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, 88 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/powerpc/powerpc64/fpu/s_llroundf.S b/REORG.TODO/sysdeps/powerpc/powerpc64/fpu/s_llroundf.S
new file mode 100644
index 0000000000..3e910ac322
--- /dev/null
+++ b/REORG.TODO/sysdeps/powerpc/powerpc64/fpu/s_llroundf.S
@@ -0,0 +1,88 @@
+/* llroundf function.  PowerPC64 version.
+   Copyright (C) 2004-2017 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>
+
+	.section	".toc","aw"
+.LC0:	/* 2^23 */
+	.tc FD_41600000_0[TC],0x4160000000000000
+.LC1:	/* 0.5 */
+	.tc FD_3fe00000_0[TC],0x3fe0000000000000
+.LC2:	/* 2^52 */
+	.tc FD_43300000_0[TC],0x4330000000000000
+	.section	".text"
+
+/* long long [r3] llroundf (float x [fp1])
+   IEEE 1003.1 llroundf function.  IEEE specifies "roundf to the nearest
+   integer value, rounding halfway cases away from zero, regardless of
+   the current rounding mode."  However PowerPC Architecture defines
+   "roundf to Nearest" as "Choose the best approximation. In case of a
+   tie, choose the one that is even (least significant bit o).".
+   So we can't use the PowerPC "round to Nearest" mode. Instead we set
+   "round toward Zero" mode and round by adding +-0.5 before rounding
+   to the integer value.
+
+   It is necessary to detect when x is (+-)0x1.fffffffffffffp-2
+   because adding +-0.5 in this case will cause an erroneous shift,
+   carry and round.  We simply return 0 if 0.5 > x > -0.5.  Likewise
+   if x is and odd number between +-(2^23 and 2^24-1) a shift and
+   carry will erroneously round if biased with +-0.5.  Therefore if x
+   is greater/less than +-2^23 we don't need to bias the number with
+   +-0.5.  */
+
+ENTRY (__llroundf)
+	CALL_MCOUNT 0
+	lfd	fp9,.LC0@toc(2)	/* Load 2^23 into fpr9.  */
+	lfd	fp10,.LC1@toc(2)/* Load 0.5 into fpr10.  */
+	lfd	fp11,.LC2@toc(2)	/* Load 2^52 into fpr11.  */
+	fabs	fp2,fp1		/* Get the absolute value of x.  */
+	fsub	fp12,fp10,fp10	/* Compute 0.0 into fp12.  */
+	fcmpu	cr6,fp2,fp10	/* if |x| < 0.5  */
+	fcmpu	cr7,fp2,fp9	/* if |x| >= 2^23  */
+	fcmpu	cr1,fp1,fp12	/* x is negative? x < 0.0  */
+	blt-	cr6,.Lretzero	/* 0.5 > x < -0.5 so just return 0.  */
+	bge-	cr7,.Lnobias	/* 2^23 > x < -2^23 just convert with no bias.  */
+	/* Test whether an integer to avoid spurious "inexact".  */
+	fadd	fp3,fp2,fp11
+	fsub	fp3,fp3,fp11
+	fcmpu	cr5,fp2,fp3
+	beq	cr5,.Lnobias
+	fadd	fp3,fp2,fp10	/* |x|+=0.5 bias to prepare to round.  */
+	bge	cr1,.Lconvert	/* x is positive so don't negate x.  */
+	fnabs	fp3,fp3		/* -(|x|+=0.5)  */
+.Lconvert:
+	fctidz	fp4,fp3		/* Convert to Integer double word round toward 0.  */
+	stfd	fp4,-16(r1)
+	nop
+	nop
+	nop
+	ld	r3,-16(r1)	/* Load return as integer.  */
+.Lout:
+	blr
+.Lretzero:			/* 0.5 > x > -0.5  */
+	li	r3,0		/* return 0.  */
+	b	.Lout
+.Lnobias:
+	fmr	fp3,fp1
+	b	.Lconvert
+	END (__llroundf)
+
+strong_alias (__llroundf, __lroundf)
+weak_alias (__llroundf, llroundf)
+weak_alias (__lroundf, lroundf)
+