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-rw-r--r--internal.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 0bac79e..765758a 100644
--- a/internal.h
+++ b/internal.h
@@ -271,21 +271,38 @@ nlz_intptr(uintptr_t x) {
static inline int
rb_popcount32(uint32_t x) {
+#ifdef HAVE_BUILTIN___BUILTIN_POPCOUNT
+ return __builtin_popcount(x);
+#else
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);
+#endif
}
static inline int
rb_popcount64(uint64_t x) {
+#ifdef HAVE_BUILTIN___BUILTIN_POPCOUNT
+ return __builtin_popcountll(x);
+#else
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);
+#endif
+}
+
+static inline int
+rb_popcount_intptr(uintptr_t x) {
+#if SIZEOF_VOIDP == 8
+ return rb_popcount64(x);
+#elif SIZEOF_VOIDP == 4
+ return rb_popcount32(x);
+#endif
}
static inline int