File falkor-memcpy-memmove.patch of Package glibc.10668

2017-10-10  Siddhesh Poyarekar  <siddhesh@sourceware.org>

	* sysdeps/aarch64/multiarch/Makefile (sysdep_routines): Add
	memmove_falkor.
	* sysdeps/aarch64/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Likewise.
	* sysdeps/aarch64/multiarch/memmove.c: Likewise.
	* sysdeps/aarch64/multiarch/memmove_falkor.S: New file.

	* benchtests/bench-memmove-walk.c: New file.
	* benchtests/Makefile (string-benchset): Add it.

	* benchtests/bench-memset-walk.c: New file.
	* benchtests/Makefile (string-benchset): Add it.

	* benchtests/bench-memcpy-walk.c: New file.
	* benchtests/Makefile (string-benchset): Add it.

2017-10-10  Siddhesh Poyarekar  <siddhesh@sourceware.org>

	* manual/tunables.texi (Tunable glibc.tune.cpu): Add falkor.
	* sysdeps/aarch64/multiarch/Makefile (sysdep_routines): Add
	memcpy_falkor.
	* sysdeps/aarch64/multiarch/ifunc-impl-list.c (MAX_IFUNC):
	Bump.
	(__libc_ifunc_impl_list): Add __memcpy_falkor.
	* sysdeps/aarch64/multiarch/memcpy.c: Likewise.
	* sysdeps/aarch64/multiarch/memcpy_falkor.S: New file.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.c (cpu_list):
	Add falkor.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_FALKOR):
	New macro.

Index: glibc-2.26/manual/tunables.texi
===================================================================
--- glibc-2.26.orig/manual/tunables.texi
+++ glibc-2.26/manual/tunables.texi
@@ -267,7 +267,7 @@ This tunable is specific to i386 and x86
 @deftp Tunable glibc.tune.cpu
 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{thunderxt88}.
+@code{generic}, @code{falkor}, @code{thunderxt88}.
 
 This tunable is specific to aarch64.
 @end deftp
Index: glibc-2.26/sysdeps/aarch64/multiarch/Makefile
===================================================================
--- glibc-2.26.orig/sysdeps/aarch64/multiarch/Makefile
+++ glibc-2.26/sysdeps/aarch64/multiarch/Makefile
@@ -1,3 +1,4 @@
 ifeq ($(subdir),string)
-sysdep_routines += memcpy_generic memcpy_thunderx
+sysdep_routines += memcpy_generic memcpy_thunderx memcpy_falkor \
+		   memmove_falkor
 endif
Index: glibc-2.26/sysdeps/aarch64/multiarch/ifunc-impl-list.c
===================================================================
--- glibc-2.26.orig/sysdeps/aarch64/multiarch/ifunc-impl-list.c
+++ glibc-2.26/sysdeps/aarch64/multiarch/ifunc-impl-list.c
@@ -25,7 +25,7 @@
 #include <stdio.h>
 
 /* Maximum number of IFUNC implementations.  */
-#define MAX_IFUNC	2
+#define MAX_IFUNC	3
 
 size_t
 __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
@@ -40,9 +40,11 @@ __libc_ifunc_impl_list (const char *name
   /* Support sysdeps/aarch64/multiarch/memcpy.c and memmove.c.  */
   IFUNC_IMPL (i, name, memcpy,
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_thunderx)
+	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_falkor)
 	      IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_generic))
   IFUNC_IMPL (i, name, memmove,
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_thunderx)
+	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_falkor)
 	      IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_generic))
 
   return i;
Index: glibc-2.26/sysdeps/aarch64/multiarch/memcpy.c
===================================================================
--- glibc-2.26.orig/sysdeps/aarch64/multiarch/memcpy.c
+++ glibc-2.26/sysdeps/aarch64/multiarch/memcpy.c
@@ -30,9 +30,14 @@ extern __typeof (__redirect_memcpy) __li
 
 extern __typeof (__redirect_memcpy) __memcpy_generic attribute_hidden;
 extern __typeof (__redirect_memcpy) __memcpy_thunderx attribute_hidden;
+extern __typeof (__redirect_memcpy) __memcpy_falkor attribute_hidden;
 
 libc_ifunc (__libc_memcpy,
-            IS_THUNDERX (midr) ? __memcpy_thunderx : __memcpy_generic);
+            (IS_THUNDERX (midr)
+	     ? __memcpy_thunderx
+	     : (IS_FALKOR (midr)
+		? __memcpy_falkor
+		: __memcpy_generic)));
 
