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avr.c (avr_hard_regno_mode_ok): Do not allow r29 which may overwrite the high byte of the frame pointer. 

* config/avr/avr.c (avr_hard_regno_mode_ok): Do not allow r29
	which may overwrite the high byte of the frame pointer.

From-SVN: r50138
This commit is contained in:
Marek Michalkiewicz 2002-02-28 16:23:54 +01:00 committed by Marek Michalkiewicz
parent 9b420a6a58
commit b96c434c39
2 changed files with 12 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-02-28 Marek Michalkiewicz <marekm@amelek.gda.pl>
* config/avr/avr.c (avr_hard_regno_mode_ok): Do not allow r29
which may overwrite the high byte of the frame pointer.
2002-02-28 Bo Thorsen <bo@suse.de>
* config/i386/linux64.h (LINK_SPEC): Fix 32/64 bit compilation.

7
gcc/config/avr/avr.c
View File

@ -5210,6 +5210,13 @@ avr_hard_regno_mode_ok (regno, mode)
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;
if (mode == QImode)
return 1;
/* if (regno < 24 && !AVR_ENHANCED)