ARM: Make multiarch memcpy always use NEON when compiler does

5 files changed, 43 insertions, 11 deletions

diff --git a/ports/ChangeLog.arm b/ports/ChangeLog.arm
index 372096e719..2565518c5e 100644
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,3 +1,15 @@
+2013-05-13  Roland McGrath  <roland@hack.frob.com>
+
+	* sysdeps/arm/armv7/multiarch/memcpy.S [__ARM_NEON__]: Don't define
+	memcpy here, just __memcpy_arm and __aeabi_memcpy*.
+	* sysdeps/arm/armv7/multiarch/memcpy_neon.S [__ARM_NEON__]:
+	Define memcpy here, not __memcpy_neon.
+	* sysdeps/arm/armv7/multiarch/memcpy_vfp.S [__ARM_NEON__]:
+	Define nothing here.
+	* sysdeps/arm/armv7/multiarch/ifunc-impl-list.c
+	(__libc_ifunc_impl_list) [__ARM_NEON__]: Don't list __memcpy_vfp;
+	use memcpy name for NEON implementation.
+
 2013-05-08  Will Newton  <will.newton@linaro.org>
 
 	* sysdeps/arm/armv7/multiarch/Makefile: New file.
diff --git a/ports/sysdeps/arm/armv7/multiarch/ifunc-impl-list.c b/ports/sysdeps/arm/armv7/multiarch/ifunc-impl-list.c
index 0dcdcd6244..9c2487fd22 100644
--- a/ports/sysdeps/arm/armv7/multiarch/ifunc-impl-list.c
+++ b/ports/sysdeps/arm/armv7/multiarch/ifunc-impl-list.c
@@ -35,9 +35,16 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   IFUNC_IMPL (i, name, memcpy,
 	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & HWCAP_ARM_NEON,
-			      __memcpy_neon)
+#ifdef __ARM_NEON__
+                              memcpy
+#else
+			      __memcpy_neon
+#endif
+                              )
+#ifndef __ARM_NEON__
 	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & HWCAP_ARM_VFP,
 			      __memcpy_vfp)
+#endif
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_arm));
 
   return i;
diff --git a/ports/sysdeps/arm/armv7/multiarch/memcpy.S b/ports/sysdeps/arm/armv7/multiarch/memcpy.S
index 1b12465a8b..81c01d3eac 100644
--- a/ports/sysdeps/arm/armv7/multiarch/memcpy.S
+++ b/ports/sysdeps/arm/armv7/multiarch/memcpy.S
@@ -22,27 +22,29 @@
 #include <sysdep.h>
 #include <rtld-global-offsets.h>
 
-#if !defined NOT_IN_libc
+#ifndef NOT_IN_libc
+/* Under __ARM_NEON__, memcpy_neon.S defines the name memcpy.  */
+# ifndef __ARM_NEON__
 	.text
 ENTRY(memcpy)
 	.type	memcpy, %gnu_indirect_function
-#ifdef __SOFTFP__
+# ifdef __SOFTFP__
 	ldr	r1, .Lmemcpy_arm
 	tst	r0, #HWCAP_ARM_VFP
 	ldrne	r1, .Lmemcpy_vfp
-#else
+# else
 	ldr	r1, .Lmemcpy_vfp
-#endif
+# endif
 	tst	r0, #HWCAP_ARM_NEON
 	ldrne	r1, .Lmemcpy_neon
 1:
 	add	r0, r1, pc
 	DO_RET(lr)
 
-#ifdef __SOFTFP__
+# ifdef __SOFTFP__
 .Lmemcpy_arm:
 	.long	C_SYMBOL_NAME(__memcpy_arm) - 1b - PC_OFS
-#endif
+# endif
 .Lmemcpy_neon:
 	.long	C_SYMBOL_NAME(__memcpy_neon) - 1b - PC_OFS
 .Lmemcpy_vfp:
@@ -51,6 +53,7 @@ ENTRY(memcpy)
 END(memcpy)
 
 libc_hidden_builtin_def (memcpy)
+#endif  /* Not __ARM_NEON__.  */
 
 /* These versions of memcpy are defined not to clobber any VFP or NEON
    registers so they must always call the ARM variant of the memcpy code.  */
diff --git a/ports/sysdeps/arm/armv7/multiarch/memcpy_neon.S b/ports/sysdeps/arm/armv7/multiarch/memcpy_neon.S
index c0ef1f8983..e60d1cc0e1 100644
--- a/ports/sysdeps/arm/armv7/multiarch/memcpy_neon.S
+++ b/ports/sysdeps/arm/armv7/multiarch/memcpy_neon.S
@@ -1,3 +1,9 @@
+#ifdef __ARM_NEON__
+/* Under __ARM_NEON__, this file defines memcpy directly.  */
+libc_hidden_builtin_def (memcpy)
+#else
+# define memcpy __memcpy_neon
+#endif
+
 #define MEMCPY_NEON
-#define memcpy __memcpy_neon
 #include "memcpy_impl.S"
diff --git a/ports/sysdeps/arm/armv7/multiarch/memcpy_vfp.S b/ports/sysdeps/arm/armv7/multiarch/memcpy_vfp.S
index d21b702e90..e008c041ed 100644
--- a/ports/sysdeps/arm/armv7/multiarch/memcpy_vfp.S
+++ b/ports/sysdeps/arm/armv7/multiarch/memcpy_vfp.S
@@ -1,3 +1,7 @@
-#define MEMCPY_VFP
-#define memcpy __memcpy_vfp
-#include "memcpy_impl.S"
+/* Under __ARM_NEON__, memcpy_neon.S defines memcpy directly
+   and the __memcpy_vfp code will never be used.  */
+#ifndef __ARM_NEON__
+# define MEMCPY_VFP
+# define memcpy __memcpy_vfp
+# include "memcpy_impl.S"
+#endif