procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

pru: Implement TARGET_CLASS_LIKELY_SPILLED_P to fix PR115013

Browse source 
Commit r15-436-g44e7855e did not fix PR115013 for PRU because
SMALL_REGISTER_CLASS_P is not returning an accurate value for the PRU
backend.

Word mode for PRU backend is defined as 8-bit, yet all ALU operations
are preferred in 32-bit mode.  Thus checking whether a register class
contains a single word_mode register would not classify the actually
single SImode register classes as small.  This affected the
multiplication source and destination register classes.

Fix by implementing TARGET_CLASS_LIKELY_SPILLED_P to treat all register
classes with SImode or smaller size as likely spilled.  This in turn
corrects the behaviour of SMALL_REGISTER_CLASS_P for PRU.

	PR rtl-optimization/115013

gcc/ChangeLog:

	* config/pru/pru.cc (pru_class_likely_spilled_p): Implement
	to mark classes containing one SImode register as likely
	spilled.
	(TARGET_CLASS_LIKELY_SPILLED_P): Define.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
This commit is contained in:
Dimitar Dimitrov 2024-05-13 19:24:14 +03:00
parent 4bfc4585c9
commit fc559584fa
1 changed files with 14 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
gcc/config/pru/pru.cc
View file

@ -517,6 +517,17 @@ pru_can_use_return_insn (void)
return cfun->machine->total_size == 0;
}
/* Implement `TARGET_CLASS_LIKELY_SPILLED_P'. The original intention
of the default implementation is kept, but is adjusted for PRU.
Return TRUE if the given class C contains a single SImode
(as opposed to word_mode!) register. */
static bool
pru_class_likely_spilled_p (reg_class_t c)
{
return (reg_class_size[(int) c] <= GET_MODE_SIZE (SImode));
}
/* Implement TARGET_HARD_REGNO_MODE_OK. */
static bool
@ -3181,6 +3192,9 @@ pru_unwind_word_mode (void)
#undef TARGET_CAN_ELIMINATE
#define TARGET_CAN_ELIMINATE pru_can_eliminate
#undef TARGET_CLASS_LIKELY_SPILLED_P
#define TARGET_CLASS_LIKELY_SPILLED_P pru_class_likely_spilled_p
#undef TARGET_HARD_REGNO_MODE_OK
#define TARGET_HARD_REGNO_MODE_OK pru_hard_regno_mode_ok