?? d_polysa.s
字號(hào):
//
// d_polysa.s
// x86 assembly-language polygon model drawing code
//
#include "qasm.h"
#include "d_ifacea.h"
#if id386
// !!! if this is changed, it must be changed in d_polyse.c too !!!
#define DPS_MAXSPANS MAXHEIGHT+1
// 1 extra for spanpackage that marks end
//#define SPAN_SIZE (((DPS_MAXSPANS + 1 + ((CACHE_SIZE - 1) / spanpackage_t_size)) + 1) * spanpackage_t_size)
#define SPAN_SIZE (1024+1+1+1)*32
.data
.align 4
p10_minus_p20: .single 0
p01_minus_p21: .single 0
temp0: .single 0
temp1: .single 0
Ltemp: .single 0
aff8entryvec_table: .long LDraw8, LDraw7, LDraw6, LDraw5
.long LDraw4, LDraw3, LDraw2, LDraw1
lzistepx: .long 0
.text
#ifndef NeXT
.extern C(D_PolysetSetEdgeTable)
.extern C(D_RasterizeAliasPolySmooth)
#endif
//----------------------------------------------------------------------
// affine triangle gradient calculation code
//----------------------------------------------------------------------
#if 0
#define skinwidth 4+0
.globl C(R_PolysetCalcGradients)
C(R_PolysetCalcGradients):
// p00_minus_p20 = r_p0[0] - r_p2[0];
// p01_minus_p21 = r_p0[1] - r_p2[1];
// p10_minus_p20 = r_p1[0] - r_p2[0];
// p11_minus_p21 = r_p1[1] - r_p2[1];
//
// xstepdenominv = 1.0 / (p10_minus_p20 * p01_minus_p21 -
// p00_minus_p20 * p11_minus_p21);
//
// ystepdenominv = -xstepdenominv;
fildl C(r_p0)+0 // r_p0[0]
fildl C(r_p2)+0 // r_p2[0] | r_p0[0]
fildl C(r_p0)+4 // r_p0[1] | r_p2[0] | r_p0[0]
fildl C(r_p2)+4 // r_p2[1] | r_p0[1] | r_p2[0] | r_p0[0]
fildl C(r_p1)+0 // r_p1[0] | r_p2[1] | r_p0[1] | r_p2[0] | r_p0[0]
fildl C(r_p1)+4 // r_p1[1] | r_p1[0] | r_p2[1] | r_p0[1] |
// r_p2[0] | r_p0[0]
fxch %st(3) // r_p0[1] | r_p1[0] | r_p2[1] | r_p1[1] |
// r_p2[0] | r_p0[0]
fsub %st(2),%st(0) // p01_minus_p21 | r_p1[0] | r_p2[1] | r_p1[1] |
// r_p2[0] | r_p0[0]
fxch %st(1) // r_p1[0] | p01_minus_p21 | r_p2[1] | r_p1[1] |
// r_p2[0] | r_p0[0]
fsub %st(4),%st(0) // p10_minus_p20 | p01_minus_p21 | r_p2[1] |
// r_p1[1] | r_p2[0] | r_p0[0]
fxch %st(5) // r_p0[0] | p01_minus_p21 | r_p2[1] |
// r_p1[1] | r_p2[0] | p10_minus_p20
fsubp %st(0),%st(4) // p01_minus_p21 | r_p2[1] | r_p1[1] |
// p00_minus_p20 | p10_minus_p20
fxch %st(2) // r_p1[1] | r_p2[1] | p01_minus_p21 |
// p00_minus_p20 | p10_minus_p20
fsubp %st(0),%st(1) // p11_minus_p21 | p01_minus_p21 |
// p00_minus_p20 | p10_minus_p20
fxch %st(1) // p01_minus_p21 | p11_minus_p21 |
// p00_minus_p20 | p10_minus_p20
flds C(d_xdenom) // d_xdenom | p01_minus_p21 | p11_minus_p21 |
// p00_minus_p20 | p10_minus_p20
fxch %st(4) // p10_minus_p20 | p01_minus_p21 | p11_minus_p21 |
// p00_minus_p20 | d_xdenom
fstps p10_minus_p20 // p01_minus_p21 | p11_minus_p21 |
// p00_minus_p20 | d_xdenom
fstps p01_minus_p21 // p11_minus_p21 | p00_minus_p20 | xstepdenominv
fxch %st(2) // xstepdenominv | p00_minus_p20 | p11_minus_p21
//// ceil () for light so positive steps are exaggerated, negative steps
//// diminished, pushing us away from underflow toward overflow. Underflow is
//// very visible, overflow is very unlikely, because of ambient lighting
// t0 = r_p0[4] - r_p2[4];
// t1 = r_p1[4] - r_p2[4];
fildl C(r_p2)+16 // r_p2[4] | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fildl C(r_p0)+16 // r_p0[4] | r_p2[4] | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fildl C(r_p1)+16 // r_p1[4] | r_p0[4] | r_p2[4] | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fxch %st(2) // r_p2[4] | r_p0[4] | r_p1[4] | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fld %st(0) // r_p2[4] | r_p2[4] | r_p0[4] | r_p1[4] |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fsubrp %st(0),%st(2) // r_p2[4] | t0 | r_p1[4] | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fsubrp %st(0),%st(2) // t0 | t1 | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
// r_lstepx = (int)
// ceil((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
// r_lstepy = (int)
// ceil((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
fld %st(0) // t0 | t0 | t1 | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmul %st(5),%st(0) // t0*p11_minus_p21 | t0 | t1 | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fxch %st(2) // t1 | t0 | t0*p11_minus_p21 | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fld %st(0) // t1 | t1 | t0 | t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmuls p01_minus_p21 // t1*p01_minus_p21 | t1 | t0 | t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // t0 | t1 | t1*p01_minus_p21 | t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmuls p10_minus_p20 // t0*p10_minus_p20 | t1 | t1*p01_minus_p21 |
// t0*p11_minus_p21 | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fxch %st(1) // t1 | t0*p10_minus_p20 | t1*p01_minus_p21 |
// t0*p11_minus_p21 | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fmul %st(5),%st(0) // t1*p00_minus_p20 | t0*p10_minus_p20 |
