testing/libc/arch_libc: Add a throughput benchmark.

testing/libc/arch_libc/CMakeLists.txt

@@ -21,6 +21,10 @@
 # ##############################################################################
 
 if(CONFIG_TESTING_ARCH_LIBC)
+  if(CONFIG_TESTING_ARCH_LIBC_BENCH)
+    set(bench_srcs arch_libc_bench.c)
+  endif()
+
   nuttx_add_application(
     NAME
     ${CONFIG_TESTING_ARCH_LIBC_PROGNAME}
@@ -31,5 +35,6 @@ if(CONFIG_TESTING_ARCH_LIBC)
     MODULE
     ${CONFIG_TESTING_ARCH_LIBC}
     SRCS
-    arch_libc_test_main.c)
+    arch_libc_test_main.c
+    ${bench_srcs})
 endif()

testing/libc/arch_libc/Kconfig

@@ -43,6 +43,18 @@ config TESTING_ARCH_LIBC_STRCPY
 	bool "test strcpy"
 	default y
 
+config TESTING_ARCH_LIBC_MEMCCPY
+	bool "test memccpy"
+	default y
+
+config TESTING_ARCH_LIBC_STPNCPY
+	bool "test stpncpy"
+	default y
+
+config TESTING_ARCH_LIBC_STRLCPY
+	bool "test strlcpy"
+	default y
+
 config TESTING_ARCH_LIBC_STRLEN
 	bool "test strlen"
 	default y
@@ -75,6 +87,32 @@ config TESTING_ARCH_LIBC_STRCHRNUL
 	bool "test strchrnul"
 	default y
 
+config TESTING_ARCH_LIBC_BENCH
+	bool "throughput benchmark"
+	default n
+	---help---
+		Measure each function across a size sweep and every source and
+		destination alignment pair, reporting MB/s and cycles per byte.
+		An implementation usually takes its wide path only when the
+		pointers meet some alignment condition, so an aligned measurement
+		alone does not show what the rest of the input space costs.
+
+if TESTING_ARCH_LIBC_BENCH
+
+config TESTING_ARCH_LIBC_BENCH_BUFSIZE
+	int "benchmark buffer size"
+	default 262144
+	---help---
+		Size of each of the two buffers the benchmark allocates.
+
+config TESTING_ARCH_LIBC_BENCH_MINMS
+	int "minimum milliseconds per measurement"
+	default 250
+	---help---
+		Each measurement repeats until it has run for at least this long.
+
+endif
+
 config TESTING_ARCH_LIBC_PROGNAME
 	string "Program name"
 	default "arch_libctest"

testing/libc/arch_libc/Makefile

@@ -31,6 +31,10 @@ MODULE = $(CONFIG_TESTING_ARCH_LIBC)
 
 # arch libc test
 
+ifneq ($(CONFIG_TESTING_ARCH_LIBC_BENCH),)
+CSRCS += arch_libc_bench.c
+endif
+
 MAINSRC = arch_libc_test_main.c
 
 include $(APPDIR)/Application.mk