diff options
| author | Roger Sayle <roger@eyesopen.com> | 2006-01-18 02:48:17 +0000 |
|---|---|---|
| committer | Roger Sayle <roger@eyesopen.com> | 2006-01-18 02:48:17 +0000 |
| commit | f44144d2b4ecc8261bd216b56a4db5c0c62c90af (patch) | |
| tree | 1c0dbff3441372f8842a70d08c047e023d3cd63b | |
| parent | eb06d5156b61d46a4317bfbcb6b7596f64f2c53a (diff) | |
* 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.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@109867 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 51 |
2 files changed, 35 insertions, 24 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a096147bf73..562486cc3f2 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 7f8752f8099..f4838de8d4b 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -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); |