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, 265 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/s390/multiarch/wcsncat-vx.S b/REORG.TODO/sysdeps/s390/multiarch/wcsncat-vx.S
new file mode 100644
index 0000000000..5c49a1e499
--- /dev/null
+++ b/REORG.TODO/sysdeps/s390/multiarch/wcsncat-vx.S
@@ -0,0 +1,265 @@
+/* Vector optimized 32/64 bit S/390 version of wcsncat.
+   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
+
+/* wchar_t * wcsncat (wchar_t *dest, const wchar_t *src, size_t n)
+   Concatenate two strings - at most n characters of src.
+
+   Register usage:
+   -r0=saved dest pointer for return
+   -r1=tmp
+   -r2=dest
+   -r3=src
+   -r4=n
+   -r5=current_len
+   -r6=tmp
+   -r7=tmp
+   -v16=part of src
+   -v17=index of zero
+   -v18=part of src
+   -v31=register save area for r6, r7
+*/
+ENTRY(__wcsncat_vx)
+	.machine "z13"
+	.machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+	llgfr	%r4,%r4
+# endif /* !defined __s390x__ */
+
+	clgfi	%r4,0
+	ber	%r14		/* Nothing to do, if n == 0.  */
+
+	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
+
+	/* If either src or dest is not 4byte aligned, use __wcsncat_c.  */
+	tmll	%r2,3		/* Test if s is 4-byte aligned?   */
+	jne	.Lfallback	/* And use common-code variant if not.  */
+	tmll	%r3,3		/* Test if src is 4-byte aligned?   */
+	jne	.Lfallback	/* And use common-code variant if not.  */
+
+	lgr	%r0,%r2		/* Save destination pointer for return.  */
+	vlvgp	%v31,%r6,%r7	/* Save registers.  */
+
+	/* WCSLEN
+	   %r1 = loaded bytes (tmp)
+	   %r6 = zero byte index (tmp)
+	   %r2 = dst
+	*/
+	vfenezf	%v16,%v16,%v16	/* Find element not equal with zero search.  */
+	vlgvb	%r5,%v16,7	/* Load zero index or 16 if not found.  */
+	clrjl	%r5,%r1,.Llen_end /* Found zero within loaded bytes, end.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,16		/* current_len = 16.  */
+	slr	%r5,%r1		/* Compute bytes to 16bytes boundary.  */
+
+	/* Find zero in 16byte aligned loop.  */
+.Llen_loop:
+	vl	%v16,0(%r5,%r2)	/* Load s.  */
+	vfenezfs %v16,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Llen_found	/* Jump away if zero was found.  */
+	vl	%v16,16(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Llen_found16
+	vl	%v16,32(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Llen_found32
+	vl	%v16,48(%r5,%r2)
+	vfenezfs %v16,%v16,%v16
+	je	.Llen_found48
+
+	aghi	%r5,64
+	j	.Llen_loop	/* No zero -> loop.  */
+
+.Llen_found48:
+	aghi	%r5,16
+.Llen_found32:
+	aghi	%r5,16
+.Llen_found16:
+	aghi	%r5,16
+.Llen_found:
+	vlgvb	%r1,%v16,7	/* Load byte index of zero.  */
+	algr	%r5,%r1
+
+.Llen_end:
+	/* WCSNCPY
+	   %r1 = zero byte index (tmp)
+	   %r6 = loaded bytes (tmp)
+	   %r3 = curr src pointer
+	   %r2 = curr dst pointer
+	   %r7 = border, tmp
+	*/
+	la	%r2,0(%r5,%r2)	/* strcpy at end of dst-string.  */
+
+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
+	lcbb	%r6,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
+	llgfr	%r6,%r6		/* Convert 32bit to 64bit.  */
+
+	lghi	%r5,0		/* current_len = 0.  */
+
+	/* Check range of maxlen and convert to byte-count.  */
+# ifdef __s390x__
+	tmhh	%r4,49152	/* Test bit 0 or 1 of maxlen.  */
+	lghi	%r1,-4		/* Max byte-count is 18446744073709551612.  */
+# else
+	tmlh	%r4,49152	/* Test bit 0 or 1 of maxlen.  */
+	llilf	%r1,4294967292	/* Max byte-count is 4294967292.  */
+# endif /* !__s390x__ */
+	sllg	%r4,%r4,2	/* Convert character-count to byte-count.  */
+	locgrne	%r4,%r1		/* Use max byte-count, if bit 0/1 was one.  */
+
+	clgrjle	%r4,%r6,.Lcpy_remaining_v16 /* If n <= loaded-bytes
+					       -> process remaining.  */
+
+	/* n > loaded-byte-count.  */
+	vfenezf	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */
+	clrjl	%r1,%r6,.Lcpy_found_v16_store /* Found zero within loaded bytes,
+					         copy and return.  */
+
+	/* Align s to 16 byte.  */
+	risbgn	%r1,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
+	lghi	%r5,15		/* current_len = 15.  */
+	slr	%r5,%r1		/* Compute highest index to 16byte boundary.  *
+
+	/* Zero not found and maxlen > loaded-byte-count.  */
+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
+	ahi	%r5,1		/* Start loop at next character.  */
+
+	/*
+	  Now we are 16byte aligned, so we can load a full vreg
+	  without page fault.
