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Implement P6 operand & address size prefix penalties.

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This commit is contained in:
SarahW 2020-10-21 20:07:37 +01:00
commit b40cc2b87e
1 changed files with 15 additions and 1 deletions
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16
src/codegen_timing_p6.c
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@ -1692,6 +1692,7 @@ static int fpu_st_timestamp[8];
static int last_uop_timestamp = 0; static int last_uop_timestamp = 0;
static int ifetch_length = 0; static int ifetch_length = 0;
static int has_66_prefix, has_67_prefix;
static void decode_flush() static void decode_flush()
{ {
@ -1787,9 +1788,16 @@ static void decode_instruction(const p6_instruction_t *ins, uint64_t deps, uint3
uint32_t regmask_required; uint32_t regmask_required;
uint32_t regmask_modified; uint32_t regmask_modified;
int c, d; int c, d;
int earliest_start = 0; int earliest_start;
int instr_length = codegen_timing_instr_length(deps, fetchdat, op_32); int instr_length = codegen_timing_instr_length(deps, fetchdat, op_32);
if (has_66_prefix && (deps & HAS_IMM1632))
decode_timestamp += 2;
if (has_67_prefix && (deps & MODRM))
decode_timestamp += 4;
earliest_start = decode_timestamp;
/*Generate input register mask, and determine the earliest time this /*Generate input register mask, and determine the earliest time this
instruction can start. This is not accurate, as this is calculated per instruction can start. This is not accurate, as this is calculated per
x86 instruction when it should be handled per uop*/ x86 instruction when it should be handled per uop*/
@ -1957,6 +1965,8 @@ void codegen_timing_p6_start()
// nr_units = NR_P6_UNITS; // nr_units = NR_P6_UNITS;
last_prefix = 0; last_prefix = 0;
prefixes = 0; prefixes = 0;
has_66_prefix = 0;
has_67_prefix = 0;
} }
/*Prefixes : /*Prefixes :
@ -1968,6 +1978,10 @@ void codegen_timing_p6_prefix(uint8_t prefix, uint32_t fetchdat)
{ {
if (last_prefix) /*First prefix is free*/ if (last_prefix) /*First prefix is free*/
decode_timestamp++; decode_timestamp++;
if (prefix == 0x66)
has_66_prefix = 1;
if (prefix == 0x67)
has_67_prefix = 1;
last_prefix = prefix; last_prefix = prefix;
prefixes++; prefixes++;