optimized samplebuffer copying

Makefile

@@ -8,7 +8,7 @@ TARGET_PLATFORM = L4
 
 # Compiler options here.
 ifeq ($(USE_OPT),)
-  USE_OPT = -Os -g3 -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nosys.specs
+  USE_OPT = -O0 -g3 -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nosys.specs
 endif
 
 # C specific options here (added to USE_OPT).
@@ -177,9 +177,9 @@ CPPWARN = -Wall -Wextra -Wundef -pedantic -Wno-volatile
 
 # List all user C define here, like -D_DEBUG=1
 UDEFS = -DCORTEX_ENABLE_WFI_IDLE=TRUE \
-		-DPORT_USE_SYSCALL=TRUE \
-		-DPORT_USE_GUARD_MPU_REGION=MPU_REGION_0 \
-		-DTARGET_PLATFORM_$(TARGET_PLATFORM)
+        -DPORT_USE_SYSCALL=TRUE \
+        -DPORT_USE_GUARD_MPU_REGION=MPU_REGION_0 \
+        -DTARGET_PLATFORM_$(TARGET_PLATFORM)
 
 # Define ASM defines here
 UADEFS =

source/handlers.cpp

@@ -105,7 +105,7 @@ void MemManage_Handler()
 {
     // 1. Get the stack pointer.
     uint32_t lr;
-	asm("mov %0, lr" : "=r" (lr));
+    asm("mov %0, lr" : "=r" (lr));
 
     // 2. Recover from the fault.
     ConversionManager::abort();
@@ -120,14 +120,14 @@ void HardFault_Handler()
     // Get the stack pointer.
     //uint32_t *stack;
     uint32_t lr;
-	asm("mov %0, lr" : "=r" (lr));
-	/*asm("\
-		tst lr, #4; \
-		ite eq; \
-		mrseq %0, msp; \
-		mrsne %0, psp; \
+    asm("mov %0, lr" : "=r" (lr));
+    /*asm("\
+        tst lr, #4; \
+        ite eq; \
+        mrseq %0, msp; \
+        mrsne %0, psp; \
         mov %1, lr; \
-	" : "=r" (stack), "=r" (lr));*/
+    " : "=r" (stack), "=r" (lr));*/
 
     // If coming from the algorithm, attempt to recover; otherwise, give up.
     if (run_status != RunStatus::Running && (lr & 4) != 0)

source/samplebuffer.cpp

@@ -19,8 +19,8 @@ void SampleBuffer::clear() {
 }
 __attribute__((section(".convcode")))
 void SampleBuffer::modify(Sample *data, unsigned int srcsize) {
-    auto size = std::min(srcsize, m_size);
-    size = (size + 15) & 0xFF0;
+    auto size = srcsize < m_size ? srcsize : m_size;
+    size = (size + 15) & (~15);
 
     m_modified = m_buffer;
     const int *src = reinterpret_cast<const int *>(data);
@@ -35,22 +35,22 @@ void SampleBuffer::modify(Sample *data, unsigned int srcsize) {
         int f = src[5];
         int g = src[6];
         int h = src[7];
-	dst[0] = a;
-	dst[1] = b;
-	dst[2] = c;
-	dst[3] = d;
-	dst[4] = e;
-	dst[5] = f;
-	dst[6] = g;
-	dst[7] = h;
-	src += 8;
-	dst += 8;
+        dst[0] = a;
+        dst[1] = b;
+        dst[2] = c;
+        dst[3] = d;
+        dst[4] = e;
+        dst[5] = f;
+        dst[6] = g;
+        dst[7] = h;
+        src += 8;
+        dst += 8;
     } while (src < srcend);
 }
 __attribute__((section(".convcode")))
 void SampleBuffer::midmodify(Sample *data, unsigned int srcsize) {
-    auto size = std::min(srcsize, m_size / 2);
-    size = (size + 15) & 0xFF0;
+    auto size = srcsize < m_size / 2 ? srcsize : m_size / 2;
+    size = (size + 15) & (~15);
 
     m_modified = middata();
     const int *src = reinterpret_cast<const int *>(data);
@@ -65,16 +65,16 @@ void SampleBuffer::midmodify(Sample *data, unsigned int srcsize) {
         int f = src[5];
         int g = src[6];
         int h = src[7];
-	dst[0] = a;
-	dst[1] = b;
-	dst[2] = c;
-	dst[3] = d;
-	dst[4] = e;
-	dst[5] = f;
-	dst[6] = g;
-	dst[7] = h;
-	src += 8;
-	dst += 8;
+        dst[0] = a;
+        dst[1] = b;
+        dst[2] = c;
+        dst[3] = d;
+        dst[4] = e;
+        dst[5] = f;
+        dst[6] = g;
+        dst[7] = h;
+        src += 8;
+        dst += 8;
     } while (src < srcend);
 }