fixed-point: introduce MULT16_32_32 to handle unexpected types in MULT16_32_Q15

Author: karlt

libspeexdsp/arch.h

@@ -177,6 +177,7 @@ typedef float spx_word32_t;
 #define ADD32(a,b) ((a)+(b))
 #define SUB32(a,b) ((a)-(b))
 #define MULT16_16_16(a,b)     ((a)*(b))
+#define MULT16_32_32(a,b)     ((a)*(b))
 #define MULT16_16(a,b)     ((spx_word32_t)(a)*(spx_word32_t)(b))
 #define MAC16_16(c,a,b)     ((c)+(spx_word32_t)(a)*(spx_word32_t)(b))
 

libspeexdsp/fixed_debug.h

@@ -250,6 +250,21 @@ static inline short MULT16_16_16(int a, int b)
    return res;
 }
 
+/* result fits in 32 bits */
+static inline int MULT16_32_32(int a, long long b)
+{
+   long long res;
+   if (!VERIFY_SHORT(a) || !VERIFY_INT(b))
+   {
+      fprintf (stderr, "MULT16_32_32: inputs are not short+int: %d %d\n", a, (int)b);
+   }
+   res = a*b;
+   if (!VERIFY_INT(res))
+      fprintf (stderr, "MULT16_32_32: output is not int: %d\n", (int)res);
+   spx_mips++;
+   return res;
+}
+
 #define MULT16_16(a, b) _MULT16_16(a, b, __FILE__, __LINE__)
 static inline int _MULT16_16(int a, int b, char *file, int line)
 {

libspeexdsp/fixed_generic.h

@@ -69,16 +69,18 @@
 
 
 /* result fits in 16 bits */
-#define MULT16_16_16(a,b)     ((((spx_word16_t)(a))*((spx_word16_t)(b))))
+#define MULT16_16_16(a,b)     (((spx_word16_t)(a))*((spx_word16_t)(b)))
+/* result fits in 32 bits */
+#define MULT16_32_32(a,b)     (((spx_word16_t)(a))*((spx_word32_t)(b)))
 
 /* (spx_word32_t)(spx_word16_t) gives TI compiler a hint that it's 16x16->32 multiply */
 #define MULT16_16(a,b)     (((spx_word32_t)(spx_word16_t)(a))*((spx_word32_t)(spx_word16_t)(b)))
 
 #define MAC16_16(c,a,b) (ADD32((c),MULT16_16((a),(b))))
 
-#define MULT16_32_P15(a,b) ADD32((a)*SHR((b),15), PSHR(MULT16_16((a),((b)&0x00007fff)),15))
-#define MULT16_32_Q15(a,b) ADD32((a)*SHR((b),15), SHR(MULT16_16((a),((b)&0x00007fff)),15))
-#define MAC16_32_Q15(c,a,b) ADD32(c,ADD32((a)*SHR((b),15), SHR(MULT16_16((a),((b)&0x00007fff)),15)))
+#define MULT16_32_P15(a,b) ADD32(MULT16_32_32(a,SHR((b),15)), PSHR(MULT16_16((a),((b)&0x00007fff)),15))
+#define MULT16_32_Q15(a,b) ADD32(MULT16_32_32(a,SHR((b),15)), SHR(MULT16_16((a),((b)&0x00007fff)),15))
+#define MAC16_32_Q15(c,a,b) ADD32(c,MULT16_32_Q15(a,b))
 
 
 #define MAC16_16_Q11(c,a,b)     (ADD32((c),SHR(MULT16_16((a),(b)),11)))