[AArch64] Add ifunc support for Ares

Add Ares to the midr_el0 list and support ifunc dispatch.  Since Ares
supports 2 128-bit loads/stores, use Neon registers for memcpy by
selecting __memcpy_falkor by default (we should rename this to
__memcpy_simd or similar).

	* manual/tunables.texi (glibc.cpu.name): Add ares tunable.
	* sysdeps/aarch64/multiarch/memcpy.c (__libc_memcpy): Use
	__memcpy_falkor for ares.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_ARES):
	Add new define.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.c (cpu_list):
	Add ares cpu.

(cherry picked from commit 02f440c1ef5d5d79552a524065aa3e2fabe469b9)

diff --git a/ChangeLog b/ChangeLog
index dd2106c401cdc2cecb9203faf8efdf23246941d2..3265e61ad77ce7928b00816a93ad2e2642610496 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2019-09-06  Wilco Dijkstra  <wdijkstr@arm.com>
+
+       * manual/tunables.texi (glibc.cpu.name): Add ares tunable.
+       * sysdeps/aarch64/multiarch/memcpy.c (__libc_memcpy): Use
+       __memcpy_falkor for ares.
+       * sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_ARES):
+       Add new define.
+       * sysdeps/unix/sysv/linux/aarch64/cpu-features.c (cpu_list):
+       Add ares cpu.
+
 2019-09-06  Siddhesh Poyarekar  <siddhesh@sourceware.org>
 
        * sysdeps/aarch64/multiarch/memcpy_falkor.S (__memcpy_falkor):

diff --git a/manual/tunables.texi b/manual/tunables.texi
index a310e38acd04eb5a904b3abb13f118416832c9f4..8506833c37a8b91a4fa8688e6358395229da710f 100644 (file)
--- a/manual/tunables.texi
+++ b/manual/tunables.texi
@@ -333,7 +333,7 @@ This tunable is specific to powerpc, powerpc64 and powerpc64le.
 The @code{glibc.tune.cpu=xxx} tunable allows the user to tell @theglibc{} to
 assume that the CPU is @code{xxx} where xxx may have one of these values:
 @code{generic}, @code{falkor}, @code{thunderxt88}, @code{thunderx2t99},
-@code{thunderx2t99p1}.
+@code{thunderx2t99p1}, @code{ares}.
 
 This tunable is specific to aarch64.
 @end deftp

diff --git a/sysdeps/aarch64/multiarch/memcpy.c b/sysdeps/aarch64/multiarch/memcpy.c
index 3efea2c6448a10000c3e028928a637da9b0d3905..abeca6cff40d3a36815060056bfd42a4abd9e3c8 100644 (file)
--- a/sysdeps/aarch64/multiarch/memcpy.c
+++ b/sysdeps/aarch64/multiarch/memcpy.c
@@ -35,7 +35,7 @@ extern __typeof (__redirect_memcpy) __memcpy_falkor attribute_hidden;
 libc_ifunc (__libc_memcpy,
             (IS_THUNDERX (midr)
             ? __memcpy_thunderx
-            : (IS_FALKOR (midr)
+            : (IS_FALKOR (midr) || IS_ARES (midr)
                ? __memcpy_falkor
                : __memcpy_generic)));
 

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index 33b87a8c46ef9a9b4e01d1bff4dfe3f3dfcbdd7c..e3fb09edd802fc21f3786ff31dee04ae638ab17c 100644 (file)
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -35,6 +35,7 @@ static struct cpu_list cpu_list[] = {
       {"thunderxt88",   0x430F0A10},
       {"thunderx2t99",   0x431F0AF0},
       {"thunderx2t99p1", 0x420F5160},
+      {"ares",          0x411FD0C0},
       {"generic",       0x0}
 };
 

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
index c646f9dad132ce94fb4b306f2fdbd7e3728e5098..9e315751c2a26a3805cb2ef68afb231503312a53 100644 (file)
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
@@ -44,6 +44,9 @@
 #define IS_FALKOR(midr) (MIDR_IMPLEMENTOR(midr) == 'Q'                       \
                         && MIDR_PARTNUM(midr) == 0xc00)
 
+#define IS_ARES(midr) (MIDR_IMPLEMENTOR(midr) == 'A'                         \
+                       && MIDR_PARTNUM(midr) == 0xd0c)
+
 struct cpu_features
 {
   uint64_t midr_el1;