toolchain/gcc/patches/7.3.0/001-revert_register_mode_search.patch

   1 commit 31285a20390a5e53a74a2a71d1b5c82f366ddd5a
   2 Author: Felix Fietkau <nbd@openwrt.org>
   3 Date:   Tue May 6 11:49:05 2014 +0000
   4
   5     gcc: revert an upstream patch that is causing a regression on powerpc
   6
   7     https://forum.openwrt.org/viewtopic.php?pid=232494#p232494
   8
   9     Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  10
  11     SVN-Revision: 40709
  12
  13 Revert of:
  14
  15 commit 275035b56823b26d5fb7e90fad945b998648edf2
  16 Author: bergner <bergner@138bc75d-0d04-0410-961f-82ee72b054a4>
  17 Date:   Thu Sep 5 14:09:07 2013 +0000
  18
  19         PR target/58139
  20         * reginfo.c (choose_hard_reg_mode): Scan through all mode classes
  21         looking for widest mode.
  22
  23
  24     git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202286 138bc75d-0d04-0410-961f-82ee72b054a4
  25
  26
  27 --- a/gcc/reginfo.c
  28 +++ b/gcc/reginfo.c
  29 @@ -637,35 +637,40 @@ choose_hard_reg_mode (unsigned int regno
  30         mode = GET_MODE_WIDER_MODE (mode))
  31      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  32         && HARD_REGNO_MODE_OK (regno, mode)
  33 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  34 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  35 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  36        found_mode = mode;
  37
  38 +  if (found_mode != VOIDmode)
  39 +    return found_mode;
  40 +
  41    for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
  42         mode != VOIDmode;
  43         mode = GET_MODE_WIDER_MODE (mode))
  44      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  45         && HARD_REGNO_MODE_OK (regno, mode)
  46 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  47 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  48 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  49        found_mode = mode;
  50
  51 +  if (found_mode != VOIDmode)
  52 +    return found_mode;
  53 +
  54    for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
  55         mode != VOIDmode;
  56         mode = GET_MODE_WIDER_MODE (mode))
  57      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  58         && HARD_REGNO_MODE_OK (regno, mode)
  59 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  60 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  61 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  62        found_mode = mode;
  63
  64 +  if (found_mode != VOIDmode)
  65 +    return found_mode;
  66 +
  67    for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
  68         mode != VOIDmode;
  69         mode = GET_MODE_WIDER_MODE (mode))
  70      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  71         && HARD_REGNO_MODE_OK (regno, mode)
  72 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  73 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  74 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  75        found_mode = mode;
  76
  77    if (found_mode != VOIDmode)