+	 */
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r4,.Lcpy_loop64
+
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	clgijl	%r4,17,.Lcpy_remaining_v16 /* If n <=16,
+					       process remaining bytes.  */
+.Lcpy_lt64:
+	lgr	%r7,%r4
+	slgfi	%r7,16		/* border_len = n - 16.  */
+
+	clgrjhe	%r5,%r7,.Lcpy_remaining_v16
+	vfenezfs %v17,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lcpy_found_v16 /* Jump away if zero was found.  */
+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
+	vst	%v16,0(%r5,%r2)	/* Save previous part without zero to dst.  */
+	aghi	%r5,16
+
+	clgrjhe	%r5,%r7,.Lcpy_remaining_v18
+	vfenezfs %v17,%v18,%v18
+	je	.Lcpy_found_v18
+	vl	%v16,16(%r5,%r3)
+	vst	%v18,0(%r5,%r2)
+	aghi	%r5,16
+
+	clgrjhe	%r5,%r7,.Lcpy_remaining_v16
+	vfenezfs %v17,%v16,%v16
+	je	.Lcpy_found_v16
+	vl	%v18,16(%r5,%r3)
+	vst	%v16,0(%r5,%r2)
+	aghi	%r5,16
+
+.Lcpy_remaining_v18:
+	vlr	%v16,%v18
+.Lcpy_remaining_v16:
+	/* v16 contains the remaining bytes [1...16].
+	   Store remaining bytes and append string-termination.  */
+	vfenezf	%v17,%v16,%v16	/* Find element not equal with zero search.  */
+	slgrk	%r7,%r4,%r5	/* Remaining bytes = maxlen - current_len.  */
+	aghi	%r7,-1		/* vstl needs highest index.  */
+	vlgvb	%r1,%v17,7	/* Load zero index or 16 if not found.  */
+	la	%r2,0(%r5,%r2)	/* vstl has no index register.  */
+	/* Zero-index within remaining-bytes, store up to zero and end.  */
+	clgrjle	%r1,%r7,.Lcpy_found_v16_store
+	vstl	%v16,%r7,0(%r2)	/* Store remaining bytes.  */
+	lghi	%r1,0
+	st	%r1,1(%r7,%r2)	/* Store string-null-termination beyond n.  */
+.Lcpy_end:
+	/* Restore saved registers.  */
+	vlgvg	%r6,%v31,0
+	vlgvg	%r7,%v31,1
+	lgr	%r2,%r0		/* Load saved dest-ptr.  */
+	br	%r14
+
+.Lcpy_found_v16_32:
+	aghi	%r5,32
+	j	.Lcpy_found_v16
+.Lcpy_found_v18_48:
+	aghi	%r5,32
+.Lcpy_found_v18_16:
+	aghi	%r5,16
+.Lcpy_found_v18:
+	vlr	%v16,%v18
+.Lcpy_found_v16:
+	/* v16 contains a zero. Store remaining bytes to zero. current_len
+	   has not reached border, thus checking for n is not needed!  */
+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
+	la	%r2,0(%r5,%r2)
+.Lcpy_found_v16_store:
+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
+	vstl	%v16,%r1,0(%r2)	/* Copy characters including zero.  */
+	j	.Lcpy_end
+
+	/* Find zero in 16byte aligned loop.  */
+.Lcpy_loop2:
+	vl	%v16,16(%r5,%r3)
+	vst	%v18,0(%r5,%r2)
+	aghi	%r5,16
+
+.Lcpy_loop64:
+	vl	%v16,0(%r5,%r3)
+	vfenezfs %v17,%v16,%v16	/* Find element not equal with zero search.  */
+	je	.Lcpy_found_v16 /* Jump away if zero was found.  */
+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
+	vst	%v16,0(%r5,%r2)	/* Save previous part without zero to dst.  */
+	vfenezfs %v17,%v18,%v18
+	je	.Lcpy_found_v18_16
+	vl	%v16,32(%r5,%r3)
+	vst	%v18,16(%r5,%r2)
+	vfenezfs %v17,%v16,%v16
+	je	.Lcpy_found_v16_32
+	vl	%v18,48(%r5,%r3)
+	vst	%v16,32(%r5,%r2)
+	vfenezfs %v17,%v18,%v18
+	je	.Lcpy_found_v18_48
+	vst	%v18,48(%r5,%r2)
+
+	aghi	%r5,64
+	lgr	%r1,%r5		/* If %r5 + 64 < maxlen? -> loop64.  */
+	aghi	%r1,64
+	clgrjl	%r1,%r4,.Lcpy_loop64
+
+	vl	%v16,0(%r5,%r3)	/* Load s.  */
+	j	.Lcpy_lt64
+
+.Lfallback:
+	jg	__wcsncat_c
+END(__wcsncat_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */