%d = load i32 *%%astop%d' % (i, i)
print ' %%atest%d = icmp eq i32 %%limit, %%acur%d' % (i, i)
print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i)
print ''
print 'after%d:' % i
print ' ret void'
print '}'