// t1*p01_minus_p21 | t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // t1*p01_minus_p21 | t0*p10_minus_p20 |
// t1*p00_minus_p20 | t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fsubp %st(0),%st(3) // t0*p10_minus_p20 | t1*p00_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fsubrp %st(0),%st(1) // t1*p00_minus_p20 - t0*p10_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fld %st(2) // xstepdenominv |
// t1*p00_minus_p20 - t0*p10_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmuls float_minus_1 // ystepdenominv |
// t1*p00_minus_p20 - t0*p10_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // t1*p01_minus_p21 - t0*p11_minus_p21 |
// t1*p00_minus_p20 - t0*p10_minus_p20 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmul %st(3),%st(0) // (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv |
// t1*p00_minus_p20 - t0*p10_minus_p20 |
// | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fxch %st(1) // t1*p00_minus_p20 - t0*p10_minus_p20 |
// (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmul %st(2),%st(0) // (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv |
// (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fldcw ceil_cw
fistpl C(r_lstepy) // r_lstepx | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fistpl C(r_lstepx) // ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fldcw single_cw
// t0 = r_p0[2] - r_p2[2];
// t1 = r_p1[2] - r_p2[2];
fildl C(r_p2)+8 // r_p2[2] | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fildl C(r_p0)+8 // r_p0[2] | r_p2[2] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fildl C(r_p1)+8 // r_p1[2] | r_p0[2] | r_p2[2] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // r_p2[2] | r_p0[2] | r_p1[2] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fld %st(0) // r_p2[2] | r_p2[2] | r_p0[2] | r_p1[2] |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubrp %st(0),%st(2) // r_p2[2] | t0 | r_p1[2] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fsubrp %st(0),%st(2) // t0 | t1 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
// r_sstepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
// xstepdenominv);
// r_sstepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
// ystepdenominv);
fld %st(0) // t0 | t0 | t1 | ystepdenominv | xstepdenominv
fmul %st(6),%st(0) // t0*p11_minus_p21 | t0 | t1 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // t1 | t0 | t0*p11_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fld %st(0) // t1 | t1 | t0 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmuls p01_minus_p21 // t1*p01_minus_p21 | t1 | t0 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fxch %st(2) // t0 | t1 | t1*p01_minus_p21 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmuls p10_minus_p20 // t0*p10_minus_p20 | t1 | t1*p01_minus_p21 |
// t0*p11_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(1) // t1 | t0*p10_minus_p20 | t1*p01_minus_p21 |
// t0*p11_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmul %st(6),%st(0) // t1*p00_minus_p20 | t0*p10_minus_p20 |
// t1*p01_minus_p21 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fxch %st(2) // t1*p01_minus_p21 | t0*p10_minus_p20 |
// t1*p00_minus_p20 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubp %st(0),%st(3) // t0*p10_minus_p20 | t1*p00_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubrp %st(0),%st(1) // t1*p00_minus_p20 - t0*p10_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmul %st(2),%st(0) // (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fxch %st(1) // t1*p01_minus_p21 - t0*p11_minus_p21 |
// (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmul %st(3),%st(0) // (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv |
// (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(1) // (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv |
// (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fistpl C(r_sstepy) // r_sstepx | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fistpl C(r_sstepx) // ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
// t0 = r_p0[3] - r_p2[3];
// t1 = r_p1[3] - r_p2[3];
fildl C(r_p2)+12 // r_p2[3] | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fildl C(r_p0)+12 // r_p0[3] | r_p2[3] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fildl C(r_p1)+12 // r_p1[3] | r_p0[3] | r_p2[3] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // r_p2[3] | r_p0[3] | r_p1[3] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fld %st(0) // r_p2[3] | r_p2[3] | r_p0[3] | r_p1[3] |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubrp %st(0),%st(2) // r_p2[3] | t0 | r_p1[3] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fsubrp %st(0),%st(2) // t0 | t1 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
