Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/CodeGen/SystemZ/Large/branch-range-08.py

@@ -0,0 +1,69 @@
+# Test 64-bit BRANCH RELATIVE ON COUNT in cases where some branches are out
+# of range.
+# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
+
+# Construct:
+#
+# loopN:
+#   load of countN
+#   ...
+# loop0:
+#   0xffd8 bytes, from MVIY instructions
+#   conditional branch to main
+# after0:
+#   ...
+#   decrement of countN
+#   conditional branch to loopN
+# afterN:
+#
+# Each load occupies 6 bytes.  Each decrement and branch occupies 4
+# bytes if BRCTG can be used, otherwise it occupies 10 bytes (AGHI + BRCL).
+# This means that loop 5 contains 4 * 6 + 0xffd8 + 4 * 4 == 0x10000 bytes
+# and is therefore (just) in range.  Loop 6 is out of range.
+#
+# CHECK: brctg {{%r[0-9]+}}
+# CHECK: brctg {{%r[0-9]+}}
+# CHECK: brctg {{%r[0-9]+}}
+# CHECK: brctg {{%r[0-9]+}}
+# CHECK: brctg {{%r[0-9]+}}
+# CHECK: aghi {{%r[0-9]+}}, -1
+# CHECK: jglh
+# CHECK: aghi {{%r[0-9]+}}, -1
+# CHECK: jglh
+# CHECK: aghi {{%r[0-9]+}}, -1
+# CHECK: jglh
+
+branch_blocks = 8
+main_size = 0xffd8
+
+print 'define void @f1(i8 *%base, i64 *%counts) {'
+print 'entry:'
+
+for i in xrange(branch_blocks - 1, -1, -1):
+    print '  %%countptr%d = getelementptr i64, i64 *%%counts, i64 %d' % (i, i)
+    print '  %%initcount%d = load i64 , i64 *%%countptr%d' % (i, i)
+    print '  br label %%loop%d' % i
+    
+    print 'loop%d:' % i
+    block1 = 'entry' if i == branch_blocks - 1 else 'loop%d' % (i + 1)
+    block2 = 'loop0' if i == 0 else 'after%d' % (i - 1)
+    print ('  %%count%d = phi i64 [ %%initcount%d, %%%s ],'
+           ' [ %%nextcount%d, %%%s ]' % (i, i, block1, i, block2))
+
+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, i8 *%%base, i64 %d' % (i, offset)
+    print '  store volatile i8 %d, i8 *%%ptr%d' % (value, i)
+
+for i in xrange(branch_blocks):
+    print '  %%nextcount%d = add i64 %%count%d, -1' % (i, i)
+    print '  %%test%d = icmp ne i64 %%nextcount%d, 0' % (i, i)
+    print '  br i1 %%test%d, label %%loop%d, label %%after%d' % (i, i, i)
+    print ''
+    print 'after%d:' % i
+
+print '  ret void'
+print '}'