math: Improve layout of expf data

GCC aligns global data to 16 bytes if their size is >= 16 bytes.  This patch
changes the exp2f_data struct slightly so that the fields are better aligned.
As a result on targets that support them, load-pair instructions accessing
poly_scaled and invln2_scaled are now 16-byte aligned.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
(cherry picked from commit 44fa9c1080fe6a9539f0d2345b9d2ae37b8ee57a)

diff --git a/sysdeps/ieee754/flt-32/math_config.h b/sysdeps/ieee754/flt-32/math_config.h
index c7f71ca496228c2d1d8a07b4e81f7113abc85f52..6a52d1d51b478a2bf46a2d55e9ec7fdc66369ef7 100644 (file)
--- a/sysdeps/ieee754/flt-32/math_config.h
+++ b/sysdeps/ieee754/flt-32/math_config.h
@@ -126,9 +126,9 @@ extern const struct exp2f_data
   uint64_t tab[1 << EXP2F_TABLE_BITS];
   double shift_scaled;
   double poly[EXP2F_POLY_ORDER];
-  double shift;
   double invln2_scaled;
   double poly_scaled[EXP2F_POLY_ORDER];
+  double shift;
 } __exp2f_data attribute_hidden;
 
 #define LOGF_TABLE_BITS 4