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api: Store index register in operand struct

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Combined with some reordering of the struct fields, this reduces the
size of an FdInstr from 56 bytes to 48 bytes.
This commit is contained in:
Alexis Engelke
2020-05-17 11:16:48 +02:00
parent 7a364fcada
commit c3df15e19b
2 changed files with 11 additions and 11 deletions
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17
fadec.h
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@@ -82,7 +82,7 @@ typedef enum {
typedef struct {
uint8_t type;
uint8_t size;
int8_t reg;
uint8_t reg;
uint8_t misc;
} FdOp;
@@ -92,12 +92,13 @@ typedef struct {
uint8_t segment;
uint8_t addrsz;
uint8_t operandsz;
uint8_t size;
uint8_t _pad0;
FdOp operands[4];
uint8_t idx_reg;
uint8_t idx_scale;
uint8_t size;
intptr_t disp;
int32_t disp;
uint32_t _pad1;
intptr_t imm;
uintptr_t address;
@@ -192,16 +193,16 @@ void fd_format(const FdInstr* instr, char* buf, size_t len);
/** Gets the index of the index register from a memory operand, or FD_REG_NONE,
* if the memory operand has no scaled index register.
* Only valid if FD_OP_TYPE == FD_OT_MEM **/
#define FD_OP_INDEX(instr,idx) ((FdReg) (instr)->idx_reg)
#define FD_OP_INDEX(instr,idx) ((FdReg) (instr)->operands[idx].misc & 0x3f)
/** Gets the scale of the index register from a memory operand when existent.
* This does /not/ return the scale in an absolute value but returns the amount
* of bits the index register is shifted to the left (i.e. the value in in the
* range 0-3). The actual scale can be computed easily using 1<<FD_OP_SCALE.
* Only valid if FD_OP_TYPE == FD_OT_MEM and FD_OP_INDEX != FD_REG_NONE **/
#define FD_OP_SCALE(instr,idx) ((instr)->idx_scale)
#define FD_OP_SCALE(instr,idx) ((instr)->operands[idx].misc >> 6)
/** Gets the sign-extended displacement of a memory operand.
* Only valid if FD_OP_TYPE == FD_OT_MEM **/
#define FD_OP_DISP(instr,idx) ((instr)->disp)
#define FD_OP_DISP(instr,idx) ((int64_t) (instr)->disp)
/** Gets the (sign-extended) encoded constant for an immediate operand.
* Only valid if FD_OP_TYPE == FD_OT_IMM **/
#define FD_OP_IMM(instr,idx) ((instr)->imm)