Thank Matz.
I'm a bit confused now. As documented and pointed out by grischka
/* only for x86 */
union ldouble_long {
long double ld;
struct {
unsigned long long lower;
unsigned short upper;
} l;
};
ldouble_long should only be used by x86. So far so good.
So I commented out using #if unsigned long long __fixunsxfdi (long double
a1) and, by transitive closure
long long __fixxfdi (long double a1)
{
long long ret; int s;
ret = __fixunsxfdi((s = a1 >= 0) ? a1 : -a1);
return s ? ret : -ret;
}
Which looks to be called by arm-gen.c: func=TOK___fixxfdi;
Is it?
I'm puzzled!! To me, there is a calling chain on ARM that arrives to
__fixunsxfdi which produces an undefined result depending on an
uninitialized variable.
See for example:
# ifndef TCC_ARM_VFP
DEF(TOK___floatdixf, "__floatdixf")
DEF(TOK___fixunssfsi, "__fixunssfsi")
DEF(TOK___fixunsdfsi, "__fixunsdfsi")
DEF(TOK___fixunsxfsi, "__fixunsxfsi")
DEF(TOK___fixxfdi, "__fixxfdi")
# endif
And
#if LDOUBLE_SIZE != 8
else if(r2 == VT_LDOUBLE)
func=TOK___fixxfdi;
else if(r2 == VT_DOUBLE)
#else
else if(r2 == VT_LDOUBLE || r2 == VT_DOUBLE)
#endif
func=TOK___fixdfdi;
}
-----Original Message-----
From: Tinycc-devel [mailto:tinycc-devel-bounces+eligis=orange...@nongnu.org]
On Behalf Of Michael Matz
Sent: samedi 6 mai 2017 07:24
To: tinycc-devel@nongnu.org
Subject: Re: [Tinycc-devel] Annoying new warning
Hi,
On Sat, 6 May 2017, Christian Jullien wrote:
> Using your advice, I added #if !defined(TCC_TARGET_ARM) around all
> code directly or indirectly using ldouble_long which solved warning.
But you now also ifdefed out __fixunsdfdi and __fixdfdi. That can't work,
they are called from the backend:
> +#if !defined(TCC_TARGET_ARM)
Here you start the ifdef ...
> unsigned long long __fixunsdfdi (double a1)
... so this, ...
> {
> register union double_long dl1;
> @@ -598,24 +601,25 @@ unsigned long long __fixunsxfdi (long double a1)
> return 0;
> }
>
> -long long __fixsfdi (float a1)
> +long long __fixdfdi (double a1)
... this ...
> -long long __fixdfdi (double a1)
> +long long __fixxfdi (long double a1)
... and this are commented out. Only the last one and __fixunsxfdi should
be.
Ciao,
Michael.
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