1 2 #if !defined(__PETSCBT_H) 3 #define __PETSCBT_H 4 5 #include <petscconf.h> 6 #include <petscviewer.h> 7 8 /*S 9 PetscBT - PETSc bitarrays 10 11 Level: advanced 12 13 PetscBTCreate(m,&bt) - creates a bit array with enough room to hold m values 14 PetscBTDestroy(&bt) - destroys the bit array 15 PetscBTMemzero(m,bt) - zeros the entire bit array (sets all values to false) 16 PetscBTSet(bt,index) - sets a particular entry as true 17 PetscBTClear(bt,index) - sets a particular entry as false 18 PetscBTLookup(bt,index) - returns the value 19 PetscBTLookupSet(bt,index) - returns the value and then sets it true 20 PetscBTLength(m) - returns number of bytes in array with m bits 21 PetscBTView(m,bt,viewer) - prints all the entries in a bit array 22 23 We do not currently check error flags on PetscBTSet(), PetscBTClear(), PetscBTLookup(), 24 PetcBTLookupSet(), PetscBTLength() cause error checking would cost hundreds more cycles then 25 the operation. 26 27 S*/ 28 typedef char* PetscBT; 29 30 31 PETSC_STATIC_INLINE PetscInt PetscBTLength(PetscInt m) 32 { 33 return ((m)/PETSC_BITS_PER_BYTE+1); 34 } 35 36 PETSC_STATIC_INLINE PetscErrorCode PetscBTMemzero(PetscInt m,PetscBT array) 37 { 38 return PetscMemzero(array,sizeof(char)*((m)/PETSC_BITS_PER_BYTE+1)); 39 } 40 41 PETSC_STATIC_INLINE PetscErrorCode PetscBTDestroy(PetscBT *array) 42 { 43 return PetscFree(*array); 44 } 45 46 PETSC_STATIC_INLINE char PetscBTLookup(PetscBT array,PetscInt index) 47 { 48 char BT_mask,BT_c; 49 PetscInt BT_idx; 50 51 return (BT_idx = (index)/PETSC_BITS_PER_BYTE, 52 BT_c = array[BT_idx], 53 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE), 54 BT_c & BT_mask); 55 } 56 57 PETSC_STATIC_INLINE PetscErrorCode PetscBTView(PetscInt m,const PetscBT bt,PetscViewer viewer) 58 { 59 PetscInt i; 60 PetscErrorCode ierr; 61 62 ierr = PetscViewerASCIIGetStdout(PETSC_COMM_SELF,&viewer);CHKERRQ(ierr); 63 ierr = PetscViewerASCIISynchronizedAllow(viewer,PETSC_TRUE);CHKERRQ(ierr); 64 for (i=0; i<m; i++) { 65 ierr = PetscViewerASCIISynchronizedPrintf(viewer,"%D %d\n",i,PetscBTLookup(bt,i));CHKERRQ(ierr); 66 } 67 ierr = PetscViewerFlush(viewer);CHKERRQ(ierr); 68 ierr = PetscViewerASCIISynchronizedAllow(viewer,PETSC_FALSE);CHKERRQ(ierr); 69 return 0; 70 } 71 72 PETSC_STATIC_INLINE PetscErrorCode PetscBTCreate(PetscInt m,PetscBT *array) 73 { 74 return (PetscMalloc(((m)/PETSC_BITS_PER_BYTE+1)*sizeof(char),array) || PetscBTMemzero(m,*array)); 75 } 76 77 PETSC_STATIC_INLINE char PetscBTLookupSet(PetscBT array,PetscInt index) 78 { 79 char BT_mask,BT_c; 80 PetscInt BT_idx; 81 82 return (BT_idx = (index)/PETSC_BITS_PER_BYTE, 83 BT_c = array[BT_idx], 84 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE), 85 array[BT_idx] = BT_c | BT_mask, 86 BT_c & BT_mask); 87 } 88 89 PETSC_STATIC_INLINE PetscErrorCode PetscBTSet(PetscBT array,PetscInt index) 90 { 91 char BT_mask,BT_c; 92 PetscInt BT_idx; 93 94 BT_idx = (index)/PETSC_BITS_PER_BYTE; 95 BT_c = array[BT_idx]; 96 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE); 97 array[BT_idx] = BT_c | BT_mask; 98 return 0; 99 } 100 101 PETSC_STATIC_INLINE PetscErrorCode PetscBTClear(PetscBT array,PetscInt index) 102 { 103 char BT_mask,BT_c; 104 PetscInt BT_idx; 105 106 BT_idx = (index)/PETSC_BITS_PER_BYTE; 107 BT_c = array[BT_idx]; 108 BT_mask = (char)1 << ((index)%PETSC_BITS_PER_BYTE); 109 array[BT_idx] = BT_c & (~BT_mask); 110 return 0; 111 } 112 113 114 #endif 115