mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-24 13:01:47 +00:00
332 lines
7 KiB
C
332 lines
7 KiB
C
// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
|
|
// Ken Silverman's official web site: "http://www.advsys.net/ken"
|
|
// See the included license file "BUILDLIC.TXT" for license info.
|
|
//
|
|
// This file is based on pragmas.h from Ken Silverman's original Build
|
|
// source code release but is meant for use with GCC instead of Watcom C.
|
|
//
|
|
// Some of the inline assembly has been turned into C code, because
|
|
// modern compilers are smart enough to produce code at least as good as
|
|
// Ken's inline assembly.
|
|
//
|
|
|
|
// I can come up with several different operand constraints for the
|
|
// following that work just fine when used all by themselves, but
|
|
// when I concatenate them together so that the compiler can choose
|
|
// between them, I get the following (but only if enough parameters
|
|
// are passed as the result of some operations instead of as
|
|
// variables/constants--e.g. DMulScale16 (a*2, b*2, c*2, d*2) instead of
|
|
// DMulScale16 (a, b, c, d)):
|
|
//
|
|
// `asm' operand requires impossible reload
|
|
//
|
|
// Why?
|
|
|
|
#include <stdlib.h>
|
|
|
|
#ifndef alloca
|
|
// MinGW does not seem to come with alloca defined.
|
|
#define alloca __builtin_alloca
|
|
#endif
|
|
|
|
static inline SDWORD Scale (SDWORD a, SDWORD b, SDWORD c)
|
|
{
|
|
SDWORD result, dummy;
|
|
|
|
asm volatile
|
|
("imull %3\n\t"
|
|
"idivl %4"
|
|
: "=a,a,a,a,a,a" (result),
|
|
"=&d,&d,&d,&d,d,d" (dummy)
|
|
: "a,a,a,a,a,a" (a),
|
|
"m,r,m,r,d,d" (b),
|
|
"r,r,m,m,r,m" (c)
|
|
: "cc"
|
|
);
|
|
|
|
return result;
|
|
}
|
|
|
|
static inline SDWORD MulScale (SDWORD a, SDWORD b, SDWORD c)
|
|
{
|
|
SDWORD result, dummy;
|
|
|
|
asm volatile
|
|
("imull %3\n\t"
|
|
"shrdl %b4,%1,%0"
|
|
: "=a,a,a,a" (result),
|
|
"=d,d,d,d" (dummy)
|
|
: "a,a,a,a" (a),
|
|
"m,r,m,r" (b),
|
|
"c,c,I,I" (c)
|
|
: "cc"
|
|
);
|
|
return result;
|
|
}
|
|
|
|
#define MAKECONSTMulScale(s) \
|
|
static inline SDWORD MulScale##s (SDWORD a, SDWORD b) { return ((SQWORD)a * b) >> s; }
|
|
|
|
MAKECONSTMulScale(1)
|
|
MAKECONSTMulScale(2)
|
|
MAKECONSTMulScale(3)
|
|
MAKECONSTMulScale(4)
|
|
MAKECONSTMulScale(5)
|
|
MAKECONSTMulScale(6)
|
|
MAKECONSTMulScale(7)
|
|
MAKECONSTMulScale(8)
|
|
MAKECONSTMulScale(9)
|
|
MAKECONSTMulScale(10)
|
|
MAKECONSTMulScale(11)
|
|
MAKECONSTMulScale(12)
|
|
MAKECONSTMulScale(13)
|
|
MAKECONSTMulScale(14)
|
|
MAKECONSTMulScale(15)
|
|
MAKECONSTMulScale(16)
|
|
MAKECONSTMulScale(17)
|
|
MAKECONSTMulScale(18)
|
|
MAKECONSTMulScale(19)
|
|
MAKECONSTMulScale(20)
|
|
MAKECONSTMulScale(21)
|
|
MAKECONSTMulScale(22)
|
|
MAKECONSTMulScale(23)
|
|
MAKECONSTMulScale(24)
|
|
MAKECONSTMulScale(25)
|
|
