gnu/packages/patches/gcc-arm-bug-71399.patch

   1 Revert the following commit to work around a bootstrap comparison failure on
   2 ARMv7, as reported at <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71399>.
   3
   4 commit f6ab85b7049a03962ea98924d00802da357a1ad3
   5 Author: renlin <renlin@138bc75d-0d04-0410-961f-82ee72b054a4>
   6 Date:   Wed Dec 2 14:06:31 2015 +0000
   7
   8     [PR67383][ARM][4.9]Backport of "Allow any register for DImode values in Thumb2"
   9
  10     This partially fix PR67383. It allows the reload more flexibility to choose
  11     spilling pseudo registers.
  12
  13
  14     gcc/ChangeLog:
  15
  16     2015-12-02  Renlin Li  <renlin.li@arm.com>
  17
  18             Backport from mainline.
  19             2014-04-22  Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
  20
  21             * config/arm/arm.c (arm_hard_regno_mode_ok): Loosen
  22             restrictions on core registers for DImode values in Thumb2.
  23
  24
  25     git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@231177 138bc75d-0d04-0410-961f-82ee72b054a4
  26
  27 diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
  28 index 8ba6060..d9028a1 100644
  29 --- b/gcc/config/arm/arm.c
  30 +++ a/gcc/config/arm/arm.c
  31 @@ -22624,19 +22624,12 @@
  32      }
  33
  34    /* We allow almost any value to be stored in the general registers.
  35 -     Restrict doubleword quantities to even register pairs in ARM state
  36 -     so that we can use ldrd.  Do not allow very large Neon structure
  37 -     opaque modes in general registers; they would use too many.  */
  38 +     Restrict doubleword quantities to even register pairs so that we can
  39 +     use ldrd.  Do not allow very large Neon structure opaque modes in
  40 +     general registers; they would use too many.  */
  41    if (regno <= LAST_ARM_REGNUM)
  42 -    {
  43 -      if (ARM_NUM_REGS (mode) > 4)
  44 -         return FALSE;
  45 -
  46 -      if (TARGET_THUMB2)
  47 -       return TRUE;
  48 -
  49 -      return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0);
  50 -    }
  51 +    return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0)
  52 +      && ARM_NUM_REGS (mode) <= 4;
  53
  54    if (regno == FRAME_POINTER_REGNUM
  55        || regno == ARG_POINTER_REGNUM)