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[PATCH 02/21] PowerPC: multiarch memcpy for PowerPC64

From: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
To: "GNU C. Library" <libc-alpha at sourceware dot org>
Date: Tue, 10 Dec 2013 10:29:22 -0200
Subject: [PATCH 02/21] PowerPC: multiarch memcpy for PowerPC64
Authentication-results: sourceware.org; auth=none
References: <52A700A8 dot 3020307 at linux dot vnet dot ibm dot com>
2013-12-09  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

	* sysdeps/powerpc/powerpc64/multiarch/Makefile: New file to support
	multiarch for POWER/PPC64.
	* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c: Likewise.
	* sysdeps/powerpc/powerpc64/multiarch/init-arch.h: Likewise.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy-a2.S: New file.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy-cell.S: New file.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy-power4.S: New file.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy-power6.S: New file.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy-power7.S: New file.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy-ppc64.S: New file.
	* sysdeps/powerpc/powerpc64/multiarch/memcpy.c: New file: multiarch
	memcpy for PPC64.

--

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
new file mode 100644
index 0000000..7467021
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -0,0 +1,4 @@
+ifeq ($(subdir),string)
+sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
+		   memcpy-power4 memcpy-ppc64
+endif
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
new file mode 100644
index 0000000..034e551
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -0,0 +1,66 @@
+/* Enumerate available IFUNC implementations of a function.  PowerPC64 version.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <string.h>
+#include <wchar.h>
+#include <ldsodefs.h>
+#include <ifunc-impl-list.h>
+
+/* Maximum number of IFUNC implementations.  */
+#define MAX_IFUNC	6
+
+size_t
+__libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
+			size_t max)
+{
+  assert (max >= MAX_IFUNC);
+
+  size_t i = 0;
+
+  unsigned long int hwcap = GLRO(dl_hwcap);
+  /* hwcap contains only the latest supported ISA, the code checks which is
+     and fills the previous supported ones.  */
+  if (hwcap & PPC_FEATURE_ARCH_2_06)
+    hwcap |= PPC_FEATURE_ARCH_2_05 | PPC_FEATURE_POWER5_PLUS |
+             PPC_FEATURE_POWER5 | PPC_FEATURE_POWER4;
+  else if (hwcap & PPC_FEATURE_ARCH_2_05)
+    hwcap |= PPC_FEATURE_POWER5_PLUS | PPC_FEATURE_POWER5 | PPC_FEATURE_POWER4;
+  else if (hwcap & PPC_FEATURE_POWER5_PLUS)
+    hwcap |= PPC_FEATURE_POWER5 | PPC_FEATURE_POWER4;
+  else if (hwcap & PPC_FEATURE_POWER5)
+    hwcap |= PPC_FEATURE_POWER4;
+
+#ifdef SHARED
+  /* Support sysdeps/powerpc/powerpc64/multiarch/memcpy.c.  */
+  IFUNC_IMPL (i, name, memcpy,
+	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_HAS_VSX,
+			      __memcpy_power7)
+	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_ARCH_2_06,
+			      __memcpy_a2)
+	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_ARCH_2_05,
+			      __memcpy_power6)
+	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_CELL_BE,
+			      __memcpy_cell)
+	      IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_POWER4,
+			      __memcpy_power4)
+	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_ppc))
+#endif
+
+  return i;
+}
diff --git a/sysdeps/powerpc/powerpc64/multiarch/init-arch.h b/sysdeps/powerpc/powerpc64/multiarch/init-arch.h
new file mode 100644
index 0000000..b7d238c
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/init-arch.h
@@ -0,0 +1,18 @@
+/* This file is part of the GNU C Library.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-a2.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-a2.S
new file mode 100644
index 0000000..7979673
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-a2.S
@@ -0,0 +1,40 @@
+/* Optimized memcpy implementation for PowerPC A2.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__memcpy_a2)						\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__memcpy_a2):					\
+  cfi_startproc;						\
+  LOCALENTRY(__memcpy_a2)
+
+#undef END_GEN_TB
+#define END_GEN_TB(name, mask)					\
+  cfi_endproc;							\
+  TRACEBACK_MASK(__memcpy_a2,mask)				\
+  END_2(__memcpy_a2)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/a2/memcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-cell.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-cell.S
new file mode 100644
index 0000000..7b3c102
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-cell.S
@@ -0,0 +1,40 @@
+/* Optimized memcpy implementation for PowerPC/CELL.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__memcpy_cell)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__memcpy_cell):					\
+  cfi_startproc;						\
+  LOCALENTRY(__memcpy_cell)
