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m68k.h (HARD_REGNO_RENAME_OK): New macro.

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* config/m68k/m68k.h (HARD_REGNO_RENAME_OK): New macro.
	* config/m68k/m68k.c (m68k_hard regno_rename_ok): Disallow
	renaming of non-live registers in interrupt functions.
	* config/m68k/m68k-protos.h (m68k_hard_regno_rename_ok): Add prototype.

From-SVN: r89441
This commit is contained in:
Peter Barada 2004-10-22 12:47:24 +00:00 committed by Bernardo Innocenti
parent 76aebc9f3e
commit cfca21cb61
4 changed files with 32 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-10-22 Peter Barada <peter@the-baradas.com>
* config/m68k/m68k.h (HARD_REGNO_RENAME_OK): New macro.
* config/m68k/m68k.c (m68k_hard regno_rename_ok): Disallow
renaming of non-live registers in interrupt functions.
* config/m68k/m68k-protos.h (m68k_hard_regno_rename_ok): Add prototype.
2004-10-22 Zdenek Dvorak <dvorakz@suse.cz>
* tree-ssa-loop-niter.c (inverse): Count in HOST_WIDE_INT if possible.

2
gcc/config/m68k/m68k-protos.h
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@ -50,9 +50,11 @@ extern void print_operand_address (FILE *, rtx);
extern void print_operand (FILE *, rtx, int);
extern void notice_update_cc (rtx, rtx);
extern rtx legitimize_pic_address (rtx, enum machine_mode, rtx);
#endif /* RTX_CODE */
extern int flags_in_68881 (void);
extern bool use_return_insn (void);
extern void override_options (void);
extern void init_68881_table (void);
extern int m68k_hard_regno_rename_ok(unsigned int, unsigned int);

17
gcc/config/m68k/m68k.c
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@ -3428,3 +3428,20 @@ m68k_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED,
{
return gen_rtx_REG (Pmode, M68K_STRUCT_VALUE_REGNUM);
}
/* Return nonzero if register old_reg can be renamed to register new_reg. */
int
m68k_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 (m68k_interrupt_function_p (current_function_decl)
&& !regs_ever_live[new_reg])
return 0;
return 1;
}

6
gcc/config/m68k/m68k.h
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@ -480,6 +480,12 @@ extern int target_flags;
((REGNO) >= 16 ? GET_MODE_NUNITS (MODE) \
: ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
/* A C expression that is nonzero if hard register NEW_REG can be
considered for use as a rename register for OLD_REG register. */
#define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
m68k_hard_regno_rename_ok (OLD_REG, NEW_REG)
/* On the m68k, the cpu registers can hold any mode but the 68881 registers
can hold only SFmode or DFmode. */
#define HARD_REGNO_MODE_OK(REGNO, MODE) \