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authornaruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-04-30 15:39:02 (GMT)
committernaruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-04-30 15:39:02 (GMT)
commit4cf460a7bb258d3d61414d2f74df4c0f83c6a3af (patch)
treeda5b3754ad1910426086dc4a7f4dd7cca7b65b92 /internal.h
parentc19c8ef4aedadd52b9354188f36aa590ec319200 (diff)
* string.c (search_nonascii): unroll and use ntz
* configure.in (__builtin_ctz): check. * configure.in (__builtin_ctzll): check. * internal.h (rb_popcount32): defined for ntz_int32. it can use __builtin_popcount but this function is not used on GCC environment because it uses __builtin_ctz. When another function uses this, using __builtin_popcount should be re-considered. * internal.h (rb_popcount64): ditto. * internal.h (ntz_int32): defined for ntz_intptr. * internal.h (ntz_int64): defined for ntz_intptr. * internal.h (ntz_intptr): defined as ntz for uintptr_t. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'internal.h')
-rw-r--r--internal.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 7793c1a..a8f4240 100644
--- a/internal.h
+++ b/internal.h
@@ -260,6 +260,52 @@ nlz_int128(uint128_t x)
}
#endif
+static inline int
+rb_popcount32(uint32_t x) {
+ x = (x & 0x55555555) + (x >> 1 & 0x55555555);
+ x = (x & 0x33333333) + (x >> 2 & 0x33333333);
+ x = (x & 0x0f0f0f0f) + (x >> 4 & 0x0f0f0f0f);
+ x = (x & 0x001f001f) + (x >> 8 & 0x001f001f);
+ return (x & 0x0000003f) + (x >>16 & 0x0000003f);
+}
+
+static inline int
+rb_popcount64(uint64_t x) {
+ x = (x & 0x5555555555555555) + (x >> 1 & 0x5555555555555555);
+ x = (x & 0x3333333333333333) + (x >> 2 & 0x3333333333333333);
+ x = (x & 0x0707070707070707) + (x >> 4 & 0x0707070707070707);
+ x = (x & 0x001f001f001f001f) + (x >> 8 & 0x001f001f001f001f);
+ x = (x & 0x0000003f0000003f) + (x >>16 & 0x0000003f0000003f);
+ return (x & 0x7f) + (x >>32 & 0x7f);
+}
+
+static inline int
+ntz_int32(uint32_t x) {
+#ifdef HAVE_BUILTIN___BUILTIN_CTZ
+ return __builtin_ctz(x);
+#else
+ return rb_popcount32((~x) & (x-1));
+#endif
+}
+
+static inline int
+ntz_int64(uint64_t x) {
+#ifdef HAVE_BUILTIN___BUILTIN_CTZLL
+ return __builtin_ctzll(x);
+#else
+ return rb_popcount64((~x) & (x-1));
+#endif
+}
+
+static inline int
+ntz_intptr(uintptr_t x) {
+#if SIZEOF_VOIDP == 8
+ return ntz_int64(x);
+#elif SIZEOF_VOIDP == 4
+ return ntz_int32(x);
+#endif
+}
+
#if HAVE_LONG_LONG && SIZEOF_LONG * 2 <= SIZEOF_LONG_LONG
# define DLONG LONG_LONG
# define DL2NUM(x) LL2NUM(x)