/packages/toolchain/lang/gcc/patches/gcc-4.6.2-PR48805_Do_not_instantiate_ADDR_EXPRs.patch

http://github.com/OpenELEC/OpenELEC.tv · Patch · 89 lines · 80 code · 9 blank · 0 comment · 0 complexity · 1cae8ecc833250f3e8e69ca396b5d31f MD5 · raw file

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  13. From: Sebastian Pop <sebpop at gmail dot com>
  14. To: gcc-patches at gcc dot gnu dot org
  15. Cc: rguenther at suse dot de, Sebastian Pop <sebpop at gmail dot com>
  16. Subject: [PATCH] Fix PR48805: Do not instantiate ADDR_EXPRs
  17. Date: Sat, 23 Jul 2011 09:35:56 -0500
  18. Message-Id: <1311431756-16262-1-git-send-email-sebpop@gmail.com>
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  28. With this patch we avoid instantiating ADDR_EXPR: it makes no sense
  29. to translate b[i] into b[{0, +, 1}_1].
  30. Bootstrapped and tested on amd64-linux.
  31. 2011-07-22 Sebastian Pop <sebastian.pop@amd.com>
  32. PR middle-end/48805
  33. * tree-scalar-evolution.c (instantiate_scev_r): Return
  34. chrec_dont_know for ADDR_EXPR.
  35. * gcc.dg/graphite/id-pr48805.c: New.
  36. ---
  37. gcc/ChangeLog | 6 ++++++
  38. gcc/testsuite/ChangeLog | 5 +++++
  39. gcc/testsuite/gcc.dg/graphite/id-pr48805.c | 20 ++++++++++++++++++++
  40. gcc/tree-scalar-evolution.c | 1 +
  41. 4 files changed, 32 insertions(+), 0 deletions(-)
  42. create mode 100644 gcc/testsuite/gcc.dg/graphite/id-pr48805.c
  43. diff --git a/gcc/testsuite/gcc.dg/graphite/id-pr48805.c b/gcc/testsuite/gcc.dg/graphite/id-pr48805.c
  44. new file mode 100644
  45. index 0000000..f13a828
  46. --- /dev/null
  47. +++ b/gcc/testsuite/gcc.dg/graphite/id-pr48805.c
  48. @@ -0,0 +1,20 @@
  49. +void *A(const void *a);
  50. +void C(void);
  51. +
  52. +static void B(unsigned short a[])
  53. +{
  54. + long i, j, tmp;
  55. +
  56. + for(i = 0; i < 3; i++) {
  57. + for(j = 1; j <= 3; j++)
  58. + tmp -= a[i - j];
  59. +
  60. + a[i] = (unsigned short)(tmp >> 1);
  61. + }
  62. +}
  63. +void C(void)
  64. +{
  65. + unsigned short a[3], b[3];
  66. + B(b + 1);
  67. + A(a);
  68. +}
  69. diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c
  70. index bfa8c93..00fcd3f 100644
  71. --- a/gcc/tree-scalar-evolution.c
  72. +++ b/gcc/tree-scalar-evolution.c
  73. @@ -2645,6 +2645,7 @@ instantiate_scev_r (basic_block instantiate_below,
  74. TREE_OPERAND (chrec, 0),
  75. fold_conversions, cache, size_expr);
  76. + case ADDR_EXPR:
  77. case SCEV_NOT_KNOWN:
  78. return chrec_dont_know;
  79. --
  80. 1.7.4.1