MAKECONSTMulScale(26)
|
|
MAKECONSTMulScale(27)
|
|
MAKECONSTMulScale(28)
|
|
MAKECONSTMulScale(29)
|
|
MAKECONSTMulScale(30)
|
|
MAKECONSTMulScale(31)
|
|
MAKECONSTMulScale(32)
|
|
#undef MAKECONSTMulScale
|
|
|
|
static inline DWORD UMulScale16(DWORD a, DWORD b) { return ((QWORD)a * b) >> 16; }
|
|
|
|
#define MAKECONSTDMulScale(s) \
|
|
static inline SDWORD DMulScale##s (SDWORD a, SDWORD b, SDWORD c, SDWORD d) \
|
|
{ \
|
|
return (((SQWORD)a * b) + ((SQWORD)c * d)) >> s; \
|
|
}
|
|
|
|
MAKECONSTDMulScale(1)
|
|
MAKECONSTDMulScale(2)
|
|
MAKECONSTDMulScale(3)
|
|
MAKECONSTDMulScale(4)
|
|
MAKECONSTDMulScale(5)
|
|
MAKECONSTDMulScale(6)
|
|
MAKECONSTDMulScale(7)
|
|
MAKECONSTDMulScale(8)
|
|
MAKECONSTDMulScale(9)
|
|
MAKECONSTDMulScale(10)
|
|
MAKECONSTDMulScale(11)
|
|
MAKECONSTDMulScale(12)
|
|
MAKECONSTDMulScale(13)
|
|
MAKECONSTDMulScale(14)
|
|
MAKECONSTDMulScale(15)
|
|
MAKECONSTDMulScale(16)
|
|
MAKECONSTDMulScale(17)
|
|
MAKECONSTDMulScale(18)
|
|
MAKECONSTDMulScale(19)
|
|
MAKECONSTDMulScale(20)
|
|
MAKECONSTDMulScale(21)
|
|
MAKECONSTDMulScale(22)
|
|
MAKECONSTDMulScale(23)
|
|
MAKECONSTDMulScale(24)
|
|
MAKECONSTDMulScale(25)
|
|
MAKECONSTDMulScale(26)
|
|
MAKECONSTDMulScale(27)
|
|
MAKECONSTDMulScale(28)
|
|
MAKECONSTDMulScale(29)
|
|
MAKECONSTDMulScale(30)
|
|
MAKECONSTDMulScale(31)
|
|
MAKECONSTDMulScale(32)
|
|
#undef MAKECONSTDMulScale
|
|
|
|
#define MAKECONSTTMulScale(s) \
|
|
static inline SDWORD TMulScale##s (SDWORD a, SDWORD b, SDWORD c, SDWORD d, SDWORD e, SDWORD ee) \
|
|
{ \
|
|
return (((SQWORD)a * b) + ((SQWORD)c * d) + ((SQWORD)e * ee)) >> s; \
|
|
}
|
|
|
|
MAKECONSTTMulScale(1)
|
|
MAKECONSTTMulScale(2)
|
|
MAKECONSTTMulScale(3)
|
|
MAKECONSTTMulScale(4)
|
|
MAKECONSTTMulScale(5)
|
|
MAKECONSTTMulScale(6)
|
|
MAKECONSTTMulScale(7)
|
|
MAKECONSTTMulScale(8)
|
|
MAKECONSTTMulScale(9)
|
|
MAKECONSTTMulScale(10)
|
|
MAKECONSTTMulScale(11)
|
|
MAKECONSTTMulScale(12)
|
|
MAKECONSTTMulScale(13)
|
|
MAKECONSTTMulScale(14)
|
|
MAKECONSTTMulScale(15)
|
|
MAKECONSTTMulScale(16)
|
|
MAKECONSTTMulScale(17)
|
|
MAKECONSTTMulScale(18)
|
|
MAKECONSTTMulScale(19)
|
|
MAKECONSTTMulScale(20)
|
|
MAKECONSTTMulScale(21)
|
|
MAKECONSTTMulScale(22)
|
|
MAKECONSTTMulScale(23)
|
|
MAKECONSTTMulScale(24)
|
|
MAKECONSTTMulScale(25)
|
|
MAKECONSTTMulScale(26)
|
|
MAKECONSTTMulScale(27)
|
|
MAKECONSTTMulScale(28)
|
|
MAKECONSTTMulScale(29)
|
|
MAKECONSTTMulScale(30)
|
|
MAKECONSTTMulScale(31)
|
|
MAKECONSTTMulScale(32)
|
|
#undef MAKECONSTTMulScale
|
|
|
|
static inline SDWORD BoundMulScale (SDWORD a, SDWORD b, SDWORD c)
|
|
{
|
|
union {
|
|
long long big;
|
|
struct
|
|
{
|
|
int l, h;
|
|
};
|
|
} u;
|
|
u.big = ((long long)a * b) >> c;
|
|
if ((u.h ^ u.l) < 0 || (unsigned int)(u.h+1) > 1) return (u.h >> 31) ^ 0x7fffffff;
|
|
