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-rw-r--r--Makefile1
-rw-r--r--src/main.c4
-rw-r--r--src/new32v3.c20
3 files changed, 24 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index d85c7c7..3d16add 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@ SRC := src/bigtab.c \
src/new.c \
src/new32.c \
src/new32v2.c \
+ src/new32v3.c \
src/null.c \
src/ref.c
diff --git a/src/main.c b/src/main.c
index 4961879..04e0bad 100644
--- a/src/main.c
+++ b/src/main.c
@@ -20,6 +20,7 @@ int ref2(int i, int x, int y);
int new(int i, int x, int y);
int new32(int i, int x, int y);
int new32v2(int i, int x, int y);
+int new32v3(int i, int x, int y);
void bigtab_init(void);
int bigtab(int i, int x, int y);
@@ -38,7 +39,8 @@ static struct solfunc solfuncs[ ] = {
{"bigtab", bigtab},
{"new", new},
{"new32", new32},
- {"new32v2", new32v2}
+ {"new32v2", new32v2},
+ {"new32v3", new32v3}
};
#define PASSES 5
diff --git a/src/new32v3.c b/src/new32v3.c
new file mode 100644
index 0000000..d64459d
--- /dev/null
+++ b/src/new32v3.c
@@ -0,0 +1,20 @@
+#include <stdint.h>
+
+static const unsigned int divtab[730] = {
+ [1] = 0xffff + 1l,
+ [3] = 0x5555 + 1l,
+ [9] = 0x1c71 + 1l,
+ [27] = 0x097b + 1l,
+ [81] = 0x0329 + 1l,
+ [243] = 0x010d + 1l,
+ [729] = 0x0059 + 1l
+};
+
+#define FASTDIV(n, d) (((n) * divtab[d]) >> 16)
+
+int new32v3(int i, int x, int y)
+{
+ int A;
+ A = i + x * y;
+ return A - 3 * y * (FASTDIV(A, 3 * y) - FASTDIV(i, 3 * y));
+}