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i386.c (COSTS_N_BYTES): New macro.

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* config/i386/i386.c (COSTS_N_BYTES): New macro.
	(size_cost): Encode costs in bytes so that a reg-reg addition is
	equivalent to COSTS_N_INSNS(1).
	(override_options): Use the size_cost.branch_cost as the default
	ix86_branch_cost when optimizing for size.

From-SVN: r109867
This commit is contained in:
Roger Sayle 2006-01-18 02:48:17 +00:00 committed by Roger Sayle
parent c637eb15a2
commit 3dd0df7f13
2 changed files with 35 additions and 24 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2006-01-17 Roger Sayle <roger@eyesopen.com>
* config/i386/i386.c (COSTS_N_BYTES): New macro.
(size_cost): Encode costs in bytes so that a reg-reg addition is
equivalent to COSTS_N_INSNS(1).
(override_options): Use the size_cost.branch_cost as the default
ix86_branch_cost when optimizing for size.
2006-01-18 Ben Elliston <bje@au.ibm.com>
* Makefile.in (D32PBIT_FUNCS): New.

51
gcc/config/i386/i386.c
View File

@ -63,25 +63,28 @@ Boston, MA 02110-1301, USA. */
: 4)
/* Processor costs (relative to an add) */
/* We assume COSTS_N_INSNS is defined as (N)*4 and an addition is 2 bytes. */
#define COSTS_N_BYTES(N) ((N) * 2)
static const
struct processor_costs size_cost = { /* costs for tunning for size */
COSTS_N_INSNS (2), /* cost of an add instruction */
COSTS_N_INSNS (3), /* cost of a lea instruction */
COSTS_N_INSNS (2), /* variable shift costs */
COSTS_N_INSNS (3), /* constant shift costs */
{COSTS_N_INSNS (3), /* cost of starting multiply for QI */
COSTS_N_INSNS (3), /* HI */
COSTS_N_INSNS (3), /* SI */
COSTS_N_INSNS (3), /* DI */
COSTS_N_INSNS (5)}, /* other */
COSTS_N_BYTES (2), /* cost of an add instruction */
COSTS_N_BYTES (3), /* cost of a lea instruction */
COSTS_N_BYTES (2), /* variable shift costs */
COSTS_N_BYTES (3), /* constant shift costs */
{COSTS_N_BYTES (3), /* cost of starting multiply for QI */
COSTS_N_BYTES (3), /* HI */
COSTS_N_BYTES (3), /* SI */
COSTS_N_BYTES (3), /* DI */
COSTS_N_BYTES (5)}, /* other */
0, /* cost of multiply per each bit set */
{COSTS_N_INSNS (3), /* cost of a divide/mod for QI */
COSTS_N_INSNS (3), /* HI */
COSTS_N_INSNS (3), /* SI */
COSTS_N_INSNS (3), /* DI */
COSTS_N_INSNS (5)}, /* other */
COSTS_N_INSNS (3), /* cost of movsx */
COSTS_N_INSNS (3), /* cost of movzx */
{COSTS_N_BYTES (3), /* cost of a divide/mod for QI */
COSTS_N_BYTES (3), /* HI */
COSTS_N_BYTES (3), /* SI */
COSTS_N_BYTES (3), /* DI */
COSTS_N_BYTES (5)}, /* other */
COSTS_N_BYTES (3), /* cost of movsx */
COSTS_N_BYTES (3), /* cost of movzx */
0, /* "large" insn */
2, /* MOVE_RATIO */
2, /* cost for loading QImode using movzbl */
@ -106,13 +109,13 @@ struct processor_costs size_cost = { /* costs for tunning for size */
3, /* MMX or SSE register to integer */
0, /* size of prefetch block */
0, /* number of parallel prefetches */
1, /* Branch cost */
COSTS_N_INSNS (2), /* cost of FADD and FSUB insns. */
COSTS_N_INSNS (2), /* cost of FMUL instruction. */
COSTS_N_INSNS (2), /* cost of FDIV instruction. */
COSTS_N_INSNS (2), /* cost of FABS instruction. */
COSTS_N_INSNS (2), /* cost of FCHS instruction. */
COSTS_N_INSNS (2), /* cost of FSQRT instruction. */
2, /* Branch cost */
COSTS_N_BYTES (2), /* cost of FADD and FSUB insns. */
COSTS_N_BYTES (2), /* cost of FMUL instruction. */
COSTS_N_BYTES (2), /* cost of FDIV instruction. */
COSTS_N_BYTES (2), /* cost of FABS instruction. */
COSTS_N_BYTES (2), /* cost of FCHS instruction. */
COSTS_N_BYTES (2), /* cost of FSQRT instruction. */
};
/* Processor costs (relative to an add) */
@ -1601,7 +1604,7 @@ override_options (void)
}
/* Validate -mbranch-cost= value, or provide default. */
ix86_branch_cost = processor_target_table[ix86_tune].cost->branch_cost;
ix86_branch_cost = ix86_cost->branch_cost;
if (ix86_branch_cost_string)
{
i = atoi (ix86_branch_cost_string);