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re PR target/19378 (ICE during bootstrap compiling __fixdfdi)

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PR middle-end/19378
	* config/avr/avr.c (avr_hard_regno_mode_ok): Rewrite.

From-SVN: r94102
This commit is contained in:
Roger Sayle 2005-01-23 04:51:28 +00:00 • committed by Roger Sayle
parent 0e69bba9fc
commit d2ebe27c9a
2 changed files with 16 additions and 12 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-01-22 Roger Sayle <roger@eyesopen.com>
PR middle-end/19378
* config/avr/avr.c (avr_hard_regno_mode_ok): Rewrite.
2005-01-22 Richard Henderson <rth@redhat.com>
PR target/19506

23
gcc/config/avr/avr.c
View file

@ -5121,23 +5121,22 @@ jump_over_one_insn_p (rtx insn, rtx dest)
int
avr_hard_regno_mode_ok (int regno, enum machine_mode mode)
{
/* Bug workaround: recog.c (peep2_find_free_register) and probably
a few other places assume that the frame pointer is a single hard
register, so r29 may be allocated and overwrite the high byte of
the frame pointer. Do not allow any value to start in r29. */
if (regno == REG_Y + 1)
return 0;
/* The only thing that can go into registers r28:r29 is a Pmode. */
if (regno == REG_Y && mode == Pmode)
return 1;
/* Reload can use r28:r29 for reload register and for frame pointer
in one insn. It's wrong. We must disable it. */
if (mode != Pmode && reload_in_progress && frame_pointer_required_p ()
&& regno <= REG_Y && (regno + GET_MODE_SIZE (mode)) >= (REG_Y + 1))
/* Otherwise disallow all regno/mode combinations that span r28:r29. */
if (regno <= (REG_Y + 1) && (regno + GET_MODE_SIZE (mode)) >= (REG_Y + 1))
return 0;
if (mode == QImode)
return 1;
/* if (regno < 24 && !AVR_ENHANCED)
return 1;*/
/* Modes larger than QImode occupy consecutive registers. */
if (regno + GET_MODE_SIZE (mode) > FIRST_PSEUDO_REGISTER)
return 0;
/* All modes larger than QImode should start in an even register. */
return !(regno & 1);
}