llvm/test/CodeGen/SystemZ/Large/branch-range-02.py

   1 # Test normal conditional branches in cases where block alignments cause
   2 # some branches to be out of range.
   3 # RUN: %python %s | llc -mtriple=s390x-linux-gnu -align-all-blocks=8 | FileCheck %s
   4
   5 # Construct:
   6 #
   7 # b0:
   8 #   conditional branch to end
   9 #   ...
  10 # b<N>:
  11 #   conditional branch to end
  12 # b<N+1>:
  13 #   conditional branch to b0
  14 #   ...
  15 # b<2*N>:
  16 #   conditional branch to b0
  17 # end:
  18 #
  19 # with N == 256 + 4.  The -align-all-blocks=8 option ensures that all blocks
  20 # are 256 bytes in size.  The first 4 blocks and the last 4 blocks are then
  21 # out of range.
  22 #
  23 # CHECK: c %r4, 0(%r3)
  24 # CHECK: jge [[LABEL:\.L[^ ]*]]
  25 # CHECK: c %r4, 4(%r3)
  26 # CHECK: jge [[LABEL]]
  27 # CHECK: c %r4, 8(%r3)
  28 # CHECK: jge [[LABEL]]
  29 # CHECK: c %r4, 12(%r3)
  30 # CHECK: jge [[LABEL]]
  31 # CHECK: c %r4, 16(%r3)
  32 # CHECK: je [[LABEL]]
  33 # CHECK: c %r4, 20(%r3)
  34 # CHECK: je [[LABEL]]
  35 # CHECK: c %r4, 24(%r3)
  36 # CHECK: je [[LABEL]]
  37 # CHECK: c %r4, 28(%r3)
  38 # CHECK: je [[LABEL]]
  39 # ...lots of other blocks...
  40 # CHECK: c %r4, 1004(%r3)
  41 # CHECK: je [[LABEL:\.L[^ ]*]]
  42 # CHECK: c %r4, 1008(%r3)
  43 # CHECK: je [[LABEL]]
  44 # CHECK: c %r4, 1012(%r3)
  45 # CHECK: je [[LABEL]]
  46 # CHECK: c %r4, 1016(%r3)
  47 # CHECK: je [[LABEL]]
  48 # CHECK: c %r4, 1020(%r3)
  49 # CHECK: je [[LABEL]]
  50 # CHECK: c %r4, 1024(%r3)
  51 # CHECK: jge [[LABEL]]
  52 # CHECK: c %r4, 1028(%r3)
  53 # CHECK: jge [[LABEL]]
  54 # CHECK: c %r4, 1032(%r3)
  55 # CHECK: jge [[LABEL]]
  56 # CHECK: c %r4, 1036(%r3)
  57 # CHECK: jge [[LABEL]]
  58
  59 from __future__ import print_function
  60
  61 blocks = 256 + 4
  62
  63 print("define void @f1(i8 *%base, i32 *%stop, i32 %limit) {")
  64 print("entry:")
  65 print("  br label %b0")
  66 print("")
  67
  68 a, b = 1, 1
  69 for i in range(blocks):
  70     a, b = b, a + b
  71     value = a % 256
  72     next = "b%d" % (i + 1) if i + 1 < blocks else "end"
  73     other = "end" if 2 * i < blocks else "b0"
  74     print("b%d:" % i)
  75     print("  store volatile i8 %d, i8 *%%base" % value)
  76     print("  %%astop%d = getelementptr i32, i32 *%%stop, i64 %d" % (i, i))
  77     print("  %%acur%d = load i32 , i32 *%%astop%d" % (i, i))
  78     print("  %%atest%d = icmp eq i32 %%limit, %%acur%d" % (i, i))
  79     print("  br i1 %%atest%d, label %%%s, label %%%s" % (i, other, next))
  80
  81 print("")
  82 print("%s:" % next)
  83 print("  ret void")
  84 print("}")