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m68hc11.c (m6812_cost): Make cost of add higher than a shift to avoid adding a register with itself.

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* config/m68hc11/m68hc11.c (m6812_cost): Make cost of add higher
	than a shift to avoid adding a register with itself.
	(m68hc11_memory_move_cost): Take into account NO_REGS.
	(m68hc11_register_move_cost): Update and use memory move cost
	for soft registers.
	(m68hc11_address_cost): Make cost of valid offset not 0 so that
	it gives more opportunities to cse to optimize.
	* config/m68hc11/m68hc11.h (REGISTER_MOVE_COST): Pass the mode.
	* config/m68hc11/m68hc11-protos.h (m68hc11_register_move_cost): Update.

From-SVN: r50833
This commit is contained in:
Stephane Carrez 2002-03-15 22:27:01 +01:00 committed by Stephane Carrez
parent 45061554e7
commit a0ccf503a8
4 changed files with 35 additions and 18 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2002-03-15 Stephane Carrez <Stephane.Carrez@worldnet.fr>
* config/m68hc11/m68hc11.c (m6812_cost): Make cost of add higher
than a shift to avoid adding a register with itself.
(m68hc11_memory_move_cost): Take into account NO_REGS.
(m68hc11_register_move_cost): Update and use memory move cost
for soft registers.
(m68hc11_address_cost): Make cost of valid offset not 0 so that
it gives more opportunities to cse to optimize.
* config/m68hc11/m68hc11.h (REGISTER_MOVE_COST): Pass the mode.
* config/m68hc11/m68hc11-protos.h (m68hc11_register_move_cost): Update.
2002-03-15 Mark Mitchell <mark@codesourcery.com>
* c-common.c (statement_code_p): Handle CLEANUP_STMT.

5
gcc/config/m68hc11/m68hc11-protos.h
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@ -1,5 +1,5 @@
/* Prototypes for exported functions defined in m68hc11.c
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Stephane Carrez (stcarrez@worldnet.fr)
This file is part of GNU CC.
@ -96,7 +96,8 @@ extern rtx m68hc11_gen_highpart PARAMS((enum machine_mode, rtx));
#ifdef HAVE_MACHINE_MODES
extern int m68hc11_memory_move_cost PARAMS((enum machine_mode, enum reg_class,
int));
extern int m68hc11_register_move_cost PARAMS((enum reg_class, enum reg_class));
extern int m68hc11_register_move_cost PARAMS((enum machine_mode,
enum reg_class, enum reg_class));
extern int m68hc11_rtx_costs PARAMS((rtx, enum rtx_code, enum rtx_code));
extern int m68hc11_address_cost PARAMS((rtx));

30
gcc/config/m68hc11/m68hc11.c
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@ -1,5 +1,5 @@
/* Subroutines for code generation on Motorola 68HC11 and 68HC12.
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Stephane Carrez (stcarrez@worldnet.fr)
This file is part of GNU CC.
@ -169,9 +169,9 @@ static const struct processor_costs m6811_cost = {
/* Costs for a 68HC12. */
static const struct processor_costs m6812_cost = {
/* add */
COSTS_N_INSNS (1),
COSTS_N_INSNS (2),
/* logical */
COSTS_N_INSNS (1),
COSTS_N_INSNS (2),
/* non-constant shift */
COSTS_N_INSNS (20),
/* shiftQI const */
@ -1173,9 +1173,8 @@ m68hc11_handle_fntype_attribute (node, name, args, flags, no_add_attrs)
handle calls to traps in a special manner (by issuing the trap).
This information is stored in SYMBOL_REF_FLAG. */
void
m68hc11_encode_section_info (decl, first)
m68hc11_encode_section_info (decl)
tree decl;
int first ATTRIBUTE_UNUSED;
{
tree func_attr;
int trap_handler;
@ -4919,7 +4918,7 @@ m68hc11_memory_move_cost (mode, class, in)
enum reg_class class;
int in ATTRIBUTE_UNUSED;
{
if (class <= H_REGS)
if (class <= H_REGS && class > NO_REGS)
{
if (GET_MODE_SIZE (mode) <= 2)
return COSTS_N_INSNS (1) + (reload_completed | reload_in_progress);
@ -4941,18 +4940,23 @@ m68hc11_memory_move_cost (mode, class, in)
have a move cost of 2. Setting a higher cost will force reload to check
the constraints. */
int
m68hc11_register_move_cost (from, to)
m68hc11_register_move_cost (mode, from, to)
enum machine_mode mode;
enum reg_class from;
enum reg_class to;
{
if (from >= S_REGS && to >= S_REGS)
/* All costs are symmetric, so reduce cases by putting the
lower number class as the destination. */
if (from < to)
{
return COSTS_N_INSNS (3);
enum reg_class tmp = to;
to = from, from = tmp;
}
if (from <= S_REGS && to <= S_REGS)
{
if (to >= S_REGS)
return m68hc11_memory_move_cost (mode, S_REGS, 0);
else if (from <= S_REGS)
return COSTS_N_INSNS (1) + (reload_completed | reload_in_progress);
}
else
return COSTS_N_INSNS (2);
}
@ -5002,7 +5006,7 @@ m68hc11_address_cost (addr)
else if (INTVAL (plus1) >= m68hc11_max_offset)
cost = 2;
else
cost = 0;
cost = 1;
if (REGNO (plus0) < FIRST_PSEUDO_REGISTER)
cost += 0;
else

2
gcc/config/m68hc11/m68hc11.h
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@ -1422,7 +1422,7 @@ extern unsigned char m68hc11_reg_valid_for_index[FIRST_PSEUDO_REGISTER];
/* Move costs between classes of registers */
#define REGISTER_MOVE_COST(MODE, CLASS1, CLASS2) \
(m68hc11_register_move_cost (CLASS1, CLASS2))
(m68hc11_register_move_cost (MODE, CLASS1, CLASS2))
/* Move cost between register and memory.
- Move to a 16-bit register is reasonable,