Some optimisations

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 16 insertions, 6 deletions

diff --git a/src/zand.c b/src/zand.c
index a8f53a6..6d3a184 100644
--- a/src/zand.c
+++ b/src/zand.c
@@ -2,14 +2,25 @@
 #include "internals.h"
 
 
-static inline O2 void
-zand_impl(zahl_char_t *restrict a, const zahl_char_t *restrict b, size_t n)
+O2 static inline void
+zand_impl_3(register zahl_char_t *restrict a,
+	    register const zahl_char_t *restrict b, size_t n)
 {
 	size_t i;
 	for (i = 0; i < n; i++)
 		a[i] &= b[i];
 }
 
+static inline void
+zand_impl_4(register zahl_char_t *restrict a,
+	    register const zahl_char_t *restrict b,
+	    register const zahl_char_t *restrict c, size_t n)
+{
+	size_t i;
+	for (i = 0; i < n; i++)
+		a[i] = b[i] & c[i];
+}
+
 void
 zand(z_t a, z_t b, z_t c)
 {
@@ -25,13 +36,12 @@ zand(z_t a, z_t b, z_t c)
 	a->used = MIN(b->used, c->used);
 
 	if (a == b) {
-		zand_impl(a->chars, c->chars, a->used);
+		zand_impl_3(a->chars, c->chars, a->used);
 	} else if (unlikely(a == c)) {
-		zand_impl(a->chars, b->chars, a->used);
+		zand_impl_3(a->chars, b->chars, a->used);
 	} else {
 		ENSURE_SIZE(a, a->used);
-		zmemcpy(a->chars, c->chars, a->used);
-		zand_impl(a->chars, b->chars, a->used);
+		zand_impl_4(a->chars, b->chars, c->chars, a->used);
 	}
 
 	TRIM_AND_SIGN(a, zpositive1(b, c) * 2 - 1);