From cfcbebf7ac5de5bf1928201b6bd9cd5e6764b4a7 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 23 Sep 2015 22:52:13 +0000 Subject: [PATCH] Don't use volatile in exp2f. sysdeps/ieee754/flt-32/e_exp2f.c declares two variable as "static const volatile float". Maybe this use of "volatile" was originally intended to inhibit optimization of underflowing / overflowing operations such as TWOM100 * TWOM100; in any case, it's not currently needed, as given -frounding-math constant folding of such expressions is properly disabled when it would be unsafe. This patch removes the unnecessary use of "volatile". Tested for x86_64. * sysdeps/ieee754/flt-32/e_exp2f.c (TWOM100): Remove volatile. (TWO127): Likewise. --- ChangeLog | 3 +++ sysdeps/ieee754/flt-32/e_exp2f.c | 4 ++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/ChangeLog b/ChangeLog index 20fd655..019b66f 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,8 @@ 2015-09-23 Joseph Myers + * sysdeps/ieee754/flt-32/e_exp2f.c (TWOM100): Remove volatile. + (TWO127): Likewise. + * sysdeps/generic/math_private.h (fabs_tg): New macro. (min_of_type): Likewise. (math_check_force_underflow): Likewise. diff --git a/sysdeps/ieee754/flt-32/e_exp2f.c b/sysdeps/ieee754/flt-32/e_exp2f.c index d8e7a9c..c053340 100644 --- a/sysdeps/ieee754/flt-32/e_exp2f.c +++ b/sysdeps/ieee754/flt-32/e_exp2f.c @@ -37,8 +37,8 @@ #include "t_exp2f.h" -static const volatile float TWOM100 = 7.88860905e-31; -static const volatile float TWO127 = 1.7014118346e+38; +static const float TWOM100 = 7.88860905e-31; +static const float TWO127 = 1.7014118346e+38; float __ieee754_exp2f (float x) -- 2.7.4