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authorBrian Paul <brian.paul@tungstengraphics.com>2008-10-22 17:29:37 -0600
committerBrian Paul <brian.paul@tungstengraphics.com>2008-10-22 17:29:37 -0600
commit0ac99457811eb766e9bdd3903857b5c0fdef7694 (patch)
tree7350f062187160d506632e3ca05e8f1c675754ed
parentf8ab4feb75f4a592e23859813c093dcdbd4b8988 (diff)
gallium: PPC: clamp y to [-128,128] for LIT
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi_ppc.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ppc.c b/src/gallium/auxiliary/tgsi/tgsi_ppc.c
index 96beec0cc6..9ad7ecd7cf 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ppc.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ppc.c
@@ -636,16 +636,17 @@ emit_lit(struct gen_context *gen, struct tgsi_full_instruction *inst)
FETCH(gen, *inst, w_vec, 0, CHAN_W); /* w_vec = src[0].w */
- /* XXX clamp Y to [-128, 128] */
+ /* clamp Y to [-128, 128] */
load_constant_vec(gen, p128_vec, 128.0f);
load_constant_vec(gen, n128_vec, -128.0f);
+ ppc_vmaxfp(gen->f, y_vec, y_vec, n128_vec); /* y = max(y, -128) */
+ ppc_vminfp(gen->f, y_vec, y_vec, p128_vec); /* y = min(y, 128) */
/* if temp.x > 0
- * pow(tmp.y, tmp.w)
+ * z = pow(tmp.y, tmp.w)
* else
- * 0.0
+ * z = 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 */