Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 472 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/powerpc/powerpc64/power7/mempcpy.S b/REORG.TODO/sysdeps/powerpc/powerpc64/power7/mempcpy.S
new file mode 100644
index 0000000000..4e15d1e40c
--- /dev/null
+++ b/REORG.TODO/sysdeps/powerpc/powerpc64/power7/mempcpy.S
@@ -0,0 +1,472 @@
+/* Optimized mempcpy implementation for POWER7.
+   Copyright (C) 2010-2017 Free Software Foundation, Inc.
+   Contributed by Luis Machado <luisgpm@br.ibm.com>.
+   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>
+
+
+/* __ptr_t [r3] __mempcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]);
+    Returns 'dst' + 'len'.  */
+
+#ifndef MEMPCPY
+# define MEMPCPY __mempcpy
+#endif
+	.machine  power7
+EALIGN (MEMPCPY, 5, 0)
+	CALL_MCOUNT 3
+
+	cmpldi	cr1,5,31
+	neg	0,3
+	std	3,-16(1)
+	std	31,-8(1)
+	cfi_offset(31,-8)
+	ble	cr1,L(copy_LT_32)   /* If move < 32 bytes use short move
+				       code.  */
+
+	andi.	11,3,7	      /* Check alignment of DST.  */
+
+
+	clrldi	10,4,61	      /* Check alignment of SRC.  */
+	cmpld	cr6,10,11     /* SRC and DST alignments match?  */
+	mr	12,4
+	mr	31,5
+	bne	cr6,L(copy_GE_32_unaligned)
+
+	srdi	9,5,3	      /* Number of full quadwords remaining.  */
+
+	beq	L(copy_GE_32_aligned_cont)
+
+	clrldi	0,0,61
+	mtcrf	0x01,0
+	subf	31,0,5
+
+	/* Get the SRC aligned to 8 bytes.  */
+
+1:	bf	31,2f
+	lbz	6,0(12)
+	addi	12,12,1
+	stb	6,0(3)
+	addi	3,3,1
+2:	bf	30,4f
+	lhz	6,0(12)
+	addi	12,12,2
+	sth	6,0(3)
+	addi	3,3,2
+4:	bf	29,0f
+	lwz	6,0(12)
+	addi	12,12,4
+	stw	6,0(3)
+	addi	3,3,4
+0:
+	clrldi	10,12,61      /* Check alignment of SRC again.  */
+	srdi	9,31,3	      /* Number of full doublewords remaining.  */
+
+L(copy_GE_32_aligned_cont):
+
+	clrldi	11,31,61
+	mtcrf	0x01,9
+
+	srdi	8,31,5
+	cmpldi	cr1,9,4
+	cmpldi	cr6,11,0
+	mr	11,12
+
+	/* Copy 1~3 doublewords so the main loop starts
+	at a multiple of 32 bytes.  */
+
+	bf	30,1f
+	ld	6,0(12)
+	ld	7,8(12)
+	addi	11,12,16
+	mtctr	8
+	std	6,0(3)
+	std	7,8(3)
+	addi	10,3,16
+	bf	31,4f
+	ld	0,16(12)
+	std	0,16(3)
+	blt	cr1,3f
+	addi	11,12,24
+	addi	10,3,24
+	b	4f
+
+	.align	4
+1:	/* Copy 1 doubleword and set the counter.  */
+	mr	10,3
+	mtctr	8
+	bf	31,4f
+	ld	6,0(12)
+	addi	11,12,8
+	std	6,0(3)
+	addi	10,3,8
+
+	/* Main aligned copy loop. Copies 32-bytes at a time.  */
+	.align	4
+4:
+	ld	6,0(11)
+	ld	7,8(11)
+	ld	8,16(11)
+	ld	0,24(11)
+	addi	11,11,32
+
+	std	6,0(10)
+	std	7,8(10)
+	std	8,16(10)
+	std	0,24(10)
+	addi	10,10,32
+	bdnz	4b
+3:
+
+	/* Check for tail bytes.  */
+	rldicr	0,31,0,60
+	mtcrf	0x01,31
+	beq	cr6,0f
+
+.L9:
+	add	3,3,0
+	add	12,12,0
+
+	/*  At this point we have a tail of 0-7 bytes and we know that the
+	destination is doubleword-aligned.  */
+4:	/* Copy 4 bytes.  */
+	bf	29,2f
+
+	lwz	6,0(12)
+	addi	12,12,4
+	stw	6,0(3)
+	addi	3,3,4
+2:	/* Copy 2 bytes.  */
