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i386-asm.c: Optional % for variables in specific registers

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Handle 'register long r10 __asm__("%r10")' without %, too. Using GCC
the % is optional. The musl source code does not use the % prefix.
The GCC source code uses both variants.
This commit is contained in:
Stefan 2025-09-21 12:36:46 +02:00
parent 5aebf106e8
commit 95d184cba1
1 changed files with 7 additions and 6 deletions
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13
i386-asm.c
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@ -1233,8 +1233,8 @@ static const char *skip_constraint_modifiers(const char *p)
return p; return p;
} }
/* If T (a token) is of the form "%reg" returns the register /* If t (a token) is of the form "%reg" or "reg" return the register number and
number and type, otherwise return -1. */ type, otherwise return -1. With GCC the % is optional, too. */
ST_FUNC int asm_parse_regvar (int t) ST_FUNC int asm_parse_regvar (int t)
{ {
const char *s; const char *s;
@ -1242,13 +1242,14 @@ ST_FUNC int asm_parse_regvar (int t)
if (t < TOK_IDENT || (t & SYM_FIELD)) if (t < TOK_IDENT || (t & SYM_FIELD))
return -1; return -1;
s = table_ident[t - TOK_IDENT]->str; s = table_ident[t - TOK_IDENT]->str;
if (s[0] != '%') if (s[0] == '%')
return -1; ++s;
t = tok_alloc_const(s + 1); t = tok_alloc_const(s);
unget_tok(t); unget_tok(t);
/* Internally the % prefix is required. */
unget_tok('%'); unget_tok('%');
parse_operand(tcc_state, &op); parse_operand(tcc_state, &op);
/* Accept only integer regs for now. */ /* Accept only integer regs for now. */
if (op.type & OP_REG) if (op.type & OP_REG)
return op.reg; return op.reg;
else else