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From: Gustavo Romero <gromero@linux.vnet.ibm.com>
Subject: ppc64el float handling fix
I dug a bit further and it looks like that sam_parse1() is actually
generating a different value for the floats in question, so when they are
loaded back for the comparison they are already screwed up
because strtod() is used in float_to_le() and so also in u32_to_le(), which are
inlined and float_to_le() takes a float and not a double as the first argument
the use strtof() instead of strtod() in there looks the best, avoiding a
truncation from double to float, which might cause precision issues, specially
between different archs (like casts) plus optimization. So the following
change fixed the issue for me.
Index: htslib/sam.c
===================================================================
--- htslib.orig/sam.c
+++ htslib/sam.c
@@ -2570,7 +2570,7 @@ static char *sam_parse_Bf_vals(bam1_t *b
if (grow_B_array(b, nalloc, 4) < 0)
return NULL;
}
- float_to_le(strtod(q + 1, &q), b->data + b->l_data);
+ float_to_le(strtof(q + 1, &q), b->data + b->l_data);
b->l_data += 4;
}
return q;
@@ -2835,7 +2835,7 @@ static inline int aux_parse(char *start,
}
} else if (type == 'f') {
b->data[b->l_data++] = 'f';
- float_to_le(strtod(q, &q), b->data + b->l_data);
+ float_to_le(strtof(q, &q), b->data + b->l_data);
b->l_data += sizeof(float);
} else if (type == 'd') {
b->data[b->l_data++] = 'd';
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