 # undef memcpy
 strong_alias (__libc_memcpy, memcpy);
Index: glibc-2.26/sysdeps/aarch64/multiarch/memcpy_falkor.S
===================================================================
--- /dev/null
+++ glibc-2.26/sysdeps/aarch64/multiarch/memcpy_falkor.S
@@ -0,0 +1,184 @@
+/* Optimized memcpy for Qualcomm Falkor processor.
+   Copyright (C) 2017 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>
+
+/* Assumptions:
+
+   ARMv8-a, AArch64, falkor, unaligned accesses.  */
+
+#define dstin	x0
+#define src	x1
+#define count	x2
+#define dst	x3
+#define srcend	x4
+#define dstend	x5
+#define A_l	x6
+#define A_lw	w6
+#define A_h	x7
+#define A_hw	w7
+#define tmp1	x14
+
+/* Copies are split into 3 main cases:
+
+   1. Small copies of up to 32 bytes
+   2. Medium copies of 33..128 bytes which are fully unrolled
+   3. Large copies of more than 128 bytes.
+
+   Large copies align the sourceto a quad word and use an unrolled loop
+   processing 64 bytes per iteration.
+
+   FALKOR-SPECIFIC DESIGN:
+
+   The smallest copies (32 bytes or less) focus on optimal pipeline usage,
+   which is why the redundant copies of 0-3 bytes have been replaced with
+   conditionals, since the former would unnecessarily break across multiple
+   issue groups.  The medium copy group has been enlarged to 128 bytes since
+   bumping up the small copies up to 32 bytes allows us to do that without
+   cost and also allows us to reduce the size of the prep code before loop64.
+
+   All copies are done only via two registers r6 and r7.  This is to ensure
+   that all loads hit a single hardware prefetcher which can get correctly
+   trained to prefetch a single stream.
+
+   The non-temporal stores help optimize cache utilization.  */
+
+#if IS_IN (libc)
+ENTRY_ALIGN (__memcpy_falkor, 6)
+
+	cmp	count, 32
+	add	srcend, src, count
+	add	dstend, dstin, count
+	b.ls	L(copy32)
+	ldp	A_l, A_h, [src]
+	cmp	count, 128
+	stp	A_l, A_h, [dstin]
+	b.hi	L(copy_long)
+
+	/* Medium copies: 33..128 bytes.  */
+	sub	tmp1, count, 1
+	ldp	A_l, A_h, [src, 16]
+	stp	A_l, A_h, [dstin, 16]
+	tbz	tmp1, 6, 1f
+	ldp	A_l, A_h, [src, 32]
+	stp	A_l, A_h, [dstin, 32]
+	ldp	A_l, A_h, [src, 48]
+	stp	A_l, A_h, [dstin, 48]
+	ldp	A_l, A_h, [srcend, -64]
+	stp	A_l, A_h, [dstend, -64]
+	ldp	A_l, A_h, [srcend, -48]
+	stp	A_l, A_h, [dstend, -48]
+1:
+	ldp	A_l, A_h, [srcend, -32]
+	stp	A_l, A_h, [dstend, -32]
