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regs.h (HARD_REGNO_CALLER_SAVE_MODE): New macro.

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* regs.h (HARD_REGNO_CALLER_SAVE_MODE): New macro.
        * caller-save.c (init_caller_save): Use it.
        * tm.texi: Document HARD_REGNO_CALLER_SAVE_MODE.

From-SVN: r22682
This commit is contained in:
Jeff Law 1998-09-30 11:21:12 -06:00
parent 5ae4c799f2
commit 8d5c8167c9
4 changed files with 22 additions and 2 deletions
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8
gcc/ChangeLog
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@ -1,4 +1,10 @@
Wed Sep 30 12:57:30 1998Zack Weinberg <zack@rabi.phys.columbia.edu>
Wed Sep 30 18:19:27 1998 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
* regs.h (HARD_REGNO_CALLER_SAVE_MODE): New macro.
* caller-save.c (init_caller_save): Use it.
* tm.texi: Document HARD_REGNO_CALLER_SAVE_MODE.
Wed Sep 30 12:57:30 1998 Zack Weinberg <zack@rabi.phys.columbia.edu>
* configure.in: Add --enable-cpplib option which uses cpplib
for cpp, but doesn't link cpplib into cc1. Make help text

2
gcc/caller-save.c
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@ -115,7 +115,7 @@ init_caller_save ()
{
for (j = 1; j <= MOVE_MAX / UNITS_PER_WORD; j++)
{
regno_save_mode[i][j] = choose_hard_reg_mode (i, j);
regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j);
if (regno_save_mode[i][j] == VOIDmode && j == 1)
{
call_fixed_regs[i] = 1;

6
gcc/regs.h
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@ -211,6 +211,12 @@ extern int caller_save_needed;
#define CLASS_LIKELY_SPILLED_P(CLASS) (reg_class_size[(int) (CLASS)] == 1)
#endif
/* Select a register mode required for caller save of hard regno REGNO. */
#ifndef HARD_REGNO_CALLER_SAVE_MODE
#define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS) \
choose_hard_reg_mode (REGNO, NREGS)
#endif
/* Allocated in local_alloc. */
/* A list of SCRATCH rtl allocated by local-alloc. */

8
gcc/tm.texi
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@ -3174,6 +3174,14 @@ this is worth doing, and 0 otherwise.
If you don't define this macro, a default is used which is good on most
machines: @code{4 * @var{calls} < @var{refs}}.
@findex HARD_REGNO_CALLER_SAVE_MODE
@item HARD_REGNO_CALLER_SAVE_MODE (@var{regno}, @var{nregs})
A C expression specifying which mode is required for saving @var{nregs}
of a pseudo-register in call-clobbered hard register @var{regno}. If
@var{regno} is unsuitable for caller save, @code{VOIDmode} should be
returned. For most machines this macro need not be defined since GCC
will select the smallest suitable mode.
@end table
@node Function Entry