diff options
Diffstat (limited to 'src/H5detect.c')
| -rw-r--r-- | src/H5detect.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/src/H5detect.c b/src/H5detect.c index 4490fb5..29955a1 100644 --- a/src/H5detect.c +++ b/src/H5detect.c @@ -119,9 +119,9 @@ static volatile int nd_g = 0, na_g = 0; static void print_results(int nd, detected_t *d, int na, malign_t *m); static void iprint(detected_t *); static int byte_cmp(int, const void *, const void *); -static int bit_cmp(int, int *, void *, void *); +static int bit_cmp(int, int *, volatile void *, volatile void *); static void fix_order(int, int, int, int *, const char **); -static int imp_bit(int, int *, void *, void *); +static int imp_bit(int, int *, volatile void *, volatile void *); static unsigned long find_bias(int, int, int *, void *); static void precision (detected_t*); static void print_header(void); @@ -279,6 +279,9 @@ precision (detected_t *d) * absence of implicit mantissa bit, and exponent bias and * initializes a detected_t structure with those properties. * + * Note: 'volatile' is used for the variables below to prevent the + * compiler from optimizing them away. + * * Return: void * * Programmer: Robb Matzke @@ -927,11 +930,11 @@ byte_cmp(int n, const void *_a, const void *_b) *------------------------------------------------------------------------- */ static int -bit_cmp(int nbytes, int *perm, void *_a, void *_b) +bit_cmp(int nbytes, int *perm, volatile void *_a, volatile void *_b) { int i, j; - unsigned char *a = (unsigned char *) _a; - unsigned char *b = (unsigned char *) _b; + volatile unsigned char *a = (volatile unsigned char *) _a; + volatile unsigned char *b = (volatile unsigned char *) _b; unsigned char aa, bb; for (i = 0; i < nbytes; i++) { @@ -1048,10 +1051,10 @@ fix_order(int n, int first, int last, int *perm, const char **mesg) *------------------------------------------------------------------------- */ static int -imp_bit(int n, int *perm, void *_a, void *_b) +imp_bit(int n, int *perm, volatile void *_a, volatile void *_b) { - unsigned char *a = (unsigned char *) _a; - unsigned char *b = (unsigned char *) _b; + volatile unsigned char *a = (volatile unsigned char *) _a; + volatile unsigned char *b = (volatile unsigned char *) _b; int changed, major, minor; int msmb; /*most significant mantissa bit */ |