diff options
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_ppc.c')
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_ppc.c | 89 |
1 files changed, 85 insertions, 4 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ppc.c b/src/gallium/auxiliary/tgsi/tgsi_ppc.c index c1e707657b5..edd535a8846 100644 --- a/src/gallium/auxiliary/tgsi/tgsi_ppc.c +++ b/src/gallium/auxiliary/tgsi/tgsi_ppc.c @@ -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; |