1*53932Shibler /* 2*53932Shibler * Derived from X11R4 3*53932Shibler */ 4*53932Shibler 5*53932Shibler /* the following notes use the following conventions: 6*53932Shibler SCREEN LEFT SCREEN RIGHT 7*53932Shibler in this file and maskbits.c, left and right refer to screen coordinates, 8*53932Shibler NOT bit numbering in registers. 9*53932Shibler 10*53932Shibler starttab[n] 11*53932Shibler bits[0,n-1] = 0 bits[n,31] = 1 12*53932Shibler endtab[n] = 13*53932Shibler bits[0,n-1] = 1 bits[n,31] = 0 14*53932Shibler 15*53932Shibler maskbits(x, w, startmask, endmask, nlw) 16*53932Shibler for a span of width w starting at position x, returns 17*53932Shibler a mask for ragged bits at start, mask for ragged bits at end, 18*53932Shibler and the number of whole longwords between the ends. 19*53932Shibler 20*53932Shibler */ 21*53932Shibler 22*53932Shibler #define maskbits(x, w, startmask, endmask, nlw) \ 23*53932Shibler startmask = starttab[(x)&0x1f]; \ 24*53932Shibler endmask = endtab[((x)+(w)) & 0x1f]; \ 25*53932Shibler if (startmask) \ 26*53932Shibler nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \ 27*53932Shibler else \ 28*53932Shibler nlw = (w) >> 5; 29*53932Shibler 30*53932Shibler #define FASTGETBITS(psrc, x, w, dst) \ 31*53932Shibler asm ("bfextu %3{%1:%2},%0" \ 32*53932Shibler : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc))) 33*53932Shibler 34*53932Shibler #define FASTPUTBITS(src, x, w, pdst) \ 35*53932Shibler asm ("bfins %3,%0{%1:%2}" \ 36*53932Shibler : "=o" (*(char *)(pdst)) \ 37*53932Shibler : "di" (x), "di" (w), "d" (src), "0" (*(char *) (pdst))) 38*53932Shibler 39*53932Shibler #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 40*53932Shibler { \ 41*53932Shibler register unsigned int _tmpsrc, _tmpdst; \ 42*53932Shibler FASTGETBITS(pdst, dstbit, width, _tmpdst); \ 43*53932Shibler FASTGETBITS(psrc, srcbit, width, _tmpsrc); \ 44*53932Shibler DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \ 45*53932Shibler FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 46*53932Shibler } 47*53932Shibler 48*53932Shibler #define getandputrop0(psrc, srcbit, width, pdst, rop) \ 49*53932Shibler getandputrop(psrc, srcbit, 0, width, pdst, rop) 50*53932Shibler 51*53932Shibler #define getunalignedword(psrc, x, dst) { \ 52*53932Shibler register int _tmp; \ 53*53932Shibler FASTGETBITS(psrc, x, 32, _tmp); \ 54*53932Shibler dst = _tmp; \ 55*53932Shibler } 56*53932Shibler 57*53932Shibler #define fnCLEAR(src, dst) (0) 58*53932Shibler #define fnCOPY(src, dst) (src) 59*53932Shibler #define fnXOR(src, dst) (src ^ dst) 60*53932Shibler #define fnCOPYINVERTED(src, dst)(~src) 61*53932Shibler 62*53932Shibler #define DoRop(result, alu, src, dst) \ 63*53932Shibler { \ 64*53932Shibler if (alu == RR_COPY) \ 65*53932Shibler result = fnCOPY (src, dst); \ 66*53932Shibler else \ 67*53932Shibler switch (alu) \ 68*53932Shibler { \ 69*53932Shibler case RR_CLEAR: \ 70*53932Shibler result = fnCLEAR (src, dst); \ 71*53932Shibler break; \ 72*53932Shibler case RR_XOR: \ 73*53932Shibler result = fnXOR (src, dst); \ 74*53932Shibler break; \ 75*53932Shibler case RR_COPYINVERTED: \ 76*53932Shibler result = fnCOPYINVERTED (src, dst); \ 77*53932Shibler break; \ 78*53932Shibler } \ 79*53932Shibler } 80