kvx: ubsan: integer overflow
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Commit Message
This fixes a few places where ubsan complains about signed integer
overflow when running the testsuite, and that clz(0) is undefined.
When fixing the clz problem, I also noticed that we'd get complaints
if pval is ever LLONG_MIN. Fix that by using unsigned arithmetic.
* config/kvx-parse.c (get_token_class): Avoid signed overflow.
Don't clz(0).
* config/tc-kvx.c (PARALLEL_BIT): Avoid signed overflow.
@@ -515,9 +515,9 @@ get_token_class (struct token_s *token, struct token_classes *classes, int insn_
? token->val
: strtoull (tok + (tok[0] == '-') + (tok[0] == '+'), NULL, 0);
long long val = uval;
- long long pval = val < 0 ? -val : val;
- int neg_power2_p = val < 0 && !(pval & (pval - 1));
- unsigned int len = 8 * sizeof (pval) - __builtin_clzll (pval);
+ long long pval = val < 0 ? -uval : uval;
+ int neg_power2_p = val < 0 && !(uval & (uval - 1));
+ unsigned len = pval ? 8 * sizeof (pval) - __builtin_clzll (pval) : 0;
for (; class[cur].class_id != -1
&& ((unsigned int) (class[cur].sz < 0 ? - class[cur].sz - !neg_power2_p : class[cur].sz) < len
|| (exp.X_op == O_symbol && !has_relocation_of_size (str_hash_find (env.reloc_hash, TOKEN_NAME (class[cur].class_id))))
@@ -49,7 +49,7 @@ static void supported_cores (char buf[], size_t buflen);
#define STRNEQ(x,y,n) !strncmp(((x) ? (x) : ""), ((y) ? (y) : ""),(n))
/* The PARALLEL_BIT is set to 0 when an instruction is the last of a bundle. */
-#define PARALLEL_BIT (1 << 31)
+#define PARALLEL_BIT (1u << 31)
/*TB begin*/
int size_type_function = 1;