[SystemZ] Add unsigned compare-and-branch instructions

[oota-llvm.git] / test / CodeGen / SystemZ / Large / branch-range-11.py

diff --git a/test/CodeGen/SystemZ/Large/branch-range-11.py b/test/CodeGen/SystemZ/Large/branch-range-11.py
new file mode 100644 (file)
index 0000000..034902c
--- /dev/null
+++ b/test/CodeGen/SystemZ/Large/branch-range-11.py
@@ -0,0 +1,127 @@
+# Test 32-bit COMPARE LOGICAL 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:
+#   0xffc6 bytes, from MVIY instructions
+#   conditional branch to main
+# after0:
+#   ...
+#   conditional branch to main
+# afterN:
+#
+# Each conditional branch sequence occupies 14 bytes if it uses a short
+# branch and 20 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 (0x3a - 6) / 14 == 3 blocks can use short branches.
+# The ones after "main:" do not, so the first 0x3a / 14 == 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: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 50
+# CHECK: jgl [[LABEL:\.L[^ ]*]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 51
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 52
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 53
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 54
+# CHECK: jgl [[LABEL]]
+# ...as mentioned above, the next one could be a CLIJL instead...
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 55
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clijl [[REG]], 56, [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clijl [[REG]], 57, [[LABEL]]
+# ...main goes here...
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clijl [[REG]], 100, [[LABEL:\.L[^ ]*]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clijl [[REG]], 101, [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clijl [[REG]], 102, [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clijl [[REG]], 103, [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 104
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 105
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 106
+# CHECK: jgl [[LABEL]]
+# CHECK: l [[REG:%r[0-5]]], 0(%r3)
+# CHECK: s [[REG]], 0(%r4)
+# CHECK: clfi [[REG]], 107
+# CHECK: jgl [[LABEL]]
+
+branch_blocks = 8
+main_size = 0xffc6
+
+print 'define void @f1(i8 *%base, i32 *%stopa, i32 *%stopb) {'
+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%da = load volatile i32 *%%stopa' % i
+    print '  %%bcur%db = load volatile i32 *%%stopb' % i
+    print '  %%bsub%d = sub i32 %%bcur%da, %%bcur%db' % (i, i, i)
+    print '  %%btest%d = icmp ult i32 %%bsub%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%da = load volatile i32 *%%stopa' % i
+    print '  %%acur%db = load volatile i32 *%%stopb' % i
+    print '  %%asub%d = sub i32 %%acur%da, %%acur%db' % (i, i, i)
+    print '  %%atest%d = icmp ult i32 %%asub%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 '}'