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