+	ldp	A_l, A_h, [srcend, -16]
+	stp	A_l, A_h, [dstend, -16]
+	ret
+
+	.p2align 4
+	/* Small copies: 0..32 bytes.  */
+L(copy32):
+	/* 16-32 */
+	cmp	count, 16
+	b.lo	1f
+	ldp	A_l, A_h, [src]
+	stp	A_l, A_h, [dstin]
+	ldp	A_l, A_h, [srcend, -16]
+	stp	A_l, A_h, [dstend, -16]
+	ret
+	.p2align 4
+1:
+	/* 8-15 */
+	tbz	count, 3, 1f
+	ldr	A_l, [src]
+	str	A_l, [dstin]
+	ldr	A_l, [srcend, -8]
+	str	A_l, [dstend, -8]
+	ret
+	.p2align 4
+1:
+	/* 4-7 */
+	tbz	count, 2, 1f
+	ldr	A_lw, [src]
+	str	A_lw, [dstin]
+	ldr	A_lw, [srcend, -4]
+	str	A_lw, [dstend, -4]
+	ret
+	.p2align 4
+1:
+	/* 2-3 */
+	tbz	count, 1, 1f
+	ldrh	A_lw, [src]
+	strh	A_lw, [dstin]
+	ldrh	A_lw, [srcend, -2]
+	strh	A_lw, [dstend, -2]
+	ret
+	.p2align 4
+1:
+	/* 0-1 */
+	tbz	count, 0, 1f
+	ldrb	A_lw, [src]
+	strb	A_lw, [dstin]
+1:
+	ret
+
+	/* Align SRC to 16 bytes and copy; that way at least one of the
+	   accesses is aligned throughout the copy sequence.
+
+	   The count is off by 0 to 15 bytes, but this is OK because we trim
+	   off the last 64 bytes to copy off from the end.  Due to this the
+	   loop never runs out of bounds.  */
+	.p2align 6
+L(copy_long):
+	sub	count, count, 64 + 16
+	and	tmp1, src, 15
+	bic	src, src, 15
+	sub	dst, dstin, tmp1
+	add	count, count, tmp1
+
+L(loop64):
+	ldp	A_l, A_h, [src, 16]!
+	stnp	A_l, A_h, [dst, 16]
+	ldp	A_l, A_h, [src, 16]!
+	subs	count, count, 64
+	stnp	A_l, A_h, [dst, 32]
+	ldp	A_l, A_h, [src, 16]!
+	stnp	A_l, A_h, [dst, 48]
+	ldp	A_l, A_h, [src, 16]!
+	stnp	A_l, A_h, [dst, 64]
+	add	dst, dst, 64
+	b.hi	L(loop64)
+
+	/* Write the last full set of 64 bytes.  The remainder is at most 64
+	   bytes, so it is safe to always copy 64 bytes from the end even if
+	   there is just 1 byte left.  */
+L(last64):
+	ldp	A_l, A_h, [srcend, -64]
+	stnp	A_l, A_h, [dstend, -64]
+	ldp	A_l, A_h, [srcend, -48]
+	stnp	A_l, A_h, [dstend, -48]
+	ldp	A_l, A_h, [srcend, -32]
+	stnp	A_l, A_h, [dstend, -32]
+	ldp	A_l, A_h, [srcend, -16]
+	stnp	A_l, A_h, [dstend, -16]
+	ret
+
+END (__memcpy_falkor)
+libc_hidden_builtin_def (__memcpy_falkor)
+#endif
Index: glibc-2.26/sysdeps/aarch64/multiarch/memmove.c
===================================================================
--- glibc-2.26.orig/sysdeps/aarch64/multiarch/memmove.c
+++ glibc-2.26/sysdeps/aarch64/multiarch/memmove.c
@@ -30,9 +30,14 @@ extern __typeof (__redirect_memmove) __l
 
