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| author | Richard Sandiford <richard.sandiford@arm.com> | 2015-10-07 08:09:45 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2015-10-07 08:09:45 +0000 |
| commit | d01db77a06a80459acf79e963c55e3b94106eeb3 (patch) | |
| tree | 26df13af657839b7995fa4de21f93310ada1c766 /gcc/real.h | |
| 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.h')
| -rw-r--r-- | gcc/real.h | 16 |
1 files changed, 11 insertions, 5 deletions
@@ -409,15 +409,21 @@ extern REAL_VALUE_TYPE dconst2; extern REAL_VALUE_TYPE dconstm1; extern REAL_VALUE_TYPE dconsthalf; -#define dconst_e() (*dconst_e_ptr ()) -#define dconst_third() (*dconst_third_ptr ()) -#define dconst_sqrt2() (*dconst_sqrt2_ptr ()) +#define dconst_e() (*dconst_e_ptr ()) +#define dconst_third() (*dconst_third_ptr ()) +#define dconst_quarter() (*dconst_quarter_ptr ()) +#define dconst_sixth() (*dconst_sixth_ptr ()) +#define dconst_ninth() (*dconst_ninth_ptr ()) +#define dconst_sqrt2() (*dconst_sqrt2_ptr ()) /* Function to return the real value special constant 'e'. */ extern const REAL_VALUE_TYPE * dconst_e_ptr (void); -/* Returns the special REAL_VALUE_TYPE corresponding to 1/3. */ -extern const REAL_VALUE_TYPE * dconst_third_ptr (void); +/* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n. */ +extern const REAL_VALUE_TYPE *dconst_third_ptr (void); +extern const REAL_VALUE_TYPE *dconst_quarter_ptr (void); +extern const REAL_VALUE_TYPE *dconst_sixth_ptr (void); +extern const REAL_VALUE_TYPE *dconst_ninth_ptr (void); /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */ extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void); |