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re PR target/36424 (avr-gcc use don't saved registers in ISR with -O3 ('-frename-registers' ) optimization)

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PR target/36424
	* config/avr/avr.h (HARD_REGNO_RENAME_OK): Define.
	* config/avr/avr.c (avr_hard_regno_rename_ok): New function. 
	* config/avr/avr-protos.h (avr_hard_regno_rename_ok): New prototype.

From-SVN: r136562
This commit is contained in:
Anatoly Sokolov 2008-06-08 20:08:08 +04:00 committed by Anatoly Sokolov
parent 929a75b24f
commit 91635d0806
4 changed files with 28 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2008-07-08 Anatoly Sokolov <aesok@post.ru>
PR target/36424
* config/avr/avr.h (HARD_REGNO_RENAME_OK): Define.
* config/avr/avr.c (avr_hard_regno_rename_ok): New function.
* config/avr/avr-protos.h (avr_hard_regno_rename_ok): New prototype.
2008-06-07 Danny Smith <dannysmith@users.sourceforge.net>
* config/i386/cygming.h (MAYBE_UWIN_CPP_BUILTINS): Remove.

1
gcc/config/avr/avr-protos.h
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@ -37,6 +37,7 @@ extern int initial_elimination_offset (int from, int to);
extern int avr_simple_epilogue (void);
extern void gas_output_limited_string (FILE *file, const char *str);
extern void gas_output_ascii (FILE *file, const char *str, size_t length);
extern int avr_hard_regno_rename_ok (unsigned int, unsigned int);
#ifdef TREE_CODE
extern void asm_output_external (FILE *file, tree decl, char *name);

17
gcc/config/avr/avr.c
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@ -5916,6 +5916,23 @@ avr_peep2_scratch_safe (rtx scratch)
return 1;
}
/* Return nonzero if register OLD_REG can be renamed to register NEW_REG. */
int
avr_hard_regno_rename_ok (unsigned int old_reg ATTRIBUTE_UNUSED,
unsigned int new_reg)
{
/* Interrupt functions can only use registers that have already been
saved by the prologue, even if they would normally be
call-clobbered. */
if ((cfun->machine->is_interrupt || cfun->machine->is_signal)
&& !df_regs_ever_live_p (new_reg))
return 0;
return 1;
}
/* Output a branch that tests a single bit of a register (QI, HI or SImode)
or memory location in the I/O space (QImode only).

3
gcc/config/avr/avr.h
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@ -1026,6 +1026,9 @@ mmcu=*:-mmcu=%*}"
#define OBJECT_FORMAT_ELF
#define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
/* A C structure for machine-specific, per-function data.
This is added to the cfun structure. */
struct machine_function GTY(())