+	bf	30,1f
+
+	lhz	6,0(12)
+	addi	12,12,2
+	sth	6,0(3)
+	addi	3,3,2
+1:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,0(12)
+	stb	6,0(3)
+0:	/* Return DST + LEN pointer.  */
+	ld	31,-8(1)
+	ld	3,-16(1)
+	add	3,3,5
+	blr
+
+	/* Handle copies of 0~31 bytes.  */
+	.align	4
+L(copy_LT_32):
+	cmpldi	cr6,5,8
+	mr	12,4
+	mtcrf	0x01,5
+	ble	cr6,L(copy_LE_8)
+
+	/* At least 9 bytes to go.  */
+	neg	8,4
+	clrrdi	11,4,2
+	andi.	0,8,3
+	cmpldi	cr1,5,16
+	mr	10,5
+	beq	L(copy_LT_32_aligned)
+
+	/* Force 4-bytes alignment for SRC.  */
+	mtocrf  0x01,0
+	subf	10,0,5
+2:	bf	30,1f
+
+	lhz	6,0(12)
+	addi	12,12,2
+	sth	6,0(3)
+	addi	3,3,2
+1:	bf	31,L(end_4bytes_alignment)
+
+	lbz	6,0(12)
+	addi	12,12,1
+	stb	6,0(3)
+	addi	3,3,1
+
+	.align	4
+L(end_4bytes_alignment):
+	cmpldi	cr1,10,16
+	mtcrf	0x01,10
+
+L(copy_LT_32_aligned):
+	/* At least 6 bytes to go, and SRC is word-aligned.  */
+	blt	cr1,8f
+
+	/* Copy 16 bytes.  */
+	lwz	6,0(12)
+	lwz	7,4(12)
+	stw	6,0(3)
+	lwz	8,8(12)
+	stw	7,4(3)
+	lwz	6,12(12)
+	addi	12,12,16
+	stw	8,8(3)
+	stw	6,12(3)
+	addi	3,3,16
+8:	/* Copy 8 bytes.  */
+	bf	28,4f
+
+	lwz	6,0(12)
+	lwz	7,4(12)
+	addi	12,12,8
+	stw	6,0(3)
+	stw	7,4(3)
+	addi	3,3,8
+4:	/* Copy 4 bytes.  */
+	bf	29,2f
+
+	lwz	6,0(12)
+	addi	12,12,4
+	stw	6,0(3)
+	addi	3,3,4
+2:	/* Copy 2-3 bytes.  */
+	bf	30,1f
+
+	lhz	6,0(12)
+	sth	6,0(3)
+	bf	31,0f
+	lbz	7,2(12)
+	stb	7,2(3)
+	ld	3,-16(1)
+	add	3,3,5
+	blr
+
+	.align	4
+1:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,0(12)
+	stb	6,0(3)
+0:	/* Return DST + LEN pointer.  */
+	ld	3,-16(1)
+	add	3,3,5
+	blr
+
+	/* Handles copies of 0~8 bytes.  */
+	.align	4
+L(copy_LE_8):
+	bne	cr6,4f
+
+	/* Though we could've used ld/std here, they are still
+	slow for unaligned cases.  */
+
+	lwz	6,0(4)
+	lwz	7,4(4)
+	stw	6,0(3)
+	stw	7,4(3)
+	ld	3,-16(1)      /* Return DST + LEN pointer.  */
+	add	3,3,5
+	blr
+
+	.align	4
+4:	/* Copies 4~7 bytes.  */
+	bf	29,2b
+
+	lwz	6,0(4)
+	stw	6,0(3)
+	bf	30,5f
+	lhz	7,4(4)
+	sth	7,4(3)
+	bf	31,0f
+	lbz	8,6(4)
+	stb	8,6(3)
+	ld	3,-16(1)
+	add	3,3,5
+	blr
+
+	.align	4
+5:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,4(4)
+	stb	6,4(3)
+
+0:	/* Return DST + LEN pointer.  */
+	ld	3,-16(1)
+	add	3,3,5
+	blr
+
+	/* Handle copies of 32+ bytes where DST is aligned (to quadword) but
+	SRC is not.  Use aligned quadword loads from SRC, shifted to realign
+	the data, allowing for aligned DST stores.  */
+	.align	4
+L(copy_GE_32_unaligned):
+	clrldi	0,0,60	      /* Number of bytes until the 1st
+				 quadword.  */
+	andi.	11,3,15	      /* Check alignment of DST (against
+				 quadwords).  */
+	srdi	9,5,4	      /* Number of full quadwords remaining.  */
+
+	beq	L(copy_GE_32_unaligned_cont)
+
+	/* SRC is not quadword aligned, get it aligned.  */
+
+	mtcrf	0x01,0
+	subf	31,0,5
+
+	/* Vector instructions work best when proper alignment (16-bytes)
