Eliminate redundant sign extensions in pow()

When looking at the code generated for pow() on ppc64 I noticed quite
a few sign extensions. Making the array indices unsigned reduces the
number of sign extensions from 24 to 7.

Tested for powerpc64le and x86_64.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index bea73e3582..de8a1bcb65 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-01-04  Anton Blanchard  <anton@samba.org>
+
+	* sysdeps/ieee754/dbl-64/e_pow.c (log1): Use unsigned int
+	for array indices.
+	* sysdeps/ieee754/dbl-64/e_pow.c (my_log2): Likewise.
+
 2016-01-04  Joseph Myers  <joseph@codesourcery.com>
 
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