add cfrac benchmark

1 files changed, 36 insertions, 0 deletions

diff --git a/src/benchmarks/cfrac/phalf.c b/src/benchmarks/cfrac/phalf.c
new file mode 100644
index 0000000..8658de5
--- /dev/null
+++ b/src/benchmarks/cfrac/phalf.c
@@ -0,0 +1,36 @@
+#include <string.h>
+#include "pdefs.h"
+#include "precision.h"
+
+#ifdef ASM_16BIT
+#include "asm16bit.h"
+#endif
+
+/*
+ * Divide a precision by 2 
+ */
+precision phalf(u)
+   register precision u;
+{
+#ifdef ASM_16BIT
+   register precision w;
+   register posit usize;
+
+   pparm(u);
+   usize = u->size;
+   w = palloc(usize);
+   if (w == pUndef) return w;
+
+   w->sign = u->sign;
+   (void) memcpy(w->value, u->value, usize * sizeof(digit));
+
+   memlsrw(w->value, usize);		/* 68000 assembly language routine */
+   if (usize > 1 && w->value[usize-1] == (digit) 0) {	      /* normalize */
+      --(w->size);
+   }
+   pdestroy(u);
+   return presult(w);
+#else
+   return pdiv(u, ptwo);
+#endif
+}