40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
|
From 5a08d049dc5037e89eb95bb1506652f0043fa39e Mon Sep 17 00:00:00 2001
|
||
|
|
From: Wilco Dijkstra <wilco.dijkstra@arm.com>
|
||
|
|
Date: Fri, 13 Dec 2024 15:43:07 +0000
|
||
|
|
Subject: [PATCH] math: Improve layout of exp/exp10 data
|
||
|
|
|
||
|
|
GCC aligns global data to 16 bytes if their size is >= 16 bytes. This patch
|
||
|
|
changes the exp_data struct slightly so that the fields are better aligned
|
||
|
|
and without gaps. As a result on targets that support them, more load-pair
|
||
|
|
instructions are used in exp.
|
||
|
|
|
||
|
|
The exp benchmark improves 2.5%, "144bits" by 7.2%, "768bits" by 12.7% on
|
||
|
|
Neoverse V2.
|
||
|
|
|
||
|
|
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
|
||
|
|
(cherry picked from commit 5afaf99edb326fd9f36eb306a828d129a3a1d7f7)
|
||
|
|
---
|
||
|
|
sysdeps/ieee754/dbl-64/math_config.h | 3 ++-
|
||
|
|
1 file changed, 2 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/sysdeps/ieee754/dbl-64/math_config.h b/sysdeps/ieee754/dbl-64/math_config.h
|
||
|
|
index 19af33fd86..52b720ecd1 100644
|
||
|
|
--- a/sysdeps/ieee754/dbl-64/math_config.h
|
||
|
|
+++ b/sysdeps/ieee754/dbl-64/math_config.h
|
||
|
|
@@ -195,10 +195,11 @@ check_uflow (double x)
|
||
|
|
extern const struct exp_data
|
||
|
|
{
|
||
|
|
double invln2N;
|
||
|
|
- double shift;
|
||
|
|
double negln2hiN;
|
||
|
|
double negln2loN;
|
||
|
|
double poly[4]; /* Last four coefficients. */
|
||
|
|
+ double shift;
|
||
|
|
+
|
||
|
|
double exp2_shift;
|
||
|
|
double exp2_poly[EXP2_POLY_ORDER];
|
||
|
|
uint64_t tab[2*(1 << EXP_TABLE_BITS)];
|
||
|
|
--
|
||
|
|
2.27.0
|
||
|
|
|