// r_tstepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
// xstepdenominv);
// r_tstepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
// ystepdenominv);
fld %st(0) // t0 | t0 | t1 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fmul %st(6),%st(0) // t0*p11_minus_p21 | t0 | t1 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // t1 | t0 | t0*p11_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fld %st(0) // t1 | t1 | t0 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmuls p01_minus_p21 // t1*p01_minus_p21 | t1 | t0 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fxch %st(2) // t0 | t1 | t1*p01_minus_p21 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmuls p10_minus_p20 // t0*p10_minus_p20 | t1 | t1*p01_minus_p21 |
// t0*p11_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(1) // t1 | t0*p10_minus_p20 | t1*p01_minus_p21 |
// t0*p11_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmul %st(6),%st(0) // t1*p00_minus_p20 | t0*p10_minus_p20 |
// t1*p01_minus_p21 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fxch %st(2) // t1*p01_minus_p21 | t0*p10_minus_p20 |
// t1*p00_minus_p20 | t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubp %st(0),%st(3) // t0*p10_minus_p20 | t1*p00_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubrp %st(0),%st(1) // t1*p00_minus_p20 - t0*p10_minus_p20 |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fmul %st(2),%st(0) // (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fxch %st(1) // t1*p01_minus_p21 - t0*p11_minus_p21 |
// (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fmul %st(3),%st(0) // (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv |
// (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(1) // (t1*p00_minus_p20 - t0*p10_minus_p20)*
// ystepdenominv |
// (t1*p01_minus_p21 - t0*p11_minus_p21)*
// xstepdenominv | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fistpl C(r_tstepy) // r_tstepx | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fistpl C(r_tstepx) // ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
// t0 = r_p0[5] - r_p2[5];
// t1 = r_p1[5] - r_p2[5];
fildl C(r_p2)+20 // r_p2[5] | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fildl C(r_p0)+20 // r_p0[5] | r_p2[5] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fildl C(r_p1)+20 // r_p1[5] | r_p0[5] | r_p2[5] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fxch %st(2) // r_p2[5] | r_p0[5] | r_p1[5] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fld %st(0) // r_p2[5] | r_p2[5] | r_p0[5] | r_p1[5] |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// p11_minus_p21
fsubrp %st(0),%st(2) // r_p2[5] | t0 | r_p1[5] | ystepdenominv |
// xstepdenominv | p00_minus_p20 | p11_minus_p21
fsubrp %st(0),%st(2) // t0 | t1 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
// r_zistepx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
// xstepdenominv);
// r_zistepy = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
// ystepdenominv);
fld %st(0) // t0 | t0 | t1 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | p11_minus_p21
fmulp %st(0),%st(6) // t0 | t1 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | t0*p11_minus_p21
fxch %st(1) // t1 | t0 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | t0*p11_minus_p21
fld %st(0) // t1 | t1 | t0 | ystepdenominv | xstepdenominv |
// p00_minus_p20 | t0*p11_minus_p21
fmuls p01_minus_p21 // t1*p01_minus_p21 | t1 | t0 | ystepdenominv |
// xstepdenominv | p00_minus_p20 |
// t0*p11_minus_p21
fxch %st(2) // t0 | t1 | t1*p01_minus_p21 | ystepdenominv |
// xstepdenominv | p00_minus_p20 |
// t0*p11_minus_p21
fmuls p10_minus_p20 // t0*p10_minus_p20 | t1 | t1*p01_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// t0*p11_minus_p21
fxch %st(1) // t1 | t0*p10_minus_p20 | t1*p01_minus_p21 |
// ystepdenominv | xstepdenominv | p00_minus_p20 |
// t0*p11_minus_p21
fmulp %st(0),%st(5) // t0*p10_minus_p20 | t1*p01_minus_p21 |
// ystepdenominv | xstepdenominv |
// t1*p00_minus_p20 | t0*p11_minus_p21
fxch %st(5) // t0*p11_minus_p21 | t1*p01_minus_p21 |
// ystepdenominv | xstepdenominv |
// t1*p00_minus_p20 | t0*p10_minus_p20
fsubrp %st(0),%st(1) // t1*p01_minus_p21 - t0*p11_minus_p21 |
// ystepdenominv | xstepdenominv |
// t1*p00_minus_p20 | t0*p10_minus_p20
fxch %st(3) // t1*p00_minus_p20 | ystepdenominv |
// xstepdenominv |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// t0*p10_minus_p20
fsubp %st(0),%st(4) // ystepdenominv | xstepdenominv |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// t1*p00_minus_p20 - t0*p10_minus_p20
fxch %st(1) // xstepdenominv | ystepdenominv |
// t1*p01_minus_p21 - t0*p11_minus_p21 |
// t1*p00_minus_p20 - t0*p10_minus_p20
fmulp %st(0),%st(2) // ystepdenominv |
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