Math library optimatizations for FPU only apply to ARMv8 which is not yet supported.

arch/arm/Kconfig

@@ -302,6 +302,10 @@ config ARCH_CORTEXM0
 	select ARCH_HAVE_IRQPRIO
 	select ARCH_HAVE_RESET
 
+config ARCH_CORTEXM23
+	bool
+	default n
+
 config ARCH_CORTEXM3
 	bool
 	default n
@@ -310,6 +314,10 @@ config ARCH_CORTEXM3
 	select ARCH_HAVE_HIPRI_INTERRUPT
 	select ARCH_HAVE_RESET
 
+config ARCH_CORTEXM33
+	bool
+	default n
+
 config ARCH_CORTEXM4
 	bool
 	default n

libc/machine/Kconfig

@@ -3,70 +3,58 @@
 # see the file kconfig-language.txt in the NuttX tools repository.
 #
 
+# These are library functions that may be overriden by architecture-
+# specific implementations.  Not all architectures support implementations
+# for every library function.
+
 config LIBM_ARCH_CEIL
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_FLOOR
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_NEARBYINT
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_RINT
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_ROUND
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_TRUNC
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_CEILF
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_FLOORF
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_NEARBYINTF
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_RINTF
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_ROUNDF
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
 config LIBM_ARCH_TRUNCF
 	default n
-	depends on LIBC_ARCHOPT
+	depends on LIBM && ARCH_CORTEXM33
 
-config LIBC_ARCHOPT
-	bool "Architecture specific optimizations"
-	default n
-	select LIBM_ARCH_CEIL if CONFIG_ARCH_DPFPU
-	select LIBM_ARCH_FLOOR if CONFIG_ARCH_DPFPU
-	select LIBM_ARCH_NEARBYINT if CONFIG_ARCH_DPFPU
-	select LIBM_ARCH_RINT if CONFIG_ARCH_DPFPU
-	select LIBM_ARCH_ROUND if CONFIG_ARCH_DPFPU
-	select LIBM_ARCH_TRUNC if CONFIG_ARCH_DPFPU
-	select LIBM_ARCH_CEILF if CONFIG_ARCH_FPU
-	select LIBM_ARCH_FLOORF if CONFIG_ARCH_FPU
-	select LIBM_ARCH_NEARBYINTF if CONFIG_ARCH_FPU
-	select LIBM_ARCH_RINTF if CONFIG_ARCH_FPU
-	select LIBM_ARCH_ROUNDF if CONFIG_ARCH_FPU
-	select LIBM_ARCH_TRUNCF if CONFIG_ARCH_FPU
-	depends on ARCH_ARM && LIBM
-	---help---
-		Enable architecture specific optimizations.  Currently only
-		available for use with ARM and only for the NuttX math library.
+if ARCH_CORTEXM33
+source libc/machine/armv8/Kconfig
+endif

libc/machine/Make.defs

@@ -33,8 +33,6 @@
 #
 ############################################################################
 
-ifeq ($(CONFIG_LIBC_ARCHOPT),y)
-ifeq ($(CONFIG_ARCH_ARM),y)
-include ${TOPDIR}/libc/machine/arm/Make.defs
-endif
+ifeq ($(CONFIG_ARCH_CORTEXM33),y)
+include ${TOPDIR}/libc/machine/armv8/Make.defs
 endif

libc/machine/armv8/Kconfig

@@ -0,0 +1,27 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+if ARCH_CORTEXM33
+
+config ARMV8_LIBM
+	bool "Architecture specific optimizations"
+	default n
+	select LIBM_ARCH_CEIL if CONFIG_ARCH_DPFPU
+	select LIBM_ARCH_FLOOR if CONFIG_ARCH_DPFPU
+	select LIBM_ARCH_NEARBYINT if CONFIG_ARCH_DPFPU
+	select LIBM_ARCH_RINT if CONFIG_ARCH_DPFPU
+	select LIBM_ARCH_ROUND if CONFIG_ARCH_DPFPU
+	select LIBM_ARCH_TRUNC if CONFIG_ARCH_DPFPU
+	select LIBM_ARCH_CEILF if CONFIG_ARCH_FPU
+	select LIBM_ARCH_FLOORF if CONFIG_ARCH_FPU
+	select LIBM_ARCH_NEARBYINTF if CONFIG_ARCH_FPU
+	select LIBM_ARCH_RINTF if CONFIG_ARCH_FPU
+	select LIBM_ARCH_ROUNDF if CONFIG_ARCH_FPU
+	select LIBM_ARCH_TRUNCF if CONFIG_ARCH_FPU
+	depends on LIBM
+	---help---
+		Enable ARMv8 specific floating point optimizations.
+
+endif

