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, 159 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/s390/multiarch/memchr-vx.S b/REORG.TODO/sysdeps/s390/multiarch/memchr-vx.S
new file mode 100644
index 0000000000..e9cb06f948
--- /dev/null
+++ b/REORG.TODO/sysdeps/s390/multiarch/memchr-vx.S
@@ -0,0 +1,159 @@
+/* Vector optimized 32/64 bit S/390 version of memchr.
+   Copyright (C) 2015-2017 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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+
+# include "sysdep.h"
+# include "asm-syntax.h"
+
+	.text
+
+/* void *memchr (const void *s, int c, size_t n)
+   Scans memory for character c
+   and returns pointer to first c.
+
+   Register usage:
+   -r0=tmp
+   -r1=tmp
+   -r2=s
+   -r3=c
+   -r4=n
+   -r5=current_len
+   -v16=part of s
+   -v17=index of found c
+   -v18=c replicated
+*/
+ENTRY(__memchr_vx)
+
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+	llgfr	%r4,%r4
+# endif /* !defined __s390x__ */
+
+	clgije	%r4,0,.Lnf_end	/* If len == 0 then exit.  */
+
+	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r0,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
+	llgfr	%r0,%r0		/* Convert 32bit to 64bit.  */
+
+	vlvgb	%v18,%r3,0	/* Generate vector which elements are all c.
+				   if c > 255, c will be truncated.  */
+	vrepb	%v18,%v18,0
+	lghi	%r5,16		/* current_len = 16.  */
+
+	clgrjhe	%r0,%r4,.Llastcmp /* If (bytes to boundary) >= n,
+				     jump to lastcmp.  */
+
+	vfeebs	%v17,%v16,%v18	/* Find c.  */
+	vlgvb	%r1,%v17,7	/* Load byte index of c.  */
+	clgrjl	%r1,%r0,.Lfound2 /* Found c is within loaded bytes.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	slr	%r5,%r1		/* Compute bytes to 16bytes boundary.  */
+
+	lgr	%r0,%r5		/* If %r5 + 64 < n? -> loop64.  */
+	aghi	%r0,64
+	clgrjl	%r0,%r4,.Lloop64
+.Llt64:
+	vl	%v16,0(%r5,%r2)
+	aghi	%r5,16
+	clgrjhe	%r5,%r4,.Llastcmp /* Do last compare if curr-len >= n.  */
+	vfeebs	%v17,%v16,%v18	/* Find c.  */
+	jl	.Lfound	/* Jump away if c was found.  */
+
+	vl	%v16,0(%r5,%r2)
+	aghi	%r5,16
+	clgrjhe	%r5,%r4,.Llastcmp
+	vfeebs	%v17,%v16,%v18
+	jl	.Lfound
+
+	vl	%v16,0(%r5,%r2)
+	aghi	%r5,16
+	clgrjhe	%r5,%r4,.Llastcmp
+	vfeebs	%v17,%v16,%v18
+	jl	.Lfound
+
+	vl	%v16,0(%r5,%r2)
+	aghi	%r5,16
+
+.Llastcmp:
+	/* Use comparision result only if located within first n characters.
+	   %r5: current_len;
+	   %r4: n;
+	   (current_len - n): [0...16[
+	   first ignored match index: vr-width - (current_len - n) ]0...16]
+	*/
+	vfeebs	%v17,%v16,%v18	/* Find c.  */
+	slgrk	%r4,%r5,%r4	/* %r5 = current_len - n.  */
+	lghi	%r0,16		/* Register width = 16.  */
+	vlgvb	%r1,%v17,7	/* Extract found index or 16 if all equal.  */
+	slr	%r0,%r4		/* %r0 = first ignored match index.  */
+	clrjl	%r1,%r0,.Lfound2 /* Go away if miscompare is below n bytes.  */
+	/* c not found within n-bytes.  */
+.Lnf_end:
+	lghi	%r2,0		/* Return null.  */
+	br	%r14
+
+.Lfound48:
+	aghi	%r5,16
+.Lfound32:
+	aghi	%r5,16
+.Lfound16:
+	aghi	%r5,16
+.Lfound0:
+	aghi	%r5,16
+.Lfound:
+	vlgvb	%r1,%v17,7	/* Load byte index of c.  */
+.Lfound2:
+	slgfi	%r5,16		/* current_len -=16 */
+	algr	%r5,%r1		/* Zero byte index is added to current len.  */
+	la	%r2,0(%r5,%r2)	/* Return pointer to c.  */
+	br	%r14
+
+
+.Lloop64:
+	vl	%v16,0(%r5,%r2)
+	vfeebs	%v17,%v16,%v18	/* Find c.  */
+	jl	.Lfound0	/* Jump away if c was found.  */
+	vl	%v16,16(%r5,%r2)
+	vfeebs	%v17,%v16,%v18
+	jl	.Lfound16
+	vl	%v16,32(%r5,%r2)
+	vfeebs	%v17,%v16,%v18
+	jl	.Lfound32
+	vl	%v16,48(%r5,%r2)
+	vfeebs	%v17,%v16,%v18
+	jl	.Lfound48
+
+	aghi	%r5,64
+	lgr	%r0,%r5		/* If %r5 + 64 < n? -> loop64.  */
+	aghi	%r0,64
+	clgrjl	%r0,%r4,.Lloop64
+
+	j	.Llt64
+END(__memchr_vx)
+
+# define memchr __memchr_c
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name) strong_alias(__memchr_c, __GI_memchr)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+
+#include <memchr.S>