mirror of
https://github.com/DrBeef/Raze.git
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251 lines
6.2 KiB
C
251 lines
6.2 KiB
C
// Function-wrapped Watcom pragmas
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// by Jonathon Fowler (jonof@edgenetwk.com)
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//
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// These functions represent some of the more longer-winded pragmas
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// from the original pragmas.h wrapped into functions for easier
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// use since many jumps and whatnot make it harder to write macro-
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// inline versions. I'll eventually convert these to macro-inline
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// equivalents. --Jonathon
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//#include "pragmas.h"
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#include "compat.h"
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int32_t dmval;
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#if defined(__GNUC__) && defined(__i386__) && !defined(NOASM) // NOASM
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//
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// GCC Inline Assembler version
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//
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#define ASM __asm__ __volatile__
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int32_t boundmulscale(int32_t a, int32_t b, int32_t c)
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{
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ASM(
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"imull %%ebx\n\t"
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"movl %%edx, %%ebx\n\t" // mov ebx, edx
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"shrdl %%cl, %%edx, %%eax\n\t" // mov eax, edx, cl
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"sarl %%cl, %%edx\n\t" // sar edx, cl
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"xorl %%eax, %%edx\n\t" // xor edx, eax
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"js 0f\n\t" // js checkit
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"xorl %%eax, %%edx\n\t" // xor edx, eax
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"jz 1f\n\t" // js skipboundit
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"cmpl $0xffffffff, %%edx\n\t" // cmp edx, 0xffffffff
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"je 1f\n\t" // je skipboundit
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"0:\n\t" // checkit:
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"movl %%ebx, %%eax\n\t" // mov eax, ebx
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"sarl $31, %%eax\n\t" // sar eax, 31
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"xorl $0x7fffffff, %%eax\n\t" // xor eax, 0x7fffffff
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"1:" // skipboundit:
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: "+a"(a), "+b"(b), "+c"(c) // input eax ebx ecx
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:
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: "edx", "cc"
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);
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return a;
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}
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void clearbufbyte(void *D, int32_t c, int32_t a)
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{
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ASM(
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"cmpl $4, %%ecx\n\t"
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"jae 1f\n\t"
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"testb $1, %%cl\n\t"
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"jz 0f\n\t" // jz preskip
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"stosb\n\t"
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"0:\n\t" // preskip:
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"shrl $1, %%ecx\n\t"
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"rep\n\t"
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"stosw\n\t"
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"jmp 5f\n\t" // jmp endit
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"1:\n\t" // intcopy:
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"testl $1, %%edi\n\t"
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"jz 2f\n\t" // jz skip1
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"stosb\n\t"
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"decl %%ecx\n\t"
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"2:\n\t" // skip1:
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"testl $2, %%edi\n\t"
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"jz 3f\n\t" // jz skip2
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"stosw\n\t"
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"subl $2, %%ecx\n\t"
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"3:\n\t" // skip2:
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"movl %%ecx, %%ebx\n\t"
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"shrl $2, %%ecx\n\t"
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"rep\n\t"
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"stosl\n\t"
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"testb $2, %%bl\n\t"
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"jz 4f\n\t" // jz skip3
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"stosw\n\t"
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"4:\n\t" // skip3:
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"testb $1, %%bl\n\t"
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"jz 5f\n\t" // jz endit
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"stosb\n\t"
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"5:" // endit
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: "+D"(D), "+c"(c), "+a"(a) :
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: "ebx", "memory", "cc"
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);
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}
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void copybufbyte(void *S, void *D, int32_t c)
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{
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ASM(
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"cmpl $4, %%ecx\n\t" // cmp ecx, 4
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"jae 1f\n\t"
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"testb $1, %%cl\n\t" // test cl, 1
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"jz 0f\n\t"
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"movsb\n\t"
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"0:\n\t" // preskip:
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"shrl $1, %%ecx\n\t" // shr ecx, 1
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"rep\n\t"
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"movsw\n\t"
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"jmp 5f\n\t"
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"1:\n\t" // intcopy:
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"testl $1, %%edi\n\t" // test edi, 1
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"jz 2f\n\t"
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"movsb\n\t"
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"decl %%ecx\n\t"
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"2:\n\t" // skip1:
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"testl $2, %%edi\n\t" // test edi, 2
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"jz 3f\n\t"
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"movsw\n\t"
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"subl $2, %%ecx\n\t" // sub ecx, 2
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"3:\n\t" // skip2:
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"movl %%ecx, %%ebx\n\t" // mov ebx, ecx
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"shrl $2, %%ecx\n\t" // shr ecx ,2
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"rep\n\t"
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"movsl\n\t"
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"testb $2, %%bl\n\t" // test bl, 2
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"jz 4f\n\t"
