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author | Richard Sandiford <richard.sandiford@arm.com> | 2015-10-07 08:09:45 +0000 |
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committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2015-10-07 08:09:45 +0000 |
commit | d01db77a06a80459acf79e963c55e3b94106eeb3 (patch) | |
tree | 26df13af657839b7995fa4de21f93310ada1c766 /gcc/real.c | |
parent | 5b5dce39b8c076c185ce1fa19d4800d6129f3f53 (diff) | |
download | gcc-d01db77a06a80459acf79e963c55e3b94106eeb3.zip gcc-d01db77a06a80459acf79e963c55e3b94106eeb3.tar.gz gcc-d01db77a06a80459acf79e963c55e3b94106eeb3.tar.bz2 |
Cache reals for 1/4, 1/6 and 1/9
We have a global 1/2 and a cached 1/3, but recalculate 1/4, 1/6 and 1/9
each time we need them. That seems a bit arbitrary and makes the folding
code more noisy (especially once it's moved to match.pd).
This patch caches the other three constants too. Bootstrapped &
regression-tested on x86_64-linux-gnu.
gcc/
* real.h (dconst_quarter, dconst_sixth, dconst_ninth): New macros.
(dconst_quarter_ptr, dconst_sixth_ptr, dconst_ninth_ptr): Declare.
* real.c (CACHED_FRACTION): New helper macro.
(dconst_third_ptr): Use it.
(dconst_quarter_ptr, dconst_sixth_ptr, dconst_ninth_ptr): New.
* builtins.c (fold_builtin_sqrt): Use dconst_quarter and
dconst_sixth.
(fold_builtin_cbrt): Use dconst_sixth and dconst_ninth.
From-SVN: r228561
Diffstat (limited to 'gcc/real.c')
-rw-r--r-- | gcc/real.c | 35 |
1 files changed, 20 insertions, 15 deletions
@@ -2395,21 +2395,26 @@ dconst_e_ptr (void) return &value; } -/* Returns the special REAL_VALUE_TYPE corresponding to 1/3. */ - -const REAL_VALUE_TYPE * -dconst_third_ptr (void) -{ - static REAL_VALUE_TYPE value; - - /* Initialize mathematical constants for constant folding builtins. - These constants need to be given to at least 160 bits precision. */ - if (value.cl == rvc_zero) - { - real_arithmetic (&value, RDIV_EXPR, &dconst1, real_digit (3)); - } - return &value; -} +/* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n. */ + +#define CACHED_FRACTION(NAME, N) \ + const REAL_VALUE_TYPE * \ + NAME (void) \ + { \ + static REAL_VALUE_TYPE value; \ + \ + /* Initialize mathematical constants for constant folding builtins. \ + These constants need to be given to at least 160 bits \ + precision. */ \ + if (value.cl == rvc_zero) \ + real_arithmetic (&value, RDIV_EXPR, &dconst1, real_digit (N)); \ + return &value; \ + } + +CACHED_FRACTION (dconst_third_ptr, 3) +CACHED_FRACTION (dconst_quarter_ptr, 4) +CACHED_FRACTION (dconst_sixth_ptr, 6) +CACHED_FRACTION (dconst_ninth_ptr, 9) /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */ |