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Add IA-32 assembly for ESFM feedback calculation

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Natt Akuma 2024-02-02 16:31:42 +07:00
parent 56b489c095
commit 603f220d14
1 changed files with 66 additions and 2 deletions
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68
extern/ESFMu/esfm.c vendored
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@ -1744,7 +1744,6 @@ ESFM_process_feedback(esfm_chip *chip)
{
int channel_idx;
// TODO: the tight 29-iteration loop can be vectorized across channels
for (channel_idx = 0; channel_idx < 18; channel_idx++)
{
esfm_slot *slot = &chip->channels[channel_idx].slots[0];
@ -1753,7 +1752,6 @@ ESFM_process_feedback(esfm_chip *chip)
uint10 f_num;
int32_t wave_out, wave_last;
int32_t phase_feedback;
uint19 regressed_phase;
uint32_t iter_counter;
uint3 waveform;
uint3 mod_in_shift;
@ -1844,6 +1842,72 @@ ESFM_process_feedback(esfm_chip *chip)
[exprom] "m" (exprom)
: "cc", "ax", "bx", "cx", "dx", "r8", "r9", "r10", "r11"
);
#elif defined(__GNUC__) && defined(__i386__)
asm (
"movzbl %b[wave], %%eax \n\t"
"shll $11, %%eax \n\t"
"leal %[sinrom], %%edi \n\t"
"addl %%eax, %%edi \n\t"
"shlw $3, %[eg_out] \n\t"
"xorl %[out], %[out] \n\t"
"movl %[out], %[last] \n\t"
"movl $29, %[i] \n"
"1: \n\t"
// phase_feedback = (wave_out + wave_last) >> 2;
"movl %[out], %%eax \n\t"
"addl %[last], %%eax \n\t"
"sarl $2, %%eax \n\t"
"movl %%eax, %[p_fb] \n\t"
// wave_last = wave_out
"movl %[out], %[last] \n\t"
// phase = phase_feedback >> mod_in_shift;
"movb %[mod_in], %%cl \n\t"
"sarl %%cl, %%eax \n\t"
// phase += phase_acc >> 9;
"movl %[p_acc], %%ebx \n\t"
"shrl $9, %%ebx \n\t"
"addl %%ebx, %%eax \n\t"
// lookup = logsinrom[(waveform << 10) | (phase & 0x3ff)];
"andl $0x3ff, %%eax \n\t"
"movzwl (%%edi, %%eax, 2), %%ebx \n\t"
"movl %%ebx, %%eax \n\t"
// level = (lookup & 0x1fff) + (envelope << 3);
"movl $0x1fff, %%ecx \n\t"
"andl %%ecx, %%eax \n\t"
"addw %[eg_out], %%ax \n\t"
// if (level > 0x1fff) level = 0x1fff;
"cmpl %%ecx, %%eax \n\t"
"cmoval %%ecx, %%eax \n\t"
// wave_out = exprom[level & 0xff] >> (level >> 8);
"movb %%ah, %%cl \n\t"
"movzbl %%al, %%eax \n\t"
"leal %[exprom], %[out] \n\t"
"movzwl (%[out], %%eax, 2), %[out] \n\t"
"shrl %%cl, %[out] \n\t"
// if (lookup & 0x8000) wave_out = -wave_out;
// in other words, lookup is negative
"movl %[out], %%ecx \n\t"
"negl %%ecx \n\t"
"testw %%bx, %%bx \n\t"
"cmovsl %%ecx, %[out] \n\t"
// phase_acc += phase_offset
"addl %[p_off], %[p_acc] \n\t"
// loop
"decl %[i] \n\t"
"jne 1b \n\t"
: [p_fb] "=&m" (phase_feedback),
[p_acc] "+r" (phase_acc),
[out] "=&r" (wave_out),
[last] "=&m" (wave_last),
[eg_out] "+m" (eg_output)
: [p_off] "m" (phase_offset),
[mod_in] "m" (mod_in_shift),
[wave] "m" (waveform),
[sinrom] "m" (logsinrom),
[exprom] "m" (exprom),
[i] "m" (iter_counter)
: "cc", "ax", "bx", "cx", "di"
);
#else
wave_out = 0;
wave_last = 0;