fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-04 20:38:06 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

gallium: PPC LIT instruction (not quite complete yet)

Browse source
This commit is contained in:
Brian Paul 2008-10-22 16:57:22 -06:00
parent 77160cd97b
commit 9e3ee82305
1 changed files with 85 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

89
src/gallium/auxiliary/tgsi/tgsi_ppc.c
View file

@ -535,12 +535,95 @@ emit_triop(struct gen_context *gen, struct tgsi_full_instruction *inst)
}
/*
/** Approximation for vr = pow(va, vb) */
static void
ppc_vec_pow(struct ppc_function *f, int vr, int va, int vb)
{
/* pow(a,b) ~= exp2(log2(a) * b) */
int t_vec = ppc_allocate_vec_register(f);
int zero_vec = ppc_allocate_vec_register(f);
ppc_vload_float(f, zero_vec, 0.0f);
ppc_vlogefp(f, t_vec, va); /* t = log2(va) */
ppc_vmaddfp(f, t_vec, t_vec, vb, zero_vec); /* t = t * vb */
ppc_vexptefp(f, vr, t_vec); /* vr = 2^t */
ppc_release_vec_register(f, t_vec);
ppc_release_vec_register(f, zero_vec);
}
static void
emit_lit(struct gen_context *gen, struct tgsi_full_instruction *inst)
{
int one_vec = gen_one_vec(gen);
/* Compute X */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_X)) {
STORE(gen, *inst, one_vec, 0, CHAN_X);
}
/* Compute Y, Z */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Y) ||
IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Z)) {
int x_vec = ppc_allocate_vec_register(gen->f);
int zero_vec = ppc_allocate_vec_register(gen->f);
FETCH(gen, *inst, x_vec, 0, CHAN_X); /* x_vec = src[0].x */
ppc_vload_float(gen->f, zero_vec, 0.0f); /* zero = {0,0,0,0} */
ppc_vmaxfp(gen->f, x_vec, x_vec, zero_vec); /* x_vec = max(x_vec, 0) */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Y)) {
STORE(gen, *inst, x_vec, 0, CHAN_Y); /* store Y */
}
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Z)) {
int y_vec = ppc_allocate_vec_register(gen->f);
int z_vec = ppc_allocate_vec_register(gen->f);
int w_vec = ppc_allocate_vec_register(gen->f);
int pow_vec = ppc_allocate_vec_register(gen->f);
int pos_vec = ppc_allocate_vec_register(gen->f);
int c128_vec = ppc_allocate_vec_register(gen->f);
FETCH(gen, *inst, y_vec, 0, CHAN_Y); /* y_vec = src[0].y */
ppc_vmaxfp(gen->f, y_vec, y_vec, zero_vec); /* y_vec = max(y_vec, 0) */
FETCH(gen, *inst, w_vec, 0, CHAN_W); /* w_vec = src[0].w */
/* XXX clamp Y to [-128, 128] */
ppc_vload_float(gen->f, c128_vec, 128.0f);
/* if temp.x > 0
* pow(tmp.y, tmp.w)
* else
* 0.0
*/
ppc_vec_pow(gen->f, pow_vec, y_vec, w_vec); /* pow = pow(y, w) */
ppc_vcmpgtfpx(gen->f, pos_vec, x_vec, zero_vec); /* pos = x > 0 */
ppc_vand(gen->f, z_vec, pow_vec, pos_vec); /* z = pow & pos */
STORE(gen, *inst, z_vec, 0, CHAN_Z); /* store Z */
ppc_release_vec_register(gen->f, y_vec);
ppc_release_vec_register(gen->f, z_vec);
ppc_release_vec_register(gen->f, w_vec);
ppc_release_vec_register(gen->f, pow_vec);
ppc_release_vec_register(gen->f, pos_vec);
}
ppc_release_vec_register(gen->f, x_vec);
ppc_release_vec_register(gen->f, zero_vec);
}
/* Compute W */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_W)) {
STORE(gen, *inst, one_vec, 0, CHAN_W);
}
}
*/
static int
@ -584,11 +667,9 @@ emit_instruction(struct gen_context *gen,
case TGSI_OPCODE_DPH:
emit_dotprod(gen, inst);
break;
/*
case TGSI_OPCODE_LIT:
emit_lit(gen, inst);
break;
*/
case TGSI_OPCODE_END:
/* normal end */
return 1;