Fix arm_math.h warnings

README.md

@@ -5,5 +5,4 @@ The latest stable version of Teensy's core library is always available in the Te
 http://www.pjrc.com/teensy/td_download.html
 
 
-This github repository contains work-in-progress code, which may not be stable.  It is not recommended for use in actual projects.
 

teensy3/AudioStream.h

@@ -108,8 +108,6 @@ public:
 			cpu_cycles = 0;
 			cpu_cycles_max = 0;
 		}
-	void connect(AudioStream &dest, unsigned char dest_index = 0, unsigned int src_index = 0);
-	void disconnect(void);
 	static void initialize_memory(audio_block_t *data, unsigned int num);
 	int processorUsage(void) { return CYCLE_COUNTER_APPROX_PERCENT(cpu_cycles); }
 	int processorUsageMax(void) { return CYCLE_COUNTER_APPROX_PERCENT(cpu_cycles_max); }

teensy3/arm_math.h

@@ -5326,7 +5326,10 @@ extern "C"
 #else
 
     /* acc += A1 * x[n-1] + A2 * x[n-2]  */
-    acc = __SMLALD(S->A1, (q31_t) __SIMD32(S->state), acc);
+    // TODO: this single-instruction version causes a gcc strict-aliasing warning
+    //acc = __SMLALD(S->A1, (q31_t) __SIMD32(S->state), acc);
+    uint32_t state = (uint32_t)S->state[0] | ((uint32_t)S->state[1] << 16);
+    acc = __SMLALD(S->A1, state, acc);
 
 #endif
 
@@ -5900,7 +5903,7 @@ extern "C"
       /* Iniatilize output for below specified range as least output value of table */
       y = pYData[0];
     }
-    else if(i >= S->nValues)
+    else if((uint32_t)i >= S->nValues)
     {
       /* Iniatilize output for above specified range as last output value of table */
       y = pYData[S->nValues - 1];
@@ -5954,13 +5957,13 @@ extern "C"
     /* Index value calculation */
     index = ((x & 0xFFF00000) >> 20);
 
-    if(index >= (nValues - 1))
+    if(index < 0)
     {
-      return (pYData[nValues - 1]);
+      return (pYData[0]);
     }
-    else if(index < 0)
+    else if((uint32_t)index >= (nValues - 1))
     {
-      return (pYData[0]);
+      return (pYData[nValues - 1]);
     }
     else
     {
@@ -6016,13 +6019,13 @@ extern "C"
     /* Index value calculation */
     index = ((x & 0xFFF00000) >> 20u);
 
-    if(index >= (nValues - 1))
+    if(index < 0)
     {
-      return (pYData[nValues - 1]);
+      return (pYData[0]);
     }
-    else if(index < 0)
+    else if((uint32_t)index >= (nValues - 1))
     {
-      return (pYData[0]);
+      return (pYData[nValues - 1]);
     }
     else
     {
@@ -6077,13 +6080,13 @@ extern "C"
     index = ((x & 0xFFF00000) >> 20u);
 
 
-    if(index >= (nValues - 1))
+    if(index < 0)
     {
-      return (pYData[nValues - 1]);
+      return (pYData[0]);
     }
-    else if(index < 0)
+    else if((uint32_t)index >= (nValues - 1))
     {
-      return (pYData[0]);
+      return (pYData[nValues - 1]);
     }
     else
     {