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i386.h (struct_processor_costs): New fileds int_load, int_store, fp_move, fp_load and fp_store

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* i386.h (struct_processor_costs): New fileds int_load, int_store, fp_move,
	fp_load and fp_store
	(REGISTER_MOVE_COST): Fix comment, calculate exactly the cost of
	fp->int moves
	(MEMORY_MOVE_COST): New macro.
	* i386.c (386_cost): Define new fields.
	(i486_cost): Likewise.
	(pentium_cost): Likewise.
	(pentiumpro_cost): Likewise.
	(k6_cost): Likewise.

From-SVN: r30585
This commit is contained in:
Jan Hubicka 1999-11-19 09:12:18 +00:00 committed by Jan Hubicka
parent 25b540c639
commit 96e7ae40d8
3 changed files with 97 additions and 17 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
Fri Nov 18 13:39:22 CET 1999 Jam Hubicka <hubicka@freesoft.cz>
* i386.h (struct_processor_costs): New fileds int_load, int_store, fp_move,
fp_load and fp_store
(REGISTER_MOVE_COST): Fix comment, calculate exactly the cost of
fp->int moves
(MEMORY_MOVE_COST): New macro.
* i386.c (386_cost): Define new fields.
(i486_cost): Likewise.
(pentium_cost): Likewise.
(pentiumpro_cost): Likewise.
(k6_cost): Likewise.
Fri Nov 19 11:11:55 1999 Greg McGary <gkm@gnu.org>
Geoffrey Keating <geoffk@cygnus.com>

50
gcc/config/i386/i386.c
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@ -63,7 +63,15 @@ struct processor_costs i386_cost = { /* 386 specific costs */
6, /* cost of starting a multiply */
1, /* cost of multiply per each bit set */
23, /* cost of a divide/mod */
15 /* "large" insn */
15, /* "large" insn */
{2, 4, 2}, /* cost of loading integer registers
in QImode, HImode and SImode.
Relative to reg-reg move (2). */
{2, 4, 2}, /* cost of storing integer registers */
2, /* cost of reg,reg fld/fst */
{8, 8, 8}, /* cost of loading fp registers
in SFmode, DFmode and XFmode */
{8, 8, 8} /* cost of loading integer registers */
};
struct processor_costs i486_cost = { /* 486 specific costs */
@ -74,7 +82,15 @@ struct processor_costs i486_cost = { /* 486 specific costs */
12, /* cost of starting a multiply */
1, /* cost of multiply per each bit set */
40, /* cost of a divide/mod */
15 /* "large" insn */
15, /* "large" insn */
{2, 4, 2}, /* cost of loading integer registers
in QImode, HImode and SImode.
Relative to reg-reg move (2). */
{2, 4, 2}, /* cost of storing integer registers */
2, /* cost of reg,reg fld/fst */
{8, 8, 8}, /* cost of loading fp registers
in SFmode, DFmode and XFmode */
{8, 8, 8} /* cost of loading integer registers */
};
struct processor_costs pentium_cost = {
@ -85,7 +101,15 @@ struct processor_costs pentium_cost = {
11, /* cost of starting a multiply */
0, /* cost of multiply per each bit set */
25, /* cost of a divide/mod */
8 /* "large" insn */
8, /* "large" insn */
{2, 4, 2}, /* cost of loading integer registers
in QImode, HImode and SImode.
Relative to reg-reg move (2). */
{2, 4, 2}, /* cost of storing integer registers */
2, /* cost of reg,reg fld/fst */
{2, 2, 6}, /* cost of loading fp registers
in SFmode, DFmode and XFmode */
{4, 4, 6} /* cost of loading integer registers */
};
struct processor_costs pentiumpro_cost = {
@ -96,7 +120,15 @@ struct processor_costs pentiumpro_cost = {
1, /* cost of starting a multiply */
0, /* cost of multiply per each bit set */
17, /* cost of a divide/mod */
8 /* "large" insn */
8, /* "large" insn */
{4, 4, 4}, /* cost of loading integer registers
in QImode, HImode and SImode.
Relative to reg-reg move (2). */
{2, 2, 2}, /* cost of storing integer registers */
2, /* cost of reg,reg fld/fst */
{2, 2, 6}, /* cost of loading fp registers
in SFmode, DFmode and XFmode */
{4, 4, 6} /* cost of loading integer registers */
};
struct processor_costs k6_cost = {
@ -107,7 +139,15 @@ struct processor_costs k6_cost = {
3, /* cost of starting a multiply */
0, /* cost of multiply per each bit set */
18, /* cost of a divide/mod */
8 /* "large" insn */
8, /* "large" insn */
{4, 5, 4}, /* cost of loading integer registers
in QImode, HImode and SImode.
Relative to reg-reg move (2). */
{2, 3, 2}, /* cost of storing integer registers */
4, /* cost of reg,reg fld/fst */
{6, 6, 6}, /* cost of loading fp registers
in SFmode, DFmode and XFmode */
{4, 4, 4} /* cost of loading integer registers */
};
struct processor_costs *ix86_cost = &pentium_cost;