 extern __typeof (__redirect_memmove) __memmove_generic attribute_hidden;
 extern __typeof (__redirect_memmove) __memmove_thunderx attribute_hidden;
+extern __typeof (__redirect_memmove) __memmove_falkor attribute_hidden;
 
 libc_ifunc (__libc_memmove,
-            IS_THUNDERX (midr) ? __memmove_thunderx : __memmove_generic);
+            (IS_THUNDERX (midr)
+	     ? __memmove_thunderx
+	     : (IS_FALKOR (midr)
+		? __memmove_falkor
+		: __memmove_generic)));
 
 # undef memmove
 strong_alias (__libc_memmove, memmove);
Index: glibc-2.26/sysdeps/aarch64/multiarch/memmove_falkor.S
===================================================================
--- /dev/null
+++ glibc-2.26/sysdeps/aarch64/multiarch/memmove_falkor.S
@@ -0,0 +1,232 @@
+/* Copyright (C) 2017 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>
+
+/* Assumptions: ARMv8-a, AArch64, falkor, unaligned accesses.  */
+
+#define dstin	x0
+#define src	x1
+#define count	x2
+#define dstlen	x3
+#define dst	x3
+#define srcend	x4
+#define dstend	x5
+#define A_l	x6
+#define A_lw	w6
+#define A_h	x7
+#define A_hw	w7
+#define B_l	x8
+#define B_lw	w8
+#define B_h	x9
+#define C_l	x10
+#define C_h	x11
+#define D_l	x12
+#define D_h	x13
+#define E_l	src
+#define E_h	count
+#define F_l	srcend
+#define F_h	dst
+#define tmp1	x14
+
+/* Alias with A_l and A_h to train the prefetcher.  */
+#define Q_l	x22
+#define Q_h	x23
+
+/* RATIONALE:
+
+   The copy has 4 distinct parts:
+   * Small copies of 16 bytes and under
+   * Medium sized copies of 17-96 bytes
+   * Large copies where the source address is higher than the destination
+     (forward copies)
+   * Large copies where the destination address is higher than the source
+     (copy backward, or move).
+
+   We use only two registerpairs x6,x7 and x22,x23 for the copies and copy 32
+   bytes at a time to correctly train the hardware prefetcher for better
+   throughput.  */
+ENTRY_ALIGN (__memmove_falkor, 6)
+
+	sub	tmp1, dstin, src
+	add	srcend, src, count
+	add	dstend, dstin, count
+	cmp	count, 96
+	ccmp	tmp1, count, 2, hi
+	b.lo	L(move_long)
+
+	cmp	count, 16
+	b.ls	L(copy16)
+	cmp	count, 96
+	b.hi	L(copy_long)
+
+	/* Medium copies: 17..96 bytes.  */
+	sub	tmp1, count, 1
+	ldp	A_l, A_h, [src]
+	tbnz	tmp1, 6, L(copy96)
+	ldp	D_l, D_h, [srcend, -16]
+	tbz	tmp1, 5, 1f
+	ldp	B_l, B_h, [src, 16]
+	ldp	C_l, C_h, [srcend, -32]
+	stp	B_l, B_h, [dstin, 16]
+	stp	C_l, C_h, [dstend, -32]
+1:
+	stp	A_l, A_h, [dstin]
+	stp	D_l, D_h, [dstend, -16]
+	ret
+
+	.p2align 4
+	/* Small copies: 0..16 bytes.  */
+L(copy16):
+	cmp	count, 8
+	b.lo	1f
+	ldr	A_l, [src]
+	ldr	A_h, [srcend, -8]
+	str	A_l, [dstin]
+	str	A_h, [dstend, -8]
+	ret
+	.p2align 4
+1:
+	/* 4-7 */
+	tbz	count, 2, 1f
+	ldr	A_lw, [src]
+	ldr	A_hw, [srcend, -4]
+	str	A_lw, [dstin]
+	str	A_hw, [dstend, -4]
+	ret
+	.p2align 4
+1:
+	/* 2-3 */
+	tbz	count, 1, 1f
+	ldrh	A_lw, [src]
+	ldrh	A_hw, [srcend, -2]
+	strh	A_lw, [dstin]
+	strh	A_hw, [dstend, -2]
+	ret
+	.p2align 4
+1:
+	/* 0-1 */
+	tbz	count, 0, 1f
+	ldrb	A_lw, [src]
+	strb	A_lw, [dstin]
+1:	ret
+
+	.p2align 4
+	/* Copy 64..96 bytes.  Copy 64 bytes from the start and
+	   32 bytes from the end.  */
+L(copy96):
+	ldp	B_l, B_h, [src, 16]
+	ldp	C_l, C_h, [src, 32]
+	ldp	D_l, D_h, [src, 48]
+	ldp	E_l, E_h, [srcend, -32]
+	ldp	F_l, F_h, [srcend, -16]
+	stp	A_l, A_h, [dstin]
+	stp	B_l, B_h, [dstin, 16]
+	stp	C_l, C_h, [dstin, 32]
+	stp	D_l, D_h, [dstin, 48]
+	stp	E_l, E_h, [dstend, -32]
+	stp	F_l, F_h, [dstend, -16]
+	ret
+
