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ubsan: loongarch : signed integer shift overflow.

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opcodes/
	* loongarch-coder.c :
	  int32_t ret = 0;
	  ret <<= sizeof (ret) * 8 - len;
	  ret >>= sizeof (ret) * 8 - len;
	  ...
	  Avoid ubsan warning.
This commit is contained in:
liuzhensong 2021-11-16 19:15:29 +08:00
parent 1ab7a698a8
commit e36144c932
1 changed files with 9 additions and 6 deletions
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15
opcodes/loongarch-coder.c
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@ -106,11 +106,13 @@ loongarch_decode_imm (const char *bit_field, insn_t insn, int si)
else if (*bit_field_1 == '+')
ret += atoi (bit_field_1 + 1);
/* Extend signed bit. */
if (si)
{
ret <<= sizeof (ret) * 8 - len;
ret >>= sizeof (ret) * 8 - len;
uint32_t sign = 1u << (len - 1);
ret = (ret ^ sign) - sign;
}
return ret;
}
@ -133,7 +135,8 @@ loongarch_encode_imm (const char *bit_field, int32_t imm)
else if (*t == '+')
uimm -= atoi (t + 1);
uimm <<= sizeof (uimm) * 8 - width;
uimm = width ? (uimm << (sizeof (uimm) * 8 - width)) : 0;
while (1)
{
b_start = strtol (bit_field_1, &bit_field_1, 10);
@ -141,10 +144,10 @@ loongarch_encode_imm (const char *bit_field, int32_t imm)
break;
width = strtol (bit_field_1 + 1, &bit_field_1, 10);
i = uimm;
i >>= sizeof (i) * 8 - width;
i <<= b_start;
i = width ? (i >> (sizeof (i) * 8 - width)) : 0;
i = (b_start == 32) ? 0 : (i << b_start);
ret |= i;
uimm <<= width;
uimm = (width == 32) ? 0 : (uimm << width);
if (*bit_field_1 != '|')
break;