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math: Improve layout of exp/exp10 data

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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)
(cherry picked from commit 5a08d049dc5037e89eb95bb1506652f0043fa39e)
This commit is contained in:
Wilco Dijkstra 2024-12-13 15:43:07 +00:00
parent 20b5d5ce26
commit d2febe7c40
1 changed files with 2 additions and 1 deletions

3
sysdeps/ieee754/dbl-64/math_config.h

@ -134,10 +134,11 @@ 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)];