144    float *r0, *r1, *r2, *r3;  in util_invert_mat4x4()  local
154    r0 = wtmp[0], r1 = wtmp[1], r2 = wtmp[2], r3 = wtmp[3];  in util_invert_mat4x4()
156    r0[0] = MAT(m, 0, 0), r0[1] = MAT(m, 0, 1), r0[2] = MAT(m, 0, 2), r0[3] = MAT(m, 0, 3),  in util_invert_mat4x4()
157    r0[4] = 1.0, r0[5] = r0[6] = r0[7] = 0.0,  in util_invert_mat4x4()
173    if (fabsf(r1[0]) > fabsf(r0[0]))  in util_invert_mat4x4()
174       SWAP_ROWS(r1, r0);  in util_invert_mat4x4()
175    if (0.0F == r0[0])  in util_invert_mat4x4()
179    m1 = r1[0] / r0[0];  in util_invert_mat4x4()
180    m2 = r2[0] / r0[0];  in util_invert_mat4x4()
181    m3 = r3[0] / r0[0];  in util_invert_mat4x4()
182    s = r0[1];  in util_invert_mat4x4()
186    s = r0[2];  in util_invert_mat4x4()
190    s = r0[3];  in util_invert_mat4x4()
194    s = r0[4];  in util_invert_mat4x4()
200    s = r0[5];  in util_invert_mat4x4()
206    s = r0[6];  in util_invert_mat4x4()
212    s = r0[7];  in util_invert_mat4x4()
282    m0 = r0[3];  in util_invert_mat4x4()
283    r0[4] -= r3[4] * m0, r0[5] -= r3[5] * m0, r0[6] -= r3[6] * m0, r0[7] -= r3[7] * m0;  in util_invert_mat4x4()
289    m0 = r0[2];  in util_invert_mat4x4()
290    r0[4] -= r2[4] * m0, r0[5] -= r2[5] * m0, r0[6] -= r2[6] * m0, r0[7] -= r2[7] * m0;  in util_invert_mat4x4()
292    m0 = r0[1]; /* now back substitute row 0 */  in util_invert_mat4x4()
293    s = 1.0F / r0[0];  in util_invert_mat4x4()
294    r0[4] = s * (r0[4] - r1[4] * m0), r0[5] = s * (r0[5] - r1[5] * m0),  in util_invert_mat4x4()
295    r0[6] = s * (r0[6] - r1[6] * m0), r0[7] = s * (r0[7] - r1[7] * m0);  in util_invert_mat4x4()
297    MAT(out, 0, 0) = r0[4];  in util_invert_mat4x4()
298    MAT(out, 0, 1) = r0[5], MAT(out, 0, 2) = r0[6];  in util_invert_mat4x4()
299    MAT(out, 0, 3) = r0[7], MAT(out, 1, 0) = r1[4];  in util_invert_mat4x4()