1 //------------------------------------------------------------------------------
2 // GB_mx_xsame32: check if two FP32 arrays are equal (ignoring zombies)
3 //------------------------------------------------------------------------------
4
5 // SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2021, All Rights Reserved.
6 // SPDX-License-Identifier: Apache-2.0
7
8 //------------------------------------------------------------------------------
9
10 #include "GB_mex.h"
11
GB_mx_xsame32(float * X,float * Y,int8_t * Xb,int64_t len,int64_t * I,float eps)12 bool GB_mx_xsame32 // true if arrays X and Y are the same (ignoring zombies)
13 (
14 float *X,
15 float *Y,
16 int8_t *Xb, // bitmap of X and Y (NULL if no bitmap)
17 int64_t len, // length of X and Y
18 int64_t *I, // row indices (for zombies), same length as X and Y
19 float eps // error tolerance allowed (eps > 0)
20 )
21 {
22 if (X == Y) return (true) ;
23 if (X == NULL) return (false) ;
24 if (Y == NULL) return (false) ;
25 for (int64_t i = 0 ; i < len ; i++)
26 {
27 if (Xb != NULL && Xb [i] == 0)
28 {
29 // ignore X [i] and Y [i] if they are not in the bitmap
30 continue ;
31 }
32 // check X [i] and Y [i], but ignore zombies
33 if (I == NULL || I [i] >= 0)
34 {
35 int c = fpclassify (X [i]) ;
36 if (c != fpclassify (Y [i])) return (false) ;
37 if (c == FP_ZERO)
38 {
39 // both are zero, which is OK
40 }
41 else if (c == FP_INFINITE)
42 {
43 // + or -infinity
44 if (X [i] != Y [i]) return (false) ;
45 }
46 else if (c != FP_NAN)
47 {
48 // both are normal or subnormal, and nonzero
49 float err = fabsf (X [i] - Y [i]) / fabsf (X [i]) ;
50 if (err > eps) return (false) ;
51 }
52 }
53 }
54 return (true) ;
55 }
56
57