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backport: re PR other/53595 (Code size increase of +10% between two 4.7.1 snapshot) 

Backport from 2012-06-28 mainline r189049
	PR 53595
	* config/avr/avr.c (avr_hard_regno_call_part_clobbered): New.
	* config/avr/avr-protos.h (avr_hard_regno_call_part_clobbered): New.
	* config/avr/avr.h (HARD_REGNO_CALL_PART_CLOBBERED): Forward to
	avr_hard_regno_call_part_clobbered.

From-SVN: r189050
This commit is contained in:
Georg-Johann Lay 2012-06-28 13:58:32 +00:00 committed by Georg-Johann Lay
parent f89585af67
commit e5aaf7d69b
4 changed files with 35 additions and 4 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2012-06-28 Georg-Johann Lay <avr@gjlay.de>
Backport from 2012-06-28 mainline r189049
PR 53595
* config/avr/avr.c (avr_hard_regno_call_part_clobbered): New.
* config/avr/avr-protos.h (avr_hard_regno_call_part_clobbered): New.
* config/avr/avr.h (HARD_REGNO_CALL_PART_CLOBBERED): Forward to
avr_hard_regno_call_part_clobbered.
2012-06-28 Richard Guenther <rguenther@suse.de>
PR middle-end/53790

1
gcc/config/avr/avr-protos.h
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@ -47,6 +47,7 @@ extern void init_cumulative_args (CUMULATIVE_ARGS *cum, tree fntype,
#endif /* TREE_CODE */
#ifdef RTX_CODE
extern int avr_hard_regno_call_part_clobbered (unsigned, enum machine_mode);
extern const char *output_movqi (rtx insn, rtx operands[], int *l);
extern const char *output_movhi (rtx insn, rtx operands[], int *l);
extern const char *output_movsisf (rtx insn, rtx operands[], int *l);

22
gcc/config/avr/avr.c
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@ -8890,6 +8890,28 @@ avr_hard_regno_mode_ok (int regno, enum machine_mode mode)
}
/* Implement `HARD_REGNO_CALL_PART_CLOBBERED'. */
int
avr_hard_regno_call_part_clobbered (unsigned regno, enum machine_mode mode)
{
/* FIXME: This hook gets called with MODE:REGNO combinations that don't
represent valid hard registers like, e.g. HI:29. Returning TRUE
for such registers can lead to performance degradation as mentioned
in PR53595. Thus, report invalid hard registers as FALSE. */
if (!avr_hard_regno_mode_ok (regno, mode))
return 0;
/* Return true if any of the following boundaries is crossed:
17/18, 27/28 and 29/30. */
return ((regno < 18 && regno + GET_MODE_SIZE (mode) > 18)
|| (regno < REG_Y && regno + GET_MODE_SIZE (mode) > REG_Y)
|| (regno < REG_Z && regno + GET_MODE_SIZE (mode) > REG_Z));
}
/* Implement `MODE_CODE_BASE_REG_CLASS'. */
enum reg_class

6
gcc/config/avr/avr.h
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@ -394,10 +394,8 @@ enum reg_class {
#define REGNO_OK_FOR_INDEX_P(NUM) 0
#define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE) \
(((REGNO) < 18 && (REGNO) + GET_MODE_SIZE (MODE) > 18) \
|| ((REGNO) < REG_Y && (REGNO) + GET_MODE_SIZE (MODE) > REG_Y) \
|| ((REGNO) < REG_Z && (REGNO) + GET_MODE_SIZE (MODE) > REG_Z))
#define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE) \
avr_hard_regno_call_part_clobbered (REGNO, MODE)
#define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true