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-rw-r--r--src/gallium/auxiliary/tgsi/tgsi_ppc.c89
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 c1e707657b..edd535a884 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;