* 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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@89441
138bc75d-0d04-0410-961f-
82ee72b054a4
+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.
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);
{
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;
+}
((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) \