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authorAnton Samokhvalov <pg83@yandex.ru>2022-02-10 16:45:15 +0300
committerDaniil Cherednik <dcherednik@yandex-team.ru>2022-02-10 16:45:15 +0300
commit72cb13b4aff9bc9cf22e49251bc8fd143f82538f (patch)
treeda2c34829458c7d4e74bdfbdf85dff449e9e7fb8 /contrib/libs/cxxsupp/builtins/popcountsi2.c
parent778e51ba091dc39e7b7fcab2b9cf4dbedfb6f2b5 (diff)
downloadydb-72cb13b4aff9bc9cf22e49251bc8fd143f82538f.tar.gz
Restoring authorship annotation for Anton Samokhvalov <pg83@yandex.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/libs/cxxsupp/builtins/popcountsi2.c')
-rw-r--r--contrib/libs/cxxsupp/builtins/popcountsi2.c66
1 files changed, 33 insertions, 33 deletions
diff --git a/contrib/libs/cxxsupp/builtins/popcountsi2.c b/contrib/libs/cxxsupp/builtins/popcountsi2.c
index 44544ff498..7ef6d899ee 100644
--- a/contrib/libs/cxxsupp/builtins/popcountsi2.c
+++ b/contrib/libs/cxxsupp/builtins/popcountsi2.c
@@ -1,33 +1,33 @@
-/* ===-- popcountsi2.c - Implement __popcountsi2 ---------------------------===
- *
- * The LLVM Compiler Infrastructure
- *
- * This file is dual licensed under the MIT and the University of Illinois Open
- * Source Licenses. See LICENSE.TXT for details.
- *
- * ===----------------------------------------------------------------------===
- *
- * This file implements __popcountsi2 for the compiler_rt library.
- *
- * ===----------------------------------------------------------------------===
- */
-
-#include "int_lib.h"
-
-/* Returns: count of 1 bits */
-
-COMPILER_RT_ABI si_int
-__popcountsi2(si_int a)
-{
- su_int x = (su_int)a;
- x = x - ((x >> 1) & 0x55555555);
- /* Every 2 bits holds the sum of every pair of bits */
- x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
- /* Every 4 bits holds the sum of every 4-set of bits (3 significant bits) */
- x = (x + (x >> 4)) & 0x0F0F0F0F;
- /* Every 8 bits holds the sum of every 8-set of bits (4 significant bits) */
- x = (x + (x >> 16));
- /* The lower 16 bits hold two 8 bit sums (5 significant bits).*/
- /* Upper 16 bits are garbage */
- return (x + (x >> 8)) & 0x0000003F; /* (6 significant bits) */
-}
+/* ===-- popcountsi2.c - Implement __popcountsi2 ---------------------------===
+ *
+ * The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __popcountsi2 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+/* Returns: count of 1 bits */
+
+COMPILER_RT_ABI si_int
+__popcountsi2(si_int a)
+{
+ su_int x = (su_int)a;
+ x = x - ((x >> 1) & 0x55555555);
+ /* Every 2 bits holds the sum of every pair of bits */
+ x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
+ /* Every 4 bits holds the sum of every 4-set of bits (3 significant bits) */
+ x = (x + (x >> 4)) & 0x0F0F0F0F;
+ /* Every 8 bits holds the sum of every 8-set of bits (4 significant bits) */
+ x = (x + (x >> 16));
+ /* The lower 16 bits hold two 8 bit sums (5 significant bits).*/
+ /* Upper 16 bits are garbage */
+ return (x + (x >> 8)) & 0x0000003F; /* (6 significant bits) */
+}