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Diffstat (limited to 'config/picochip/libgccExtras/ashrsi3.c')
-rw-r--r-- | config/picochip/libgccExtras/ashrsi3.c | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/config/picochip/libgccExtras/ashrsi3.c b/config/picochip/libgccExtras/ashrsi3.c deleted file mode 100644 index fee3342112b..00000000000 --- a/config/picochip/libgccExtras/ashrsi3.c +++ /dev/null @@ -1,118 +0,0 @@ -/* - -picoChip GCC support for 32-bit arithmetic shift right. - -Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. -Contributed by picoChip Designs Ltd. -Maintained by Daniel Towner (daniel.towner@picochip.com) - -This file is free software; you can redistribute it and/or modify it -under the terms of the GNU General Public License as published by the -Free Software Foundation; either version 2, or (at your option) any -later version. - -In addition to the permissions in the GNU General Public License, the -Free Software Foundation gives you unlimited permission to link the -compiled version of this file into combinations with other programs, -and to distribute those combinations without any restriction coming -from the use of this file. (The General Public License restrictions -do apply in other respects; for example, they cover modification of -the file, and distribution when not linked into a combine -executable.) - -This file 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 -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; see the file COPYING. If not, write to -the Free Software Foundation, 51 Franklin Street, Fifth Floor, -Boston, MA 02110-1301, USA. */ - -typedef int HItype __attribute__ ((mode (HI))); -typedef unsigned int UHItype __attribute__ ((mode (HI))); -typedef unsigned int USItype __attribute__ ((mode (SI))); - -typedef struct USIstruct { - UHItype low, high; -} USIstruct; - -typedef union USIunion { - USItype l; - USIstruct s; -} USIunion; - -USItype __ashrsi3(USIunion value, HItype count) { - USIunion result; - int temp; - int wordOfSignBits; - - /* Ignore a zero count until we get into the (count < 16) - clause. This is slightly slower when shifting by zero, but faster - and smaller in all other cases (due to the better scheduling - opportunities available by putting the test near computational - instructions. */ - /* if (count == 0) return value.l; */ - - if (count < 16) { - /* Shift low and high words by the count. The high word must use - an arithmetic shift. There is no arithmetic shift-right by - variable, so synthesise it. */ - int signWord; - int reverseCount; - - /* Shift low and high parts by the count. The upper word now has - invalid signed bits. */ - result.s.low = value.s.low >> count; - result.s.high = value.s.high >> count; - - if (count != 0) { - - reverseCount = 16 - count; - - /* Given a word of sign bits, shift back left to create the - destination sign bits. */ - wordOfSignBits = __builtin_asri(value.s.high, 15); - signWord = wordOfSignBits << reverseCount; - result.s.high |= signWord; - - /* There is now a hole in the upper `count' bits of the low - word. Shift the lower `count' bits of the upper word into the - low word. */ - temp = value.s.high << reverseCount; - result.s.low |= temp; - } - - } else { - int signWord; - - /* Shift is greater than one word, so top word will always be set - to sign bits, and bottom word will be shifted from top word. */ - result.s.low = value.s.high >> count; - result.s.high = __builtin_asri(value.s.high, 15); - - if (count != 16) { - - /* Shift the upper word of the source into the lower word of the - result. Arithmetically shift the upper word as well, to retain - the sign. This shift must be synthesised, as no such shift - exists in the instruction set. */ - int signWord; - - - /* Given a complete word of sign-bits, shift this back left to - create the destination sign bits. */ - signWord = result.s.high << (16 - count); - // signWord = wordOfSignBits << (16 - count); - - /* Insert the sign bits to the result's low word. */ - result.s.low |= signWord; - - } - - } - - return result.l; - -} |