qzdoom/src/gccinlines.h

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// "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)
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: "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)
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: "cc"
);
return result;
}
#define MAKECONSTMulScale(s) \
static inline SDWORD MulScale##s (SDWORD a, SDWORD b) { return ((SQWORD)a * b) >> s; }
MAKECONSTMulScale(1)
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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)
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MAKECONSTDMulScale(12)
MAKECONSTDMulScale(13)
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MAKECONSTDMulScale(15)
MAKECONSTDMulScale(16)
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MAKECONSTDMulScale(18)
MAKECONSTDMulScale(19)
MAKECONSTDMulScale(20)
MAKECONSTDMulScale(21)
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MAKECONSTDMulScale(23)
MAKECONSTDMulScale(24)
MAKECONSTDMulScale(25)
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MAKECONSTDMulScale(27)
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MAKECONSTDMulScale(29)
MAKECONSTDMulScale(30)
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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)
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MAKECONSTTMulScale(24)
MAKECONSTTMulScale(25)
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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)
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: "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)
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: "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) \
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: "cc"); \
return result; \
}
MAKECONSTDivScale(2)
MAKECONSTDivScale(3)
MAKECONSTDivScale(4)
MAKECONSTDivScale(5)
MAKECONSTDivScale(6)
MAKECONSTDivScale(7)
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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)
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: "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))
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:"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)
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:"cc");
return result;
}