+	/* Align SRC to 16 byte alignment so that we don't cross cache line
+	   boundaries on both loads and stores.  There are at least 96 bytes
+	   to copy, so copy 16 bytes unaligned and then align.  The loop
+	   copies 32 bytes per iteration and prefetches one iteration ahead.  */
+
+	.p2align 4
+L(copy_long):
+	sub	count, count, 64 + 16	/* Test and readjust count.  */
+	mov	B_l, Q_l
+	mov	B_h, Q_h
+	ldp	A_l, A_h, [src]
+	and	tmp1, src, 15
+	bic	src, src, 15
+	sub	dst, dstin, tmp1
+	add	count, count, tmp1	/* Count is now 16 too large.  */
+	ldp	Q_l, Q_h, [src, 16]!
+	stp	A_l, A_h, [dstin]
+	ldp	A_l, A_h, [src, 16]!
+
+L(loop64):
+	subs	count, count, 32
+	stp	Q_l, Q_h, [dst, 16]
+	ldp	Q_l, Q_h, [src, 16]!
+	stp	A_l, A_h, [dst, 32]!
+	ldp	A_l, A_h, [src, 16]!
+	b.hi	L(loop64)
+
+	/* Write the last full set of 32 bytes.  The remainder is at most 32
+	   bytes, so it is safe to always copy 32 bytes from the end even if
+	   there is just 1 byte left.  */
+L(last64):
+	ldp	C_l, C_h, [srcend, -32]
+	stp	Q_l, Q_h, [dst, 16]
+	ldp	Q_l, Q_h, [srcend, -16]
+	stp	A_l, A_h, [dst, 32]
+	stp	C_l, C_h, [dstend, -32]
+	stp	Q_l, Q_h, [dstend, -16]
+	mov	Q_l, B_l
+	mov	Q_h, B_h
+	ret
+
+	.p2align 4
+L(move_long):
+	cbz	tmp1, 3f
+
+	mov	B_l, Q_l
+	mov	B_h, Q_h
+
+	/* Align SRCEND to 16 byte alignment so that we don't cross cache line
+	   boundaries on both loads and stores.  There are at least 96 bytes
+	   to copy, so copy 16 bytes unaligned and then align.  The loop
+	   copies 32 bytes per iteration and prefetches one iteration ahead.  */
+
+	ldp	A_l, A_h, [srcend, -16]
+	and	tmp1, srcend, 15
+	sub	srcend, srcend, tmp1
+	ldp	Q_l, Q_h, [srcend, -16]!
+	stp	A_l, A_h, [dstend, -16]
+	sub	count, count, tmp1
+	ldp	A_l, A_h, [srcend, -16]!
+	sub	dstend, dstend, tmp1
+	sub	count, count, 64
+
+1:
+	subs	count, count, 32
+	stp	Q_l, Q_h, [dstend, -16]
+	ldp	Q_l, Q_h, [srcend, -16]!
+	stp	A_l, A_h, [dstend, -32]!
+	ldp	A_l, A_h, [srcend, -16]!
+	b.hi	1b
+
+	/* Write the last full set of 32 bytes.  The remainder is at most 32
+	   bytes, so it is safe to always copy 32 bytes from the start even if
+	   there is just 1 byte left.  */
+2:
+	ldp	C_l, C_h, [src, 16]
+	stp	Q_l, Q_h, [dstend, -16]
+	ldp	Q_l, Q_h, [src]
+	stp	A_l, A_h, [dstend, -32]
+	stp	C_l, C_h, [dstin, 16]
+	stp	Q_l, Q_h, [dstin]
+	mov	Q_l, B_l
+	mov	Q_h, B_h
+3:	ret
+
+END (__memmove_falkor)
+libc_hidden_builtin_def (__memmove_falkor)
Index: glibc-2.26/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
===================================================================
--- glibc-2.26.orig/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ glibc-2.26/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -28,6 +28,7 @@ struct cpu_list
 };
 
 static struct cpu_list cpu_list[] = {
+      {"falkor",	0x510FC000},
       {"thunderxt88",	0x430F0A10},
       {"generic", 	0x0}
 };
Index: glibc-2.26/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
===================================================================
--- glibc-2.26.orig/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
+++ glibc-2.26/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
@@ -41,6 +41,9 @@
 #define IS_THUNDERX(midr) (MIDR_IMPLEMENTOR(midr) == 'C'	\
 			   && MIDR_PARTNUM(midr) == 0x0a1)
 
+#define IS_FALKOR(midr) (MIDR_IMPLEMENTOR(midr) == 'Q'			      \
+                        && MIDR_PARTNUM(midr) == 0xc00)
+
 struct cpu_features
 {
   uint64_t midr_el1;
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