52
gcc/config/i386/i386.h
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@ -62,6 +62,16 @@ struct processor_costs {
int mult_bit; /* cost of multiply per each bit set */
int divide; /* cost of a divide/mod */
int large_insn; /* insns larger than this cost more */
int int_load[3]; /* cost of loading integer registers
in QImode, HImode and SImode relative
to reg-reg move (2). */
int int_store[3]; /* cost of storing integer register
in QImode, HImode and SImode */
int fp_move; /* cost of reg,reg fld/fst */
int fp_load[3]; /* cost of loading FP register
in SFmode, DFmode and XFmode */
int fp_store[3]; /* cost of storing FP register
in SFmode, DFmode and XFmode */
};
extern struct processor_costs *ix86_cost;
@ -1956,22 +1966,28 @@ while (0)
: REG_P (RTX) ? 1 \
: 2)
/* A C expression for the cost of moving data of mode M between a
register and memory. A value of 2 is the default; this cost is
relative to those in `REGISTER_MOVE_COST'.
/* A C expression for the cost of moving data from a register in class FROM to
one in class TO. The classes are expressed using the enumeration values
such as `GENERAL_REGS'. A value of 2 is the default; other values are
interpreted relative to that.
If moving between registers and memory is more expensive than
between two registers, you should define this macro to express the
relative cost.
It is not required that the cost always equal 2 when FROM is the same as TO;
on some machines it is expensive to move between registers if they are not
general registers.
On the i386, copying between floating-point and fixed-point
registers is expensive. */
registers is done trough memory.
Integer -> fp moves are noticeably slower than the opposite direction
because of the partial memory stall they cause. Give it an
arbitary high cost.
*/
#define REGISTER_MOVE_COST(CLASS1, CLASS2) \
(((FLOAT_CLASS_P (CLASS1) && ! FLOAT_CLASS_P (CLASS2)) \
|| (! FLOAT_CLASS_P (CLASS1) && FLOAT_CLASS_P (CLASS2))) ? 10 \
: 2)
((FLOAT_CLASS_P (CLASS1) && ! FLOAT_CLASS_P (CLASS2)) \
? (MEMORY_MOVE_COST (DFmode, CLASS1, 0) \
+ MEMORY_MOVE_COST (DFmode, CLASS2, 1)) \
: (! FLOAT_CLASS_P (CLASS1) && FLOAT_CLASS_P (CLASS2)) ? 10 : 2)
/* A C expression for the cost of moving data of mode M between a
register and memory. A value of 2 is the default; this cost is
@ -1981,7 +1997,19 @@ while (0)
between two registers, you should define this macro to express the
relative cost. */
/* #define MEMORY_MOVE_COST(M,C,I) 2 */
#define MEMORY_MOVE_COST(MODE,CLASS,IN) \
(FLOAT_CLASS_P (CLASS) \
? (GET_MODE_SIZE (MODE)==4 \
? (IN ? ix86_cost->fp_load[0] : ix86_cost->fp_store[0]) \
: (GET_MODE_SIZE (MODE)==8 \
? (IN ? ix86_cost->fp_load[1] : ix86_cost->fp_store[1]) \
: (IN ? ix86_cost->fp_load[2] : ix86_cost->fp_store[2]))) \
: (GET_MODE_SIZE (MODE)==1 \
? (IN ? ix86_cost->int_load[0] : ix86_cost->int_store[0]) \
: (GET_MODE_SIZE (MODE)==2 \
? (IN ? ix86_cost->int_load[1] : ix86_cost->int_store[1]) \
: ((IN ? ix86_cost->int_load[2] : ix86_cost->int_store[2]) \
* GET_MODE_SIZE (MODE) / 4))))
/* A C expression for the cost of a branch instruction. A value of 1
is the default; other values are interpreted relative to that. */