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Generate custom code for getzf/getcf/test_be

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This commit is contained in:
Fabian 2020-12-31 19:14:28 -06:00
parent af5d01fff6
commit 970739f60b
1 changed files with 121 additions and 3 deletions
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124
src/rust/codegen.rs
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@ -1,5 +1,7 @@
use cpu::BitSize;
use cpu2::cpu::{TLB_GLOBAL, TLB_HAS_CODE, TLB_NO_USER, TLB_READONLY, TLB_VALID};
use cpu2::cpu::{
FLAG_CARRY, FLAG_ZERO, TLB_GLOBAL, TLB_HAS_CODE, TLB_NO_USER, TLB_READONLY, TLB_VALID,
};
use global_pointers;
use jit::JitContext;
use modrm;
@ -1388,6 +1390,99 @@ pub fn gen_clear_flags_bits(builder: &mut WasmBuilder, bits_to_clear: i32) {
builder.instruction_body.and_i32();
builder.instruction_body.store_aligned_i32(0);
}
pub fn gen_getzf(builder: &mut WasmBuilder) {
builder
.instruction_body
.load_aligned_i32(global_pointers::FLAGS_CHANGED);
builder.instruction_body.const_i32(FLAG_ZERO);
builder.instruction_body.and_i32();
builder.instruction_body.if_i32();
builder
.instruction_body
.load_aligned_i32(global_pointers::LAST_RESULT);
let last_result = builder.tee_new_local();
builder.instruction_body.const_i32(-1);
builder.instruction_body.xor_i32();
builder.instruction_body.get_local(&last_result);
builder.free_local(last_result);
builder.instruction_body.const_i32(1);
builder.instruction_body.sub_i32();
builder.instruction_body.and_i32();
builder
.instruction_body
.load_aligned_i32(global_pointers::LAST_OP_SIZE);
builder.instruction_body.shr_u_i32();
builder.instruction_body.const_i32(1);
builder.instruction_body.and_i32();
builder.instruction_body.else_();
builder
.instruction_body
.load_aligned_i32(global_pointers::FLAGS);
builder.instruction_body.const_i32(FLAG_ZERO);
builder.instruction_body.and_i32();
builder.instruction_body.block_end();
}
pub fn gen_getcf(builder: &mut WasmBuilder) {
builder
.instruction_body
.load_aligned_i32(global_pointers::FLAGS_CHANGED);
builder.instruction_body.const_i32(FLAG_CARRY);
builder.instruction_body.and_i32();
builder.instruction_body.if_i32();
builder
.instruction_body
.load_aligned_i32(global_pointers::LAST_OP1);
let last_op1 = builder.tee_new_local();
builder
.instruction_body
.load_aligned_i32(global_pointers::LAST_OP2);
let last_op2 = builder.tee_new_local();
builder.instruction_body.xor_i32();
builder.instruction_body.get_local(&last_op2);
builder
.instruction_body
.load_aligned_i32(global_pointers::LAST_ADD_RESULT);
builder.instruction_body.xor_i32();
builder.instruction_body.and_i32();
builder.instruction_body.get_local(&last_op1);
builder.instruction_body.xor_i32();
builder.free_local(last_op1);
builder.free_local(last_op2);
builder
.instruction_body
.load_aligned_i32(global_pointers::LAST_OP_SIZE);
builder.instruction_body.shr_u_i32();
builder.instruction_body.const_i32(1);
builder.instruction_body.and_i32();
builder.instruction_body.else_();
builder
.instruction_body
.load_aligned_i32(global_pointers::FLAGS);
builder.instruction_body.const_i32(FLAG_CARRY);
builder.instruction_body.and_i32();
builder.instruction_body.block_end();
}
pub fn gen_test_be(builder: &mut WasmBuilder) {
// TODO: Could be made lazy
gen_getcf(builder);
gen_getzf(builder);
builder.instruction_body.or_i32();
}
pub fn gen_fpu_get_sti(ctx: &mut JitContext, i: u32) {
ctx.builder.instruction_body.const_i32(i as i32);
gen_call_fn1_ret_f64(ctx.builder, "fpu_get_sti");
@ -1422,8 +1517,31 @@ pub fn gen_trigger_gp(ctx: &mut JitContext, error_code: u32) {
pub fn gen_condition_fn(builder: &mut WasmBuilder, condition: u8) {
dbg_assert!(condition < 16);
let condition_name = CONDITION_FUNCTIONS[condition as usize];
gen_fn0_const_ret(builder, condition_name);
if condition == 2 {
gen_getcf(builder);
}
else if condition == 3 {
gen_getcf(builder);
builder.instruction_body.eqz_i32();
}
else if condition == 4 {
gen_getzf(builder);
}
else if condition == 5 {
gen_getzf(builder);
builder.instruction_body.eqz_i32();
}
else if condition == 6 {
gen_test_be(builder);
}
else if condition == 7 {
gen_test_be(builder);
builder.instruction_body.eqz_i32();
}
else {
let condition_name = CONDITION_FUNCTIONS[condition as usize];
gen_fn0_const_ret(builder, condition_name);
}
}
pub fn gen_move_registers_from_locals_to_memory(ctx: &mut JitContext) {