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Fix partial register handling - removes pointless loads when writing to non-32-bit registers (eg FPU or MMX).

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This commit is contained in:
SarahW 2018-11-27 19:43:01 +00:00
commit c1565eb42f
2 changed files with 34 additions and 5 deletions
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33
src/codegen_reg.c
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@ -73,7 +73,7 @@ struct
[IREG_ea_seg] = {REG_POINTER, &cpu_state.ea_seg, REG_INTEGER},
[IREG_op32] = {REG_DWORD, &cpu_state.op32, REG_INTEGER},
[IREG_ssegs] = {REG_BYTE, &cpu_state.ssegs, REG_INTEGER},
[IREG_ssegsx] = {REG_BYTE, &cpu_state.ssegs, REG_INTEGER},
[IREG_rm_mod_reg] = {REG_DWORD, &cpu_state.rm_data.rm_mod_reg_data, REG_INTEGER},
@ -147,6 +147,33 @@ struct
[IREG_temp1d] = {REG_DOUBLE, (void *)48, REG_FP},
};
static int reg_is_native_size(ir_reg_t ir_reg)
{
int native_size = ireg_data[IREG_GET_REG(ir_reg.reg)].native_size;
int requested_size = IREG_GET_SIZE(ir_reg.reg);
switch (native_size)
{
case REG_BYTE: case REG_FPU_ST_BYTE:
return (requested_size == IREG_SIZE_B);
case REG_WORD:
return (requested_size == IREG_SIZE_W);
case REG_DWORD:
return (requested_size == IREG_SIZE_L);
case REG_QWORD: case REG_FPU_ST_QWORD: case REG_DOUBLE: case REG_FPU_ST_DOUBLE:
return ((requested_size == IREG_SIZE_D) || (requested_size == IREG_SIZE_Q));
case REG_POINTER:
if (sizeof(void *) == 4)
return (requested_size == IREG_SIZE_L);
return (requested_size == IREG_SIZE_Q);
default:
fatal("get_reg_is_native_size: unknown native size %i\n", native_size);
}
return 0;
}
void codegen_reg_reset()
{
int c;
@ -260,7 +287,7 @@ static void codegen_reg_load(host_reg_set_t *reg_set, codeblock_t *block, int c,
break;
default:
fatal("codegen_reg_load - native_size=%i\n", ireg_data[IREG_GET_REG(ir_reg.reg)].native_size);
fatal("codegen_reg_load - native_size=%i reg=%i\n", ireg_data[IREG_GET_REG(ir_reg.reg)].native_size, IREG_GET_REG(ir_reg.reg));
}
reg_set->regs[c] = ir_reg;
@ -469,7 +496,7 @@ ir_host_reg_t codegen_reg_alloc_write_reg(codeblock_t *block, ir_reg_t ir_reg)
host_reg_set_t *reg_set = get_reg_set(ir_reg);
int c;
if (IREG_GET_SIZE(ir_reg.reg) != IREG_SIZE_L)
if (!reg_is_native_size(ir_reg))
{
/*Read in parent register so we can do partial accesses to it*/
ir_reg_t parent_reg;

6
src/codegen_reg.h
View file

@ -37,7 +37,7 @@ enum
IREG_eaaddr = 14,
IREG_ea_seg = 15,
IREG_op32 = 16,
IREG_ssegs = 17,
IREG_ssegsx = 17,
IREG_rm_mod_reg = 18,
@ -179,7 +179,9 @@ enum
IREG_MM7 = IREG_MM7x + IREG_SIZE_Q,
IREG_NPXC = IREG_NPXCx + IREG_SIZE_W,
IREG_NPXS = IREG_NPXSx + IREG_SIZE_W
IREG_NPXS = IREG_NPXSx + IREG_SIZE_W,
IREG_ssegs = IREG_ssegsx + IREG_SIZE_B
};
#define IREG_8(reg) (((reg) & 4) ? (((reg) & 3) + IREG_AH) : ((reg) + IREG_AL))