+	is present.  Move 0~15 bytes as needed to get DST quadword-aligned.  */
+1:	/* Copy 1 byte.  */
+	bf	31,2f
+
+	lbz	6,0(12)
+	addi	12,12,1
+	stb	6,0(3)
+	addi	3,3,1
+2:	/* Copy 2 bytes.  */
+	bf	30,4f
+
+	lhz	6,0(12)
+	addi	12,12,2
+	sth	6,0(3)
+	addi	3,3,2
+4:	/* Copy 4 bytes.  */
+	bf	29,8f
+
+	lwz	6,0(12)
+	addi	12,12,4
+	stw	6,0(3)
+	addi	3,3,4
+8:	/* Copy 8 bytes.  */
+	bf	28,0f
+
+	ld	6,0(12)
+	addi	12,12,8
+	std	6,0(3)
+	addi	3,3,8
+0:
+	clrldi	10,12,60      /* Check alignment of SRC.  */
+	srdi	9,31,4	      /* Number of full quadwords remaining.  */
+
+	/* The proper alignment is present, it is OK to copy the bytes now.  */
+L(copy_GE_32_unaligned_cont):
+
+	/* Setup two indexes to speed up the indexed vector operations.  */
+	clrldi	11,31,60
+	li	6,16	      /* Index for 16-bytes offsets.  */
+	li	7,32	      /* Index for 32-bytes offsets.  */
+	cmpldi	cr1,11,0
+	srdi	8,31,5	      /* Setup the loop counter.  */
+	mr	10,3
+	mr	11,12
+	mtcrf	0x01,9
+	cmpldi	cr6,9,1
+#ifdef __LITTLE_ENDIAN__
+	lvsr    5,0,12
+#else
+	lvsl    5,0,12
+#endif
+	lvx	3,0,12
+	bf	31,L(setup_unaligned_loop)
+
+	/* Copy another 16 bytes to align to 32-bytes due to the loop .  */
+	lvx	4,12,6
+#ifdef __LITTLE_ENDIAN__
+	vperm   6,4,3,5
+#else
+	vperm   6,3,4,5
+#endif
+	addi	11,12,16
+	addi	10,3,16
+	stvx	6,0,3
+	vor	3,4,4
+
+L(setup_unaligned_loop):
+	mtctr	8
+	ble	cr6,L(end_unaligned_loop)
+
+	/* Copy 32 bytes at a time using vector instructions.  */
+	.align	4
+L(unaligned_loop):
+
+	/* Note: vr6/vr10 may contain data that was already copied,
+	but in order to get proper alignment, we may have to copy
+	some portions again. This is faster than having unaligned
+	vector instructions though.  */
+
+	lvx	4,11,6	      /* vr4 = r11+16.  */
+#ifdef __LITTLE_ENDIAN__
+	vperm   6,4,3,5
+#else
+	vperm   6,3,4,5
+#endif
+	lvx	3,11,7	      /* vr3 = r11+32.  */
+#ifdef __LITTLE_ENDIAN__
+	vperm   10,3,4,5
+#else
+	vperm   10,4,3,5
+#endif
+	addi	11,11,32
+	stvx	6,0,10
+	stvx	10,10,6
+	addi	10,10,32
+
+	bdnz	L(unaligned_loop)
+
+	.align	4
+L(end_unaligned_loop):
+
+	/* Check for tail bytes.  */
+	rldicr	0,31,0,59
+	mtcrf	0x01,31
+	beq	cr1,0f
+
+	add	3,3,0
+	add	12,12,0
+
+	/*  We have 1~15 tail bytes to copy, and DST is quadword aligned.  */
+8:	/* Copy 8 bytes.  */
+	bf	28,4f
+
+	lwz	6,0(12)
+	lwz	7,4(12)
+	addi	12,12,8
+	stw	6,0(3)
+	stw	7,4(3)
+	addi	3,3,8
+4:	/* Copy 4 bytes.  */
+	bf	29,2f
+
+	lwz	6,0(12)
+	addi	12,12,4
+	stw	6,0(3)
+	addi	3,3,4
+2:	/* Copy 2~3 bytes.  */
+	bf	30,1f
+
+	lhz	6,0(12)
+	addi	12,12,2
+	sth	6,0(3)
+	addi	3,3,2
+1:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,0(12)
+	stb	6,0(3)
+0:	/* Return DST + LEN pointer.  */
+	ld	31,-8(1)
+	ld	3,-16(1)
+	add	3,3,5
+	blr
+
+END_GEN_TB (MEMPCPY,TB_TOCLESS)
+libc_hidden_def (__mempcpy)
+weak_alias (__mempcpy, mempcpy)
+libc_hidden_builtin_def (mempcpy)