e87f36d9a7
Appling patch from a92961004d
that fixes https://github.com/haikuports/haikuports/issues/3045
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/*
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compiler.h
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Compiler-specific #defines and such
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for Tux Paint
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Mostly by Albert Cahalan <albert@users.sf.net>
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Copyright (c) 2002-2019
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http://www.newbreedsoftware.com/tuxpaint/
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(See COPYING.txt)
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June 14, 2002 - September 12, 2019
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$Id$
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*/
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#ifdef __GNUC__
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// This version has strict type checking for safety.
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// See the "unnecessary" pointer comparison. (from Linux)
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#define min(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x < _y ? _x : _y; })
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#define max(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x > _y ? _x : _y; })
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#else
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#define max(a,b) (((a) > (b)) ? (a) : (b))
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#endif
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#define clamp(lo,value,hi) (min(max(value,lo),hi))
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// since gcc-2.5
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#ifdef __GNUC__
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#define NORETURN __attribute__((__noreturn__))
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#define FUNCTION __attribute__((__const__)) // no access to global mem, even via ptr, and no side effect
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#else
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#define NORETURN
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#define FUNCTION
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#endif
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#if !defined(restrict) && __STDC_VERSION__ < 199901
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#if __GNUC__ > 2 || __GNUC_MINOR__ >= 92
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#define restrict __restrict__
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#else
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#warning No restrict keyword?
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#define restrict
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#endif
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#endif
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#if __GNUC__ > 2 || __GNUC_MINOR__ >= 96
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// won't alias anything, and aligned enough for anything
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#define MALLOC __attribute__ ((__malloc__))
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// no side effect, may read globals
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#ifndef WIN32
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#define PURE __attribute__ ((__pure__))
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#endif
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// tell gcc what to expect: if(unlikely(err)) die(err);
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#define likely(x) __builtin_expect(!!(x),1)
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#define unlikely(x) __builtin_expect(!!(x),0)
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#define expected(x,y) __builtin_expect((x),(y))
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#else
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#define MALLOC
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#define PURE
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#define likely(x) (x)
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#define unlikely(x) (x)
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#define expected(x,y) (x)
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#endif
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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#define MUST_CHECK __attribute__((warn_unused_result))
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#else
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#define MUST_CHECK
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#endif
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#ifdef __powerpc__
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// Ticks at 1/4 the memory bus clock (24.907667 MHz on Albert's Mac Cube)
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// This is good for 80-second diff or 160-second total.
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#define CLOCK_ASM(tbl) asm volatile("mftb %0" : "=r" (tbl))
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#define CLOCK_TYPE unsigned long
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#ifndef CLOCK_SPEED
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// #warning Benchmark times are based on a 99.63 MHz memory bus.
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#define CLOCK_SPEED 24907667.0
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#endif
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#endif
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#ifdef __i386__
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#define CLOCK_ASM(tbl) asm volatile("rdtsc" : "=A" (tbl))
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#define CLOCK_TYPE unsigned long long
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#ifndef CLOCK_SPEED
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// #warning Benchmark times are based on a 450 MHz CPU.
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#define CLOCK_SPEED 450000000.0
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#endif
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#endif
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#ifndef CLOCK_ASM
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// #warning No idea how to read CPU cycles for you, sorry.
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#define CLOCK_ASM(tbl)
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#define CLOCK_TYPE unsigned long
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#define CLOCK_SPEED 1000000000.0
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#endif
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#ifdef NO_ASM
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#undef CLOCK_ASM
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#define CLOCK_ASM(x) x=42
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#endif
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/* h/t https://tutel.me/c/programming/questions/45349079/how+to+use+__attribute__fallthrough+correctly+in+gcc */
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#ifndef FALLTHROUGH
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#if defined(__GNUC__) && __GNUC__ >= 7
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#define FALL_THROUGH __attribute__ ((fallthrough))
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#else
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#define FALL_THROUGH ((void)0)
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#endif /* __GNUC__ >= 7 */
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#endif
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