libc/machine/armv8/Make.defs

@@ -1,5 +1,5 @@
 ############################################################################
-# libc/machine/arm/Make.defs
+# libc/machine/armv8/Make.defs
 #
 #   Copyright (C) 2017 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -33,21 +33,57 @@
 #
 ############################################################################
 
-ifeq ($(CONFIG_LIBM),y)
-ifeq ($(CONFIG_ARCH_FPU),y)
+ifeq ($(CONFIG_ARMV8_LIBM),y)
 
-CSRCS += lib_ceilf.c lib_floorf.c lib_nearbyintf.c lib_rintf.c
-CSRCS += lib_roundf.c lib_truncf.c
+ifeq ($(LIBM_ARCH_CEIL),y)
+CSRCS += arch_ceil.c
+endif
 
-ifeq ($(CONFIG_ARCH_DPFPU),y)
+ifeq ($(LIBM_ARCH_CEILF),y)
+CSRCS += arch_ceilf.c
+endif
 
-CSRCS += lib_ceil.c lib_floor.c lib_nearbyint.c lib_rint.c lib_round.c
-CSRCS += lib_trunc.c
+ifeq ($(LIBM_ARCH_FLOOR),y)
+CSRCS += arch_floor.c
+endif
 
-endif # CONFIG_ARCH_DPFPU
+ifeq ($(LIBM_ARCH_FLOORF),y)
+CSRCS += arch_floorf.c
+endif
 
-DEPPATH += --dep-path machine/arm
-VPATH += :machine/arm
+ifeq ($(LIBM_ARCH_NEARBYINT),y)
+CSRCS += arch_nearbyint.c
+endif
 
-endif # CONFIG_ARCH_FPU
-endif # CONFIG_LIBM
+ifeq ($(LIBM_ARCH_NEARBYINTF),y)
+CSRCS += arch_nearbyintf.c
+endif
+
+ifeq ($(LIBM_ARCH_RINTF),y)
+CSRCS += arch_rintf.c
+endif
+
+ifeq ($(LIBM_ARCH_ROUNDF),y)
+CSRCS += arch_roundf.c
+endif
+
+ifeq ($(LIBM_ARCH_TRUNCF),y)
+CSRCS += arch_truncf.c
+endif
+
+ifeq ($(LIBM_ARCH_RINT),y)
+CSRCS += arch_rint.c
+endif
+
+ifeq ($(LIBM_ARCH_ROUND),y)
+CSRCS += arch_round.c
+endif
+
+ifeq ($(LIBM_ARCH_TRUNC),y)
+CSRCS += arch_trunc.c
+endif
+
+DEPPATH += --dep-path machine/armv8
+VPATH += :machine/armv8
+
+endif # CONFIG_ARMV8_LIBM

libc/machine/armv8/arch_ceil.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_ceil.c
+ * libc/machine/armv8/arch_ceil.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_ceilf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_ceilf.c
+ * libc/machine/armv8/arch_ceilf.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_floor.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_floor.c
+ * libc/machine/armv8/arch_floor.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_floorf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_floorf.c
+ * libc/machine/armv8/arch_floorf.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_nearbyint.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_nearbyint.c
+ * libc/machine/armv8/arch_nearbyint.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_nearbyintf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_nearbyintf.c
+ * libc/machine/armv8/arch_nearbyintf.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_rint.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_rint.c
+ * libc/machine/armv8/arch_rint.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_rintf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_rintf.c
+ * libc/machine/armv8/arch_rintf.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_round.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_round.c
+ * libc/machine/armv8/arch_round.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_roundf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_roundf.c
+ * libc/machine/armv8/arch_roundf.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_trunc.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_trunc.c
+ * libc/machine/armv8/arch_trunc.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *

libc/machine/armv8/arch_truncf.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libc/machine/arm/lib_truncf.c
+ * libc/machine/armv8/arch_truncf.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *