diff options
Diffstat (limited to 'test/CodeGen/SystemZ/Large/branch-range-01.py')
| -rw-r--r-- | test/CodeGen/SystemZ/Large/branch-range-01.py | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/Large/branch-range-01.py b/test/CodeGen/SystemZ/Large/branch-range-01.py new file mode 100644 index 0000000000000..552c9ca0ea851 --- /dev/null +++ b/test/CodeGen/SystemZ/Large/branch-range-01.py @@ -0,0 +1,105 @@ +# 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 volatile 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 volatile 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 '}' |