Replace unused macro with cl_unused.

[cln.git] / src / float / transcendental / cl_LF_ratseries_q.cc

diff --git a/src/float/transcendental/cl_LF_ratseries_q.cc b/src/float/transcendental/cl_LF_ratseries_q.cc
index 7897bb2da0c99705261f8fd4bc824ceb68bd27b4..6f9818df63216ae750a779a370922cbf7c7eb442 100644 (file)
--- a/src/float/transcendental/cl_LF_ratseries_q.cc
+++ b/src/float/transcendental/cl_LF_ratseries_q.cc
@@ -1,18 +1,18 @@
-// eval_rational_series().
+// eval_rational_series<bool>().
 
 // General includes.
-#include "cl_sysdep.h"
+#include "base/cl_sysdep.h"
 
 // Specification.
-#include "cl_LF_tran.h"
+#include "float/transcendental/cl_LF_tran.h"
 
 
 // Implementation.
 
 #include "cln/lfloat.h"
 #include "cln/integer.h"
-#include "cln/abort.h"
-#include "cl_LF.h"
+#include "cln/exception.h"
+#include "float/lfloat/cl_LF.h"
 
 namespace cln {
 
@@ -28,7 +28,7 @@ static void eval_q_series_aux (uintC N1, uintC N2,
 {
        switch (N2 - N1) {
        case 0:
-               cl_abort(); break;
+               throw runtime_exception(); break;
        case 1:
                *Q = args.qv[N1];
                *T = 1;
@@ -74,7 +74,75 @@ static void eval_q_series_aux (uintC N1, uintC N2,
        }
 }
 
-const cl_LF eval_rational_series (uintC N, const cl_q_series& args, uintC len)
+template<>
+const cl_LF eval_rational_series<false> (uintC N, const cl_q_series& args, uintC len)
+{
+       if (N==0)
+               return cl_I_to_LF(0,len);
+       var cl_I Q, T;
+       eval_q_series_aux(0,N,args,&Q,&T);
+       return cl_I_to_LF(T,len) / cl_I_to_LF(Q,len);
+}
+
+static void eval_q_series_aux (uintC N1, uintC N2,
+                               cl_q_series_stream& args,
+                               cl_I* Q, cl_I* T)
+{
+       switch (N2 - N1) {
+       case 0:
+               throw runtime_exception(); break;
+       case 1: {
+               var cl_q_series_term v0 = args.next(); // [N1]
+               *Q = v0.q;
+               *T = 1;
+               break;
+               }
+       case 2: {
+               var cl_q_series_term v0 = args.next(); // [N1]
+               var cl_q_series_term v1 = args.next(); // [N1+1]
+               *Q = v0.q * v1.q;
+               *T = v1.q + 1;
+               break;
+               }
+       case 3: {
+               var cl_q_series_term v0 = args.next(); // [N1]
+               var cl_q_series_term v1 = args.next(); // [N1+1]
+               var cl_q_series_term v2 = args.next(); // [N1+2]
+               var cl_I q12 = v1.q * v2.q;
+               *Q = v0.q * q12;
+               *T = q12 + v2.q + 1;
+               break;
+               }
+       case 4: {
+               var cl_q_series_term v0 = args.next(); // [N1]
+               var cl_q_series_term v1 = args.next(); // [N1+1]
+               var cl_q_series_term v2 = args.next(); // [N1+2]
+               var cl_q_series_term v3 = args.next(); // [N1+3]
+               var cl_I q23 = v2.q * v3.q;
+               var cl_I q123 = v1.q * q23;
+               *Q = v0.q * q123;
+               *T = q123 + q23 + v3.q + 1;
+               break;
+               }
+       default: {
+               var uintC Nm = (N1+N2)/2; // midpoint
+               // Compute left part.
+               var cl_I LQ, LT;
+               eval_q_series_aux(N1,Nm,args,&LQ,&LT);
+               // Compute right part.
+               var cl_I RQ, RT;
+               eval_q_series_aux(Nm,N2,args,&RQ,&RT);
+               // Put together partial results.
+               *Q = LQ*RQ;
+               // S = LS + 1/LQ * RS, so T = RQ*LT + RT.
+               *T = RQ*LT + RT;
+               break;
+               }
+       }
+}
+
+template<>
+const cl_LF eval_rational_series<false> (uintC N, cl_q_series_stream& args, uintC len)
 {
        if (N==0)
                return cl_I_to_LF(0,len);