toolchain/gcc/patches/arc-2016.09-release/001-revert_register_mode_search.patch

   1 Revert of:
   2
   3 commit 275035b56823b26d5fb7e90fad945b998648edf2
   4 Author: bergner <bergner@138bc75d-0d04-0410-961f-82ee72b054a4>
   5 Date:   Thu Sep 5 14:09:07 2013 +0000
   6
   7         PR target/58139
   8         * reginfo.c (choose_hard_reg_mode): Scan through all mode classes
   9         looking for widest mode.
  10
  11
  12     git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202286 138bc75d-0d04-0410-961f-82ee72b054a4
  13
  14
  15 --- a/gcc/reginfo.c
  16 +++ b/gcc/reginfo.c
  17 @@ -625,35 +625,40 @@ choose_hard_reg_mode (unsigned int regno
  18         mode = GET_MODE_WIDER_MODE (mode))
  19      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  20         && HARD_REGNO_MODE_OK (regno, mode)
  21 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  22 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  23 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  24        found_mode = mode;
  25
  26 +  if (found_mode != VOIDmode)
  27 +    return found_mode;
  28 +
  29    for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
  30         mode != VOIDmode;
  31         mode = GET_MODE_WIDER_MODE (mode))
  32      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  33         && HARD_REGNO_MODE_OK (regno, mode)
  34 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  35 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  36 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  37        found_mode = mode;
  38
  39 +  if (found_mode != VOIDmode)
  40 +    return found_mode;
  41 +
  42    for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
  43         mode != VOIDmode;
  44         mode = GET_MODE_WIDER_MODE (mode))
  45      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  46         && HARD_REGNO_MODE_OK (regno, mode)
  47 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  48 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  49 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  50        found_mode = mode;
  51
  52 +  if (found_mode != VOIDmode)
  53 +    return found_mode;
  54 +
  55    for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
  56         mode != VOIDmode;
  57         mode = GET_MODE_WIDER_MODE (mode))
  58      if ((unsigned) hard_regno_nregs[regno][mode] == nregs
  59         && HARD_REGNO_MODE_OK (regno, mode)
  60 -       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
  61 -       && GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
  62 +       && (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
  63        found_mode = mode;
  64
  65    if (found_mode != VOIDmode)