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"movsw\n\t"
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"4:\n\t" // skip3:
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"testb $1, %%bl\n\t" // test bl, 1
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"jz 5f\n\t"
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"movsb\n\t"
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"5:" // endit:
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: "+c"(c), "+S"(S), "+D"(D) :
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: "ebx", "memory", "cc"
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);
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}
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void copybufreverse(void *S, void *D, int32_t c)
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{
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ASM(
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"shrl $1, %%ecx\n\t"
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"jnc 0f\n\t" // jnc skipit1
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"movb (%%esi), %%al\n\t"
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"decl %%esi\n\t"
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"movb %%al, (%%edi)\n\t"
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"incl %%edi\n\t"
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"0:\n\t" // skipit1:
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"shrl $1, %%ecx\n\t"
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"jnc 1f\n\t" // jnc skipit2
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"movw -1(%%esi), %%ax\n\t"
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"subl $2, %%esi\n\t"
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"rorw $8, %%ax\n\t"
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"movw %%ax, (%%edi)\n\t"
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"addl $2, %%edi\n\t"
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"1:\n\t" // skipit2
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"testl %%ecx, %%ecx\n\t"
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"jz 3f\n\t" // jz endloop
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"2:\n\t" // begloop
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"movl -3(%%esi), %%eax\n\t"
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"subl $4, %%esi\n\t"
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"bswapl %%eax\n\t"
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"movl %%eax, (%%edi)\n\t"
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"addl $4, %%edi\n\t"
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"decl %%ecx\n\t"
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"jnz 2b\n\t" // jnz begloop
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"3:"
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: "+S"(S), "+D"(D), "+c"(c) :
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: "eax", "memory", "cc"
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);
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}
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#elif defined(__WATCOMC__) && !defined(NOASM) // __GNUC__ && __i386__
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//
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// Watcom C Inline Assembler version
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//
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#elif defined(_MSC_VER) && !defined(NOASM) // __WATCOMC__
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//
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// Microsoft C Inline Assembler version
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//
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#else // _MSC_VER
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//
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// Generic C version
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//
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void qinterpolatedown16(intptr_t bufptr, int32_t num, int32_t val, int32_t add)
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{
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// gee, I wonder who could have provided this...
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int32_t i, *lptr = (int32_t *)bufptr;
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for (i=0; i<num; i++) { lptr[i] = (val>>16); val += add; }
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}
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void qinterpolatedown16short(intptr_t bufptr, int32_t num, int32_t val, int32_t add)
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{
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// ...maybe the same person who provided this too?
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int32_t i; int16_t *sptr = (int16_t *)bufptr;
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for (i=0; i<num; i++) { sptr[i] = (int16_t)(val>>16); val += add; }
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}
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void clearbuf(void *d, int32_t c, int32_t a)
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{
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int32_t *p = (int32_t*)d;
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while ((c--) > 0) *(p++) = a;
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}
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void copybuf(void *s, void *d, int32_t c)
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{
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int32_t *p = (int32_t*)s, *q = (int32_t*)d;
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while ((c--) > 0) *(q++) = *(p++);
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}
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void swapbuf4(void *a, void *b, int32_t c)
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{
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int32_t *p = (int32_t*)a, *q = (int32_t*)b;
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int32_t x, y;
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while ((c--) > 0)
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{
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x = *q;
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y = *p;
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*(q++) = y;
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*(p++) = x;
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}
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}
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void clearbufbyte(void *D, int32_t c, int32_t a)
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{
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// Cringe City
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char *p = (char*)D;
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int32_t m[4] = { 0xffl,0xff00l,0xff0000l,0xff000000l };
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int32_t n[4] = { 0,8,16,24 };
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int32_t z=0;
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while ((c--) > 0)
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{
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*(p++) = (uint8_t)((a & m[z])>>n[z]);
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z=(z+1)&3;
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}
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}
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void copybufbyte(void *S, void *D, int32_t c)
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{
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char *p = (char*)S, *q = (char*)D;
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while ((c--) > 0) *(q++) = *(p++);
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}
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void copybufreverse(void *S, void *D, int32_t c)
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{
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char *p = (char*)S, *q = (char*)D;
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while ((c--) > 0) *(q++) = *(p--);
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}
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#endif
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