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Added 32-bit sample support to dmix plugin

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This commit is contained in:
Jaroslav Kysela 2003-03-18 14:15:19 +00:00
parent 56dbac84f8
commit 9ccf002f54
3 changed files with 315 additions and 62 deletions
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135
src/pcm/pcm_dmix_i386.h
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@ -114,8 +114,7 @@ static void MIX_AREAS1(unsigned int size,
"\t.p2align 4,,15\n"
"4:"
"\tmovw $0x7fff, %%ax\n"
"\tmovw %%ax, (%%edi)\n"
"\tmovw $0x7fff, (%%edi)\n"
"\tcmpl %%ecx,(%%ebx)\n"
"\tjnz 3b\n"
"\tadd %4, %%edi\n"
@ -132,8 +131,7 @@ static void MIX_AREAS1(unsigned int size,
"\t.p2align 4,,15\n"
"5:"
"\tmovw $-0x8000, %%ax\n"
"\tmovw %%ax, (%%edi)\n"
"\tmovw $-0x8000, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 3b\n"
"\tadd %4, %%edi\n"
@ -240,3 +238,132 @@ static void MIX_AREAS1_MMX(unsigned int size,
: "esi", "edi", "edx", "ecx", "ebx", "eax"
);
}
/*
* for plain i386, 32-bit version (24-bit resolution)
*/
static void MIX_AREAS2(unsigned int size,
volatile signed int *dst, signed int *src,
volatile signed int *sum, unsigned int dst_step,
unsigned int src_step, unsigned int sum_step)
{
/*
* ESI - src
* EDI - dst
* EBX - sum
* ECX - old sample
* EAX - sample / temporary
* EDX - temporary
*/
__asm__ __volatile__ (
"\n"
/*
* initialization, load ESI, EDI, EBX registers
*/
"\tmovl %1, %%edi\n"
"\tmovl %2, %%esi\n"
"\tmovl %3, %%ebx\n"
/*
* while (size-- > 0) {
*/
"\tcmp $0, %0\n"
"jz 6f\n"
"\t.p2align 4,,15\n"
"1:"
/*
* sample = *src;
* sum_sample = *sum;
* if (cmpxchg(*dst, 0, 1) == 0)
* sample -= sum_sample;
* xadd(*sum, sample);
*/
"\tmovl $0, %%eax\n"
"\tmovl $1, %%ecx\n"
"\tmovl (%%ebx), %%edx\n"
"\t" LOCK_PREFIX "cmpxchgl %%ecx, (%%edi)\n"
"\tjnz 2f\n"
"\tmovl (%%esi), %%ecx\n"
"\tshr $8, %%ecx\n"
"\tsubl %%edx, %%ecx\n"
"2:"
"\tmovl (%%esi), %%ecx\n"
"\tshr $8, %%ecx\n"
"\t" LOCK_PREFIX "addl %%ecx, (%%ebx)\n"
/*
* do {
* sample = old_sample = *sum;
* saturate(v);
* *dst = sample;
* } while (v != *sum);
*/
"3:"
"\tmovl (%%ebx), %%ecx\n"
"\tcmpl $0x7fffff,%%ecx\n"
"\tjg 4f\n"
"\tcmpl $-0x800000,%%ecx\n"
"\tjl 5f\n"
"\tmov %%ecx, %%eax\n"
"\tshl $8, %%eax\n"
"\tmovl %%eax, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 3b\n"
/*
* while (size-- > 0)
*/
"\tadd %4, %%edi\n"
"\tadd %5, %%esi\n"
"\tadd %6, %%ebx\n"
"\tdecl %0\n"
"\tjnz 1b\n"
"\tjmp 6f\n"
/*
* sample > 0x7fff00
*/
"\t.p2align 4,,15\n"
"4:"
"\tmovl $0x7fffffff, (%%edi)\n"
"\tcmpl %%ecx,(%%ebx)\n"
"\tjnz 3b\n"
"\tadd %4, %%edi\n"
"\tadd %5, %%esi\n"
"\tadd %6, %%ebx\n"
"\tdecl %0\n"
"\tjnz 1b\n"
"\tjmp 6f\n"
/*
* sample < -0x800000
*/
"\t.p2align 4,,15\n"
"5:"
"\tmovl $-0x80000000, (%%edi)\n"
"\tcmpl %%ecx, (%%ebx)\n"
"\tjnz 3b\n"
"\tadd %4, %%edi\n"
"\tadd %5, %%esi\n"
"\tadd %6, %%ebx\n"
"\tdecl %0\n"
"\tjnz 1b\n"
// "\tjmp 6f\n"
"6:"
: /* no output regs */
: "m" (size), "m" (dst), "m" (src), "m" (sum), "m" (dst_step), "m" (src_step), "m" (sum_step)
: "esi", "edi", "edx", "ecx", "ebx", "eax"
);
}