2: /********************************bit_mask.c************************************

  4: Author: Henry M. Tufo III

  6: e-mail: hmt@cs.brown.edu

  8: snail-mail:
  9: Division of Applied Mathematics
 10: Brown University
 11: Providence, RI 02912

 13: Last Modification:
 14: 11.21.97
 15: *********************************bit_mask.c***********************************/
 16:  #include <../src/ksp/pc/impls/tfs/tfs.h>


 19: /*********************************bit_mask.c***********************************/
 20: PetscErrorCode PCTFS_bm_to_proc(char *ptr, PetscInt p_mask,  PetscInt *msg_list)
 21: {
 22:   PetscInt i, tmp;

 25:   if (msg_list) {
 26:     /* low to high */
 27:     ptr+=(p_mask-1);
 28:     for (i=p_mask-1;i>=0;i--) {
 29:       tmp = BYTE*(p_mask-i-1);
 30:       if (*ptr&BIT_0) {
 31:         *msg_list = tmp; msg_list++;
 32:       }
 33:       if (*ptr&BIT_1) {
 34:         *msg_list = tmp+1; msg_list++;
 35:       }
 36:       if (*ptr&BIT_2) {
 37:         *msg_list = tmp+2; msg_list++;
 38:       }
 39:       if (*ptr&BIT_3) {
 40:         *msg_list = tmp+3; msg_list++;
 41:       }
 42:       if (*ptr&BIT_4) {
 43:         *msg_list = tmp+4; msg_list++;
 44:       }
 45:       if (*ptr&BIT_5) {
 46:         *msg_list = tmp+5; msg_list++;
 47:       }
 48:       if (*ptr&BIT_6) {
 49:         *msg_list = tmp+6; msg_list++;
 50:       }
 51:       if (*ptr&BIT_7) {
 52:         *msg_list = tmp+7; msg_list++;
 53:       }
 54:       ptr--;
 55:     }
 56:   }
 57:   return(0);
 58: }

 60: /*********************************bit_mask.c***********************************/
 61: PetscInt PCTFS_ct_bits(char *ptr, PetscInt n)
 62: {
 63:   PetscInt i, tmp=0;

 65:   for (i=0;i<n;i++) {
 66:     if (*ptr&128) tmp++;
 67:     if (*ptr&64)  tmp++;
 68:     if (*ptr&32)  tmp++;
 69:     if (*ptr&16)  tmp++;
 70:     if (*ptr&8)   tmp++;
 71:     if (*ptr&4)   tmp++;
 72:     if (*ptr&2)   tmp++;
 73:     if (*ptr&1)   tmp++;
 74:     ptr++;
 75:   }
 76:   return(tmp);
 77: }

 79: /*********************************bit_mask.c***********************************/
 80: PetscInt PCTFS_div_ceil(PetscInt numer,  PetscInt denom)
 81: {
 82:   PetscInt rt_val;

 84:   if ((numer<0)||(denom<=0)) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_PLIB,"PCTFS_div_ceil() :: numer=%D ! >=0, denom=%D ! >0",numer,denom);

 86:   /* if integer division remainder then increment */
 87:   rt_val = numer/denom;
 88:   if (numer%denom) rt_val++;
 89:   return(rt_val);
 90: }

 92: /*********************************bit_mask.c***********************************/
 93: PetscInt PCTFS_len_bit_mask(PetscInt num_items)
 94: {
 95:   PetscInt rt_val, tmp;

 97:   if (num_items<0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Value Sent To PCTFS_len_bit_mask() Must be >= 0!");

 99:   /* mod BYTE ceiling function */
100:   rt_val = num_items/BYTE;
101:   if (num_items%BYTE) rt_val++;
102:   /* make mults of sizeof int */
103:   if ((tmp=rt_val%sizeof(PetscInt))) rt_val+=(sizeof(PetscInt)-tmp);
104:   return(rt_val);
105: }

107: /*********************************bit_mask.c***********************************/
108: PetscErrorCode PCTFS_set_bit_mask(PetscInt *bm, PetscInt len, PetscInt val)
109: {
110:   PetscInt i, offset;
111:   char     mask = 1;
112:   char     *cptr;

115:   if (PCTFS_len_bit_mask(val)>len) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"The Bit Mask Isn't That Large!");

117:   cptr = (char*) bm;

119:   offset = len/sizeof(PetscInt);
120:   for (i=0; i<offset; i++) {
121:     *bm=0;
122:     bm++;
123:   }

125:   offset = val%BYTE;
126:   for (i=0;i<offset;i++) {
127:     mask <<= 1;
128:   }

130:   offset       = len - val/BYTE - 1;
131:   cptr[offset] = mask;
132:   return(0);
133: }

135: /*********************************bit_mask.c***********************************/
136: PetscInt PCTFS_len_buf(PetscInt item_size, PetscInt num_items)
137: {
138:   PetscInt rt_val, tmp;

140:   rt_val = item_size * num_items;

142:   /*  double precision align for now ... consider page later */
143:   if ((tmp = (rt_val%(PetscInt)sizeof(double)))) rt_val += (sizeof(double) - tmp);
144:   return(rt_val);
145: }