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gallium: ppc: implement TGSI_OPCODE_LOG/EXP

This commit is contained in:
Brian Paul 2008-10-28 18:57:54 -06:00
parent a045b92511
commit 5db0372b3c
1 changed files with 110 additions and 1 deletions
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111
src/gallium/auxiliary/tgsi/tgsi_ppc.c
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@ -896,6 +896,110 @@ emit_lit(struct gen_context *gen, struct tgsi_full_instruction *inst)
}
static void
emit_exp(struct gen_context *gen, struct tgsi_full_instruction *inst)
{
const int one_vec = gen_one_vec(gen);
int src_vec;
/* get src arg */
src_vec = get_src_vec(gen, inst, 0, CHAN_X);
/* Compute X = 2^floor(src) */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_X)) {
int dst_vec = get_dst_vec(gen, inst, CHAN_X);
int tmp_vec = ppc_allocate_vec_register(gen->f);
ppc_vrfim(gen->f, tmp_vec, src_vec); /* tmp = floor(src); */
ppc_vexptefp(gen->f, dst_vec, tmp_vec); /* dst = 2 ^ tmp */
emit_store(gen, dst_vec, inst, CHAN_X, TRUE);
ppc_release_vec_register(gen->f, tmp_vec);
}
/* Compute Y = src - floor(src) */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Y)) {
int dst_vec = get_dst_vec(gen, inst, CHAN_Y);
int tmp_vec = ppc_allocate_vec_register(gen->f);
ppc_vrfim(gen->f, tmp_vec, src_vec); /* tmp = floor(src); */
ppc_vsubfp(gen->f, dst_vec, src_vec, tmp_vec); /* dst = src - tmp */
emit_store(gen, dst_vec, inst, CHAN_Y, TRUE);
ppc_release_vec_register(gen->f, tmp_vec);
}
/* Compute Z = RoughApprox2ToX(src) */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Z)) {
int dst_vec = get_dst_vec(gen, inst, CHAN_Z);
ppc_vexptefp(gen->f, dst_vec, src_vec); /* dst = 2 ^ src */
emit_store(gen, dst_vec, inst, CHAN_Z, TRUE);
}
/* Compute W = 1.0 */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_W)) {
emit_store(gen, one_vec, inst, CHAN_W, FALSE);
}
release_src_vecs(gen);
}
static void
emit_log(struct gen_context *gen, struct tgsi_full_instruction *inst)
{
const int bit31_vec = gen_get_bit31_vec(gen);
const int one_vec = gen_one_vec(gen);
int src_vec, abs_vec;
/* get src arg */
src_vec = get_src_vec(gen, inst, 0, CHAN_X);
/* compute abs(src) */
abs_vec = ppc_allocate_vec_register(gen->f);
ppc_vandc(gen->f, abs_vec, src_vec, bit31_vec); /* abs = src & ~bit31 */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_X) &&
IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Y)) {
/* compute tmp = floor(log2(abs)) */
int tmp_vec = ppc_allocate_vec_register(gen->f);
ppc_vlogefp(gen->f, tmp_vec, abs_vec); /* tmp = log2(abs) */
ppc_vrfim(gen->f, tmp_vec, tmp_vec); /* tmp = floor(tmp); */
/* Compute X = tmp */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_X)) {
emit_store(gen, tmp_vec, inst, CHAN_X, FALSE);
}
/* Compute Y = abs / 2^tmp */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Y)) {
const int zero_vec = ppc_allocate_vec_register(gen->f);
ppc_vzero(gen->f, zero_vec);
ppc_vexptefp(gen->f, tmp_vec, tmp_vec); /* tmp = 2 ^ tmp */
ppc_vrefp(gen->f, tmp_vec, tmp_vec); /* tmp = 1 / tmp */
/* tmp = abs * tmp + zero */
ppc_vmaddfp(gen->f, tmp_vec, abs_vec, tmp_vec, zero_vec);
emit_store(gen, tmp_vec, inst, CHAN_Y, FALSE);
ppc_release_vec_register(gen->f, zero_vec);
}
ppc_release_vec_register(gen->f, tmp_vec);
}
/* Compute Z = RoughApproxLog2(abs) */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_Z)) {
int dst_vec = get_dst_vec(gen, inst, CHAN_Z);
ppc_vlogefp(gen->f, dst_vec, abs_vec); /* dst = log2(abs) */
emit_store(gen, dst_vec, inst, CHAN_Z, TRUE);
}
/* Compute W = 1.0 */
if (IS_DST0_CHANNEL_ENABLED(*inst, CHAN_W)) {
emit_store(gen, one_vec, inst, CHAN_W, FALSE);
}
ppc_release_vec_register(gen->f, abs_vec);
release_src_vecs(gen);
}
static int
emit_instruction(struct gen_context *gen,
struct tgsi_full_instruction *inst)
@ -940,6 +1044,12 @@ emit_instruction(struct gen_context *gen,
case TGSI_OPCODE_LIT:
emit_lit(gen, inst);
break;
case TGSI_OPCODE_LOG:
emit_log(gen, inst);
break;
case TGSI_OPCODE_EXP:
emit_exp(gen, inst);
break;
case TGSI_OPCODE_END:
/* normal end */
return 1;
@ -1098,7 +1208,6 @@ tgsi_emit_ppc(const struct tgsi_token *tokens,
/* splat each immediate component into a float[4] vector for SoA */
{
const uint size = parse.FullToken.FullImmediate.Immediate.Size - 1;
float *imm = (float *) immediates;
uint i;
assert(size <= 4);
assert(num_immediates < TGSI_EXEC_NUM_IMMEDIATES);