Mesa (master): gallivm: Fix lp_build_exp2 order 4-5 polynomial coefficients and bump order.
Jose Fonseca
jrfonseca at kemper.freedesktop.org
Sat Jul 23 01:52:32 UTC 2011
Module: Mesa
Branch: master
Commit: af82ff556cdd748f9f6b0d60d53afaaf369b1c5b
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=af82ff556cdd748f9f6b0d60d53afaaf369b1c5b
Author: José Fonseca <jfonseca at vmware.com>
Date: Wed Jul 20 14:53:08 2011 -0700
gallivm: Fix lp_build_exp2 order 4-5 polynomial coefficients and bump order.
Not sure how I computed these, but they were wrong (which explains why
bumping the polynomial order before never improved precision).
This allows to pass the EXP test cases of PSPrecision/VSPrecision DCTs.
---
src/gallium/auxiliary/gallivm/lp_bld_arit.c | 24 ++++++++++++------------
1 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
index fce4685..0c075ba 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -61,7 +61,7 @@
#include "lp_bld_arit.h"
-#define EXP_POLY_DEGREE 3
+#define EXP_POLY_DEGREE 5
#define LOG_POLY_DEGREE 5
@@ -2218,18 +2218,18 @@ lp_build_polynomial(struct lp_build_context *bld,
*/
const double lp_build_exp2_polynomial[] = {
#if EXP_POLY_DEGREE == 5
- 0.999999999690134838155,
- 0.583974334321735217258,
- 0.164553105719676828492,
- 0.0292811063701710962255,
- 0.00354944426657875141846,
- 0.000296253726543423377365
+ 0.999999925063526176901,
+ 0.693153073200168932794,
+ 0.240153617044375388211,
+ 0.0558263180532956664775,
+ 0.00898934009049466391101,
+ 0.00187757667519147912699
#elif EXP_POLY_DEGREE == 4
- 1.00000001502262084505,
- 0.563586057338685991394,
- 0.150436017652442413623,
- 0.0243220604213317927308,
- 0.0025359088446580436489
+ 1.00000259337069434683,
+ 0.693003834469974940458,
+ 0.24144275689150793076,
+ 0.0520114606103070150235,
+ 0.0135341679161270268764
#elif EXP_POLY_DEGREE == 3
0.999925218562710312959,
0.695833540494823811697,
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