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Re: [PATCH roland/arm-ifunc-test] ARM: Clean up __libc_ifunc_impl_list
- From: Roland McGrath <roland at hack dot frob dot com>
- To: "Joseph S. Myers" <joseph at codesourcery dot com>
- Cc: <libc-ports at sourceware dot org>
- Date: Mon, 17 Jun 2013 15:06:23 -0700 (PDT)
- Subject: Re: [PATCH roland/arm-ifunc-test] ARM: Clean up __libc_ifunc_impl_list
- References: <20130617205540 dot 06E142C09B at topped-with-meat dot com> <Pine dot LNX dot 4 dot 64 dot 1306172134130 dot 15498 at digraph dot polyomino dot org dot uk>
> I don't understand why this #define is present for the
> runtime-determined-NEON case (to match the existing code, I'd think it
> should rather be for the compile-time-NEON-enabled case).
Oops. Here's a better version.
Thanks,
Roland
ports/ChangeLog.arm
2013-06-17 Roland McGrath <roland@hack.frob.com>
* sysdeps/arm/armv7/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list)
[__ARM_NEON__]: Do not refer to HWCAP_ARM_NEON.
[!__SOFTFP__]: Do not refer to HWCAP_ARM_VFP.
--- a/ports/sysdeps/arm/armv7/multiarch/ifunc-impl-list.c
+++ b/ports/sysdeps/arm/armv7/multiarch/ifunc-impl-list.c
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+#include <stdbool.h>
#include <string.h>
#include <ldsodefs.h>
#include <sysdep.h>
@@ -29,21 +30,25 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
size_t max)
{
size_t i = 0;
- int hwcap;
- hwcap = GLRO(dl_hwcap);
-
- IFUNC_IMPL (i, name, memcpy,
- IFUNC_IMPL_ADD (array, i, memcpy, hwcap & HWCAP_ARM_NEON,
+ bool use_neon = true;
#ifdef __ARM_NEON__
- memcpy
+# define __memcpy_neon memcpy
#else
- __memcpy_neon
+ use_neon = (GLRO(dl_hwcap) & HWCAP_ARM_NEON) != 0;
#endif
- )
+
+#ifndef __ARM_NEON__
+ bool use_vfp = true;
+# ifdef __SOFTFP__
+ use_neon = (GLRO(dl_hwcap) & HWCAP_ARM_VFP) != 0;
+# endif
+#endif
+
+ IFUNC_IMPL (i, name, memcpy,
+ IFUNC_IMPL_ADD (array, i, memcpy, use_neon, __memcpy_neon)
#ifndef __ARM_NEON__
- IFUNC_IMPL_ADD (array, i, memcpy, hwcap & HWCAP_ARM_VFP,
- __memcpy_vfp)
+ IFUNC_IMPL_ADD (array, i, memcpy, use_vfp, __memcpy_vfp)
#endif
IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_arm));