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 PetscBTLookupClear(bt,index) - returns the value and then sets it false 21 PetscBTLength(m) - returns number of bytes in array with m bits 22 PetscBTView(m,bt,viewer) - prints all the entries in a bit array 23 24 We do not currently check error flags on PetscBTSet(), PetscBTClear(), PetscBTLookup(), 25 PetcBTLookupSet(), PetscBTLength() cause error checking would cost hundreds more cycles then 26 the operation. 27 28 S*/ 29 typedef char* PetscBT; 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)*((size_t)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 BT_idx = index/PETSC_BITS_PER_BYTE; 52 BT_c = array[BT_idx]; 53 BT_mask = (char)(1 << index%PETSC_BITS_PER_BYTE); 54 return (char)(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 if (!viewer) {ierr = PetscViewerASCIIGetStdout(PETSC_COMM_SELF,&viewer);CHKERRQ(ierr);} 63 ierr = PetscViewerASCIIPushSynchronized(viewer);CHKERRQ(ierr); 64 for (i=0; i<m; i++) { 65 ierr = PetscViewerASCIISynchronizedPrintf(viewer,"%D %d\n",i,(int)PetscBTLookup(bt,i));CHKERRQ(ierr); 66 } 67 ierr = PetscViewerFlush(viewer);CHKERRQ(ierr); 68 ierr = PetscViewerASCIIPopSynchronized(viewer);CHKERRQ(ierr); 69 return 0; 70 } 71 72 PETSC_STATIC_INLINE PetscErrorCode PetscBTCreate(PetscInt m,PetscBT *array) 73 { 74 return PetscMalloc1((size_t)m/PETSC_BITS_PER_BYTE+1,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 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] = (char)(BT_c | BT_mask); 86 return (char)(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] = (char)(BT_c | BT_mask); 98 return 0; 99 } 100 101 PETSC_STATIC_INLINE PetscErrorCode PetscBTNegate(PetscBT array,PetscInt index) 102 { 103 const PetscInt BT_idx = index/PETSC_BITS_PER_BYTE; 104 const char BT_mask = (char)(1 << index%PETSC_BITS_PER_BYTE); 105 106 array[BT_idx] ^= BT_mask; 107 return 0; 108 } 109 110 PETSC_STATIC_INLINE char PetscBTLookupClear(PetscBT array,PetscInt index) 111 { 112 char BT_mask,BT_c; 113 PetscInt BT_idx; 114 115 BT_idx = index/PETSC_BITS_PER_BYTE; 116 BT_c = array[BT_idx]; 117 BT_mask = (char)(1 << index%PETSC_BITS_PER_BYTE); 118 array[BT_idx] = (char)(BT_c & ~BT_mask); 119 return (char)(BT_c & BT_mask); 120 } 121 122 PETSC_STATIC_INLINE PetscErrorCode PetscBTClear(PetscBT array,PetscInt index) 123 { 124 char BT_mask,BT_c; 125 PetscInt BT_idx; 126 127 BT_idx = index/PETSC_BITS_PER_BYTE; 128 BT_c = array[BT_idx]; 129 BT_mask = (char)(1 << index%PETSC_BITS_PER_BYTE); 130 array[BT_idx] = (char)(BT_c & ~BT_mask); 131 return 0; 132 } 133 134 #endif 135