mirror of https://github.com/snes9xgit/snes9x.git
164 lines
3.0 KiB
Brainfuck
164 lines
3.0 KiB
Brainfuck
nop(0x00) {
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1:op_io();
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}
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sleep(0xef),
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stop(0xff) {
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1:op_io();
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2:op_io();
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regs.pc--;
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}
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xcn(0x9f) {
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1:op_io();
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2:op_io();
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3:op_io();
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4:op_io();
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regs.a = (regs.a >> 4) | (regs.a << 4);
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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daa(0xdf) {
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1:op_io();
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2:op_io();
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if(regs.p.c || (regs.a) > 0x99) {
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regs.a += 0x60;
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regs.p.c = 1;
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}
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if(regs.p.h || (regs.a & 15) > 0x09) {
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regs.a += 0x06;
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}
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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das(0xbe) {
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1:op_io();
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2:op_io();
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if(!regs.p.c || (regs.a) > 0x99) {
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regs.a -= 0x60;
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regs.p.c = 0;
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}
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if(!regs.p.h || (regs.a & 15) > 0x09) {
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regs.a -= 0x06;
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}
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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clrc(0x60, regs.p.c = 0),
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clrp(0x20, regs.p.p = 0),
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setc(0x80, regs.p.c = 1),
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setp(0x40, regs.p.p = 1) {
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1:op_io();
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$1;
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}
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clrv(0xe0) {
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1:op_io();
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regs.p.v = 0;
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regs.p.h = 0;
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}
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notc(0xed) {
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1:op_io();
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2:op_io();
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regs.p.c = !regs.p.c;
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}
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ei(0xa0, 1),
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di(0xc0, 0) {
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1:op_io();
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2:op_io();
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regs.p.i = $1;
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}
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set0_dp(0x02, rd |= 0x01),
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clr0_dp(0x12, rd &= ~0x01),
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set1_dp(0x22, rd |= 0x02),
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clr1_dp(0x32, rd &= ~0x02),
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set2_dp(0x42, rd |= 0x04),
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clr2_dp(0x52, rd &= ~0x04),
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set3_dp(0x62, rd |= 0x08),
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clr3_dp(0x72, rd &= ~0x08),
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set4_dp(0x82, rd |= 0x10),
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clr4_dp(0x92, rd &= ~0x10),
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set5_dp(0xa2, rd |= 0x20),
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clr5_dp(0xb2, rd &= ~0x20),
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set6_dp(0xc2, rd |= 0x40),
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clr6_dp(0xd2, rd &= ~0x40),
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set7_dp(0xe2, rd |= 0x80),
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clr7_dp(0xf2, rd &= ~0x80) {
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1:dp = op_readpc();
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2:rd = op_readdp(dp);
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3:$1;
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op_writedp(dp, rd);
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}
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push_a(0x2d, a),
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push_x(0x4d, x),
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push_y(0x6d, y),
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push_p(0x0d, p) {
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1:op_io();
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2:op_io();
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3:op_writestack(regs.$1);
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}
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pop_a(0xae, a),
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pop_x(0xce, x),
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pop_y(0xee, y),
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pop_p(0x8e, p) {
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1:op_io();
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2:op_io();
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3:regs.$1 = op_readstack();
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}
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mul_ya(0xcf) {
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1:op_io();
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2:op_io();
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3:op_io();
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4:op_io();
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5:op_io();
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6:op_io();
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7:op_io();
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8:op_io();
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ya = regs.y * regs.a;
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regs.a = ya;
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regs.y = ya >> 8;
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//result is set based on y (high-byte) only
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regs.p.n = !!(regs.y & 0x80);
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regs.p.z = (regs.y == 0);
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}
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div_ya_x(0x9e) {
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1:op_io();
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2:op_io();
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3:op_io();
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4:op_io();
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5:op_io();
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6:op_io();
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7:op_io();
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8:op_io();
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9:op_io();
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10:op_io();
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11:op_io();
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ya = regs.ya;
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//overflow set if quotient >= 256
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regs.p.v = !!(regs.y >= regs.x);
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regs.p.h = !!((regs.y & 15) >= (regs.x & 15));
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if(regs.y < (regs.x << 1)) {
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//if quotient is <= 511 (will fit into 9-bit result)
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regs.a = ya / regs.x;
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regs.y = ya % regs.x;
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} else {
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//otherwise, the quotient won't fit into regs.p.v + regs.a
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//this emulates the odd behavior of the S-SMP in this case
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regs.a = 255 - (ya - (regs.x << 9)) / (256 - regs.x);
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regs.y = regs.x + (ya - (regs.x << 9)) % (256 - regs.x);
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}
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//result is set based on a (quotient) only
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regs.p.n = !!(regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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