2 files changed, 16 insertions, 0 deletions
diff --git a/src/mesa/main/imports.c b/src/mesa/main/imports.c
index 8f097195922..345a1c53e2f 100644
--- a/src/mesa/main/imports.c
+++ b/src/mesa/main/imports.c
@@ -527,6 +527,19 @@ _mesa_bitcount(unsigned int n)
    }
    return bits;
 }
+
+/**
+ * Return number of bits set in given 64-bit uint.
+ */
+unsigned int
+_mesa_bitcount_64(uint64_t n)
+{
+   unsigned int bits;
+   for (bits = 0; n > 0; n = n >> 1) {
+      bits += (n & 1);
+   }
+   return bits;
+}
 #endif
 
 
diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index 5fb5581efce..20fa148fe59 100644
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -578,9 +578,12 @@ _mesa_init_sqrt_table(void);
 
 #if ((_GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
 #define _mesa_bitcount(i) __builtin_popcount(i)
+#define _mesa_bitcount_64(i) __builtin_popcountll(i)
 #else
 extern unsigned int
 _mesa_bitcount(unsigned int n);
+extern unsigned int
+_mesa_bitcount_64(uint64_t n);
 #endif
 
 #else