return u.l;
|
|
}
|
|
|
|
static inline SDWORD DivScale (SDWORD a, SDWORD b, SDWORD c)
|
|
{
|
|
SDWORD result, dummy;
|
|
SDWORD lo = a << c;
|
|
SDWORD hi = a >> (-c);
|
|
|
|
asm volatile
|
|
("idivl %4"
|
|
:"=a" (result),
|
|
"=d" (dummy)
|
|
: "a" (lo),
|
|
"d" (hi),
|
|
"r" (b)
|
|
: "cc");
|
|
return result;
|
|
}
|
|
|
|
static inline SDWORD DivScale1 (SDWORD a, SDWORD b)
|
|
{
|
|
SDWORD result, dummy;
|
|
|
|
asm volatile
|
|
("addl %%eax,%%eax\n\t"
|
|
"sbbl %%edx,%%edx\n\t"
|
|
"idivl %3"
|
|
:"=a,a" (result),
|
|
"=&d,d" (dummy)
|
|
: "a,a" (a),
|
|
"r,m" (b)
|
|
: "cc");
|
|
return result;
|
|
}
|
|
|
|
#define MAKECONSTDivScale(s) \
|
|
static inline SDWORD DivScale##s (SDWORD a, SDWORD b) \
|
|
{ \
|
|
SDWORD result, dummy; \
|
|
asm volatile \
|
|
("idivl %4" \
|
|
:"=a,a" (result), \
|
|
"=d,d" (dummy) \
|
|
: "a,a" (a<<s), \
|
|
"d,d" (a>>(32-s)), \
|
|
"r,m" (b) \
|
|
: "cc"); \
|
|
return result; \
|
|
}
|
|
|
|
MAKECONSTDivScale(2)
|
|
MAKECONSTDivScale(3)
|
|
MAKECONSTDivScale(4)
|
|
MAKECONSTDivScale(5)
|
|
MAKECONSTDivScale(6)
|
|
MAKECONSTDivScale(7)
|
|
MAKECONSTDivScale(8)
|
|
MAKECONSTDivScale(9)
|
|
MAKECONSTDivScale(10)
|
|
MAKECONSTDivScale(11)
|
|
MAKECONSTDivScale(12)
|
|
MAKECONSTDivScale(13)
|
|
MAKECONSTDivScale(14)
|
|
MAKECONSTDivScale(15)
|
|
MAKECONSTDivScale(16)
|
|
MAKECONSTDivScale(17)
|
|
MAKECONSTDivScale(18)
|
|
MAKECONSTDivScale(19)
|
|
MAKECONSTDivScale(20)
|
|
MAKECONSTDivScale(21)
|
|
MAKECONSTDivScale(22)
|
|
MAKECONSTDivScale(23)
|
|
MAKECONSTDivScale(24)
|
|
MAKECONSTDivScale(25)
|
|
MAKECONSTDivScale(26)
|
|
MAKECONSTDivScale(27)
|
|
MAKECONSTDivScale(28)
|
|
MAKECONSTDivScale(29)
|
|
MAKECONSTDivScale(30)
|
|
MAKECONSTDivScale(31)
|
|
#undef MAKECONSTDivScale
|
|
|
|
static inline SDWORD DivScale32 (SDWORD a, SDWORD b)
|
|
{
|
|
SDWORD result = 0, dummy;
|
|
|
|
asm volatile
|
|
("idivl %3"
|
|
:"+a,a" (result),
|
|
"=d,d" (dummy)
|
|
: "d,d" (a),
|
|
"r,m" (b)
|
|
: "cc");
|
|
return result;
|
|
}
|
|
|
|
static inline void clearbuf (void *buff, int count, SDWORD clear)
|
|
{
|
|
int dummy1, dummy2;
|
|
asm volatile
|
|
("rep stosl"
|
|
:"=D" (dummy1),
|
|
"=c" (dummy2)
|
|
: "D" (buff),
|
|
"c" (count),
|
|
"a" (clear)
|
|
);
|
|
}
|
|
|
|
static inline void clearbufshort (void *buff, unsigned int count, WORD clear)
|
|
{
|
|
asm volatile
|
|
("shr $1,%%ecx\n\t"
|
|
"rep stosl\n\t"
|
|
"adc %%ecx,%%ecx\n\t"
|
|
"rep stosw"
|
|
:"=D" (buff), "=c" (count)
|
|
:"D" (buff), "c" (count), "a" (clear|(clear<<16))
|
|
:"cc");
|
|
}
|
|
|
|
static inline SDWORD ksgn (SDWORD a)
|
|
{
|
|
SDWORD result, dummy;
|
|
|
|
asm volatile
|
|
("add %0,%0\n\t"
|
|
"sbb %1,%1\n\t"
|
|
"cmp %0,%1\n\t"
|
|
"adc $0,%1"
|
|
:"=r" (dummy), "=r" (result)
|
|
:"0" (a)
|
|
:"cc");
|
|
return result;
|
|
}
|