1 2 #if !defined(__PETSCBT_H) 3 #define __PETSCBT_H 4 5 /*S 6 PetscBT - PETSc bitarrays 7 8 Level: advanced 9 10 PetscBTCreate(m,&bt) - creates a bit array with enough room to hold m values 11 PetscBTDestroy(&bt) - destroys the bit array 12 PetscBTMemzero(m,bt) - zeros the entire bit array (sets all values to false) 13 PetscBTSet(bt,index) - sets a particular entry as true 14 PetscBTClear(bt,index) - sets a particular entry as false 15 PetscBTLookup(bt,index) - returns the value 16 PetscBTLookupSet(bt,index) - returns the value and then sets it true 17 PetscBTLength(m) - returns number of bytes in array with m bits 18 PetscBTView(m,bt,viewer) - prints all the entries in a bit array 19 20 We do not currently check error flags on PetscBTSet(), PetscBTClear(), PetscBTLookup(), 21 PetcBTLookupSet(), PetscBTLength() cause error checking would cost hundreds more cycles then 22 the operation. 23 24 S*/ 25 typedef char* PetscBT; 26 27 28 PETSC_STATIC_INLINE PetscInt PetscBTLength(PetscInt m) 29 { 30 return ((m)/PETSC_BITS_PER_BYTE+1); 31 } 32 33 PETSC_STATIC_INLINE PetscErrorCode PetscBTMemzero(PetscInt m,PetscBT array) 34 { 35 return PetscMemzero(array,sizeof(char)*((m)/PETSC_BITS_PER_BYTE+1)); 36 } 37 38 PETSC_STATIC_INLINE PetscErrorCode PetscBTDestroy(PetscBT *array) 39 { 40 return PetscFree(*array); 41 } 42 43 PETSC_STATIC_INLINE char PetscBTLookup(PetscBT array,PetscInt index) 44 { 45 char BT_mask,BT_c; 46 PetscInt BT_idx; 47 48 return (BT_idx = (index)/PETSC_BITS_PER_BYTE, 49 BT_c = array[BT_idx], 50 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE), 51 BT_c & BT_mask); 52 } 53 54 PETSC_STATIC_INLINE PetscErrorCode PetscBTView(PetscInt m,const PetscBT bt,PetscViewer viewer) 55 { 56 PetscInt i; 57 PetscErrorCode ierr; 58 59 if (!viewer) viewer = PETSC_VIEWER_STDOUT_SELF; 60 ierr = PetscViewerASCIISynchronizedAllow(viewer,PETSC_TRUE);CHKERRQ(ierr); 61 for (i=0; i<m; i++) { 62 ierr = PetscViewerASCIISynchronizedPrintf(viewer,"%D %d\n",i,PetscBTLookup(bt,i));CHKERRQ(ierr); 63 } 64 ierr = PetscViewerFlush(viewer);CHKERRQ(ierr); 65 ierr = PetscViewerASCIISynchronizedAllow(viewer,PETSC_FALSE);CHKERRQ(ierr); 66 return 0; 67 } 68 69 PETSC_STATIC_INLINE PetscErrorCode PetscBTCreate(PetscInt m,PetscBT *array) 70 { 71 return (PetscMalloc(((m)/PETSC_BITS_PER_BYTE+1)*sizeof(char),array) || PetscBTMemzero(m,*array)); 72 } 73 74 PETSC_STATIC_INLINE char PetscBTLookupSet(PetscBT array,PetscInt index) 75 { 76 char BT_mask,BT_c; 77 PetscInt BT_idx; 78 79 return (BT_idx = (index)/PETSC_BITS_PER_BYTE, 80 BT_c = array[BT_idx], 81 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE), 82 array[BT_idx] = BT_c | BT_mask, 83 BT_c & BT_mask); 84 } 85 86 PETSC_STATIC_INLINE PetscErrorCode PetscBTSet(PetscBT array,PetscInt index) 87 { 88 char BT_mask,BT_c; 89 PetscInt BT_idx; 90 91 BT_idx = (index)/PETSC_BITS_PER_BYTE; 92 BT_c = array[BT_idx]; 93 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE); 94 array[BT_idx] = BT_c | BT_mask; 95 return 0; 96 } 97 98 PETSC_STATIC_INLINE PetscErrorCode PetscBTClear(PetscBT array,PetscInt index) 99 { 100 char BT_mask,BT_c; 101 PetscInt BT_idx; 102 103 BT_idx = (index)/PETSC_BITS_PER_BYTE; 104 BT_c = array[BT_idx]; 105 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE); 106 array[BT_idx] = BT_c & (~BT_mask); 107 return 0; 108 } 109 110 111 #endif 112