diff options
| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/caller-save.c | 2 | ||||
| -rw-r--r-- | gcc/regs.h | 6 | ||||
| -rw-r--r-- | gcc/tm.texi | 8 |
4 files changed, 22 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 48e72c0..5e224d7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/caller-save.c b/gcc/caller-save.c index 4a2deb6..60011f7 100644 --- a/gcc/caller-save.c +++ b/gcc/caller-save.c @@ -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; @@ -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. */ diff --git a/gcc/tm.texi b/gcc/tm.texi index ea3e8b3..a42eb67 100644 --- a/gcc/tm.texi +++ b/gcc/tm.texi @@ -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 |