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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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5
decode.c
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@@ -249,8 +249,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, FdInstr* instr,
}
out_o1->type = FD_OT_MEM;
instr->idx_scale = scale;
instr->idx_reg = !vsib && idx == 4 ? FD_REG_NONE : idx;
out_o1->misc = (scale << 6) | (!vsib && idx == 4 ? FD_REG_NONE : idx);
// RIP-relative addressing only if SIB-byte is absent
if (mod == 0 && rm == 5 && mode == DECODE_64)
@@ -521,7 +520,7 @@ fd_decode(const uint8_t* buffer, size_t len_sz, int mode_int, uintptr_t address,
FdOp* operand = &instr->operands[DESC_IMM_IDX(desc)];
operand->type = FD_OT_MEM;
operand->reg = FD_REG_NONE;
instr->idx_reg = FD_REG_NONE;
operand->misc = FD_REG_NONE;
if (UNLIKELY(off + addr_size > len))
return FD_ERR_PARTIAL;