+
+#undef END_GEN_TB
+#define END_GEN_TB(name, mask)					\
+  cfi_endproc;							\
+  TRACEBACK_MASK(__memcpy_cell,mask)				\
+  END_2(__memcpy_cell)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/cell/memcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-power4.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power4.S
new file mode 100644
index 0000000..295a1f2
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power4.S
@@ -0,0 +1,40 @@
+/* Optimized memcpy implementation for PowerPC64/POWER4.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__memcpy_power4)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__memcpy_power4):					\
+  cfi_startproc;						\
+  LOCALENTRY(__memcpy_power4)
+
+#undef END_GEN_TB
+#define END_GEN_TB(name, mask)					\
+  cfi_endproc;							\
+  TRACEBACK_MASK(__memcpy_power4,mask)				\
+  END_2(__memcpy_power4)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power4/memcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-power6.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power6.S
new file mode 100644
index 0000000..136da78
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power6.S
@@ -0,0 +1,40 @@
+/* Optimized memcpy implementation for PowerPC/POWER6.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__memcpy_power6)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__memcpy_power6):					\
+  cfi_startproc;						\ 
+  LOCALENTRY(__memcpy_power6)
+
+#undef END_GEN_TB
+#define END_GEN_TB(name, mask)					\
+  cfi_endproc;							\
+  TRACEBACK_MASK(__memcpy_power6,mask)				\
+  END_2(__memcpy_power6)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power6/memcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-power7.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power7.S
new file mode 100644
index 0000000..aa725d2
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power7.S
@@ -0,0 +1,40 @@
+/* Optimized memcpy implementation for PowerPC/POWER7.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__memcpy_power7)					\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__memcpy_power7):					\
+  cfi_startproc;						\
+  LOCALENTRY(__memcpy_power7)
+
+#undef END_GEN_TB
+#define END_GEN_TB(name, mask)					\
+  cfi_endproc;							\
+  TRACEBACK_MASK(__memcpy_power7,mask)				\
+  END_2(__memcpy_power7)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power7/memcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-ppc64.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-ppc64.S
new file mode 100644
index 0000000..c8b70a0
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-ppc64.S
@@ -0,0 +1,43 @@
+/* Default memcpy implementation for PowerPC64.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#if defined SHARED && !defined NOT_IN_libc
+# undef EALIGN
+# define EALIGN(name, alignt, words)				\
+  .section ".text";						\
+  ENTRY_2(__memcpy_ppc)						\
+  .align ALIGNARG(alignt);					\
+  EALIGN_W_##words;						\
+  BODY_LABEL(__memcpy_ppc):					\
+  cfi_startproc;						\
+  LOCALENTRY(__memcpy_ppc)
+
+# undef END_GEN_TB
+# define END_GEN_TB(name, mask)					\
+   cfi_endproc;							\
+   TRACEBACK_MASK(__memcpy_ppc,mask)				\
+   END_2(__memcpy_ppc)
+
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name)				\
+   .globl __GI_memcpy; __GI_memcpy = __memcpy_ppc
+#endif
+
+#include <sysdeps/powerpc/powerpc64/memcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy.c b/sysdeps/powerpc/powerpc64/multiarch/memcpy.c
new file mode 100644
index 0000000..b580ef7
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy.c
@@ -0,0 +1,48 @@
+/* Multiple versions of memcpy. PowerPC64 version.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in lib and for
+   DSO.  In static binaries we need memcpy before the initialization
+   happened.  */
+#if defined SHARED && !defined NOT_IN_libc
+# include <string.h>
+# include <shlib-compat.h>
+# include "init-arch.h"
+
+extern __typeof (memcpy) __memcpy_ppc attribute_hidden;
+extern __typeof (memcpy) __memcpy_power4 attribute_hidden;
+extern __typeof (memcpy) __memcpy_cell attribute_hidden;
+extern __typeof (memcpy) __memcpy_power6 attribute_hidden;
+extern __typeof (memcpy) __memcpy_a2 attribute_hidden;
+extern __typeof (memcpy) __memcpy_power7 attribute_hidden;
+
+/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
+   ifunc symbol properly.  */
+libc_ifunc (memcpy,
+            (hwcap & PPC_FEATURE_HAS_VSX)
+            ? __memcpy_power7 :
+	      (hwcap & PPC_FEATURE_ARCH_2_06)
+	      ? __memcpy_a2 :
+		(hwcap & PPC_FEATURE_ARCH_2_05)
+		? __memcpy_power6 :
+		  (hwcap & PPC_FEATURE_CELL_BE)
+		  ? __memcpy_cell :
+		    (hwcap & PPC_FEATURE_POWER4)
+		    ? __memcpy_power4
+            : __memcpy_ppc);
+#endif
Follow-Ups:
- Re: [PATCH 02/21] PowerPC: multiarch memcpy for PowerPC64
  - From: Steven Munroe
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