libFDK/include/mips/cplx_mul.h: use C code instead of ASM

Replace the assembler code by the equivalent in C. This way it will work
for every MIPS ISA. Now the check for __mips_isa_rev < 6 is no longer
necessary, so remove it.
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

libFDK/include/mips/cplx_mul.h

@@ -89,7 +89,7 @@ amm-info@iis.fraunhofer.de
 ******************************************************************************/
 
 
-#if defined(__GNUC__) && defined(__mips_isa_rev) && __mips_isa_rev < 6
+#if defined(__GNUC__) && defined(__mips__)
 
 
 //#define FUNCTION_cplxMultDiv2_32x16
@@ -107,24 +107,8 @@ inline void cplxMultDiv2( FIXP_DBL *c_Re,
                           FIXP_DBL  b_Re,
                           FIXP_DBL  b_Im)
 {
-  INT result;
-
-   __asm__ ("mult %[a_Re], %[b_Re];\n"
-            "msub %[a_Im], %[b_Im];\n"
-            "mfhi %[result];\n"
-       : [result]"=r"(result)
-       : [a_Re]"d"(a_Re), [b_Re]"d"(b_Re),  [a_Im]"d"(a_Im), [b_Im]"d"(b_Im)
-       : "lo");
-
-   *c_Re = result;
-
-   __asm__ ("mult %[a_Re], %[b_Im];\n"
-            "madd %[a_Im], %[b_Re];\n"
-            "mfhi %[result];\n"
-       : [result]"=r"(result) 
-       : [a_Re]"r"(a_Re), [b_Im]"r"(b_Im), [a_Im]"r"(a_Im), [b_Re]"r"(b_Re)
-       : "lo");
-   *c_Im = result;
+  *c_Re = (((long long)a_Re * (long long)b_Re) - ((long long)a_Im * (long long)b_Im))>>32;
+  *c_Im = (((long long)a_Re * (long long)b_Im) + ((long long)a_Im * (long long)b_Re))>>32;
 }
 #endif
 
@@ -136,25 +120,8 @@ inline void cplxMult( FIXP_DBL *c_Re,
                       FIXP_DBL  b_Re,
                       FIXP_DBL  b_Im)
 {
-  INT result;
-
-   __asm__ ("mult %[a_Re], %[b_Re];\n"
-            "msub %[a_Im], %[b_Im];\n"
-            "mfhi %[result];\n"
-            //"extr_w %[result], 31;\n"
-        : [result]"=r"(result)
-        : [a_Re]"r"(a_Re), [b_Re]"r"(b_Re), [a_Im]"r"(a_Im), [b_Im]"r"(b_Im)
-        : "lo");
-   *c_Re = result<<1;
-
-   __asm__ ("mult %[a_Re], %[b_Im];\n"
-            "madd %[a_Im], %[b_Re];\n"
-            "mfhi %[result];\n"
-            //"extr_w %[result], 31;\n"
-        : [result]"=r"(result)
-        : [a_Re]"r"(a_Re), [b_Im]"r"(b_Im), [a_Im]"r"(a_Im), [b_Re]"r"(b_Re)
-        : "lo");
-   *c_Im = result<<1;
+  *c_Re = ((((long long)a_Re * (long long)b_Re) - ((long long)a_Im * (long long)b_Im))>>32)<<1;
+  *c_Im = ((((long long)a_Re * (long long)b_Im) + ((long long)a_Im * (long long)b_Re))>>32)<<1;
 }
 #endif