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simplifcation of encoding table, properly define compositionaly various encoding definitions.

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ed
2026-09-09 14:03:30 -04:00
parent 588fa20778
commit 95e67a8c1a
6 changed files with 397 additions and 827 deletions
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code/8086/decoder_table_generator.meta.c
+11 -1
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@@ -97,6 +97,13 @@ x8616_decode_gen_plan(X8616_Encoding_R encoding, U4 encoding_idx, X8616_InfoList
if (encoding->fields.z.width) { plan.flags |= x8616_plan_has_z; plan.z_shift = encoding->fields.z.shift; }
if (encoding->fields.reg.width) { plan.flags |= x8616_plan_has_reg; plan.reg_shift = encoding->fields.reg.shift; }
if (encoding->fields.sr.width) { plan.flags |= x8616_plan_has_sr; plan.sr_shift = encoding->fields.sr.shift; }
if (encoding->fields.alu.width) {
plan.flags |= x8616_plan_has_alu;
plan.alu_shift = encoding->fields.alu.shift;
if ((plan.flags & x8616_plan_has_modrm) && encoding->fields.d.width == 0)
plan.flags |= x8616_plan_alu_modrm;
}
if (encoding->fields.cc.width) { plan.flags |= x8616_plan_has_cc; plan.cc_shift = encoding->fields.cc.shift; }
if (x8616_decode_gen_operand_uses_rm(encoding->operands[0]) || x8616_decode_gen_operand_uses_rm(encoding->operands[1]))
plan.flags |= x8616_plan_uses_rm;
@@ -328,7 +335,8 @@ x8616_decode_gen_emit_plan(Str8Gen_R out, X8616_DecodePlan_R plan) { defer_rewin
<payload>, <prefix_kind>,
<d_shift>, <w_shift>, <s_shift>, <v_shift>, <z_shift>, <reg_shift>, <sr_shift>,
{<mod_rm.bits>, <mod_rm.mask>},
{<post_opcode.bits>, <post_opcode.mask>},
{<post_opcode.bits>, <post_opcode.mask>},
<alu_shift>, <cc_shift>,
},\n
);
KTL_Slot_Str8 tbl[] = {
@@ -352,6 +360,8 @@ x8616_decode_gen_emit_plan(Str8Gen_R out, X8616_DecodePlan_R plan) { defer_rewin
entry("mod_rm.mask", hex_u1(plan->mod_rm.mask)),
entry("post_opcode.bits", hex_u1(plan->post_opcode.bits)),
entry("post_opcode.mask", hex_u1(plan->post_opcode.mask)),
entry("alu_shift", dec(plan->alu_shift)),
entry("cc_shift", dec(plan->cc_shift)),
};
str8gen_append_fmt(out, template, ktl_str8_from_arr(tbl));
}}