retitle 105622 [m68k] Generates invalid asm instruction with -O2
thanks
OK, here is the test case. I stripped out everything specific to Hercules, and
removed as many statements as possible. If I change pretty much any of what's
left, the bug doesn't occur. To reproduce:
[EMAIL PROTECTED]:/unstable/build/mdz/hercules-2.12$ cc -O2 -c test.c
/tmp/cc23gVSZ.s: Assembler messages:
/tmp/cc23gVSZ.s:69: Error: operands mismatch -- statement `add.l %a4,-20(%a6)'
ignored
[EMAIL PROTECTED]:/unstable/build/mdz/hercules-2.12$ cc -O1 -c test.c
[EMAIL PROTECTED]:/unstable/build/mdz/hercules-2.12$
The same code compiles fine with -O2 on i386.
Versions used:
gcc 2.95.3-7
gcc-2.95 2.95.4-0.010604
libc6 2.2.3-5
cpp-2.95 2.95.4-0.010604
binutils 2.11.90.0.7-2
--
- mdz
typedef unsigned int U32;
typedef unsigned long long U64;
typedef unsigned char BYTE;
typedef struct _EXTENDED_FLOAT {
U64 ms_fract, ls_fract; /* Fraction */
short expo; /* Exponent + 64 */
BYTE sign; /* Sign */
} EXTENDED_FLOAT;
static void func(EXTENDED_FLOAT *p) {};
void mul_ef( EXTENDED_FLOAT *fl, EXTENDED_FLOAT *mul_fl)
{
U64 wk1;
U64 wk2;
U64 wk3;
U64 wk;
U32 wk0;
/* some function call here is necessary to reproduce the bug */
func(mul_fl);
wk0 = ((fl->ls_fract & 0x00000000FFFFFFFFULL) * (mul_fl->ls_fract & 0x00000000FFFFFFFFULL)) >> 32;
wk = wk0 + (wk1 & 0x00000000FFFFFFFFULL) + (wk2 & 0x00000000FFFFFFFFULL);
wk = (wk >> 32) + (wk1 >> 32) + (wk2 >> 32);
wk1 = (fl->ls_fract & 0x00000000FFFFFFFFULL) * (mul_fl->ms_fract & 0x00000000FFFFFFFFULL);
wk3 = (fl->ms_fract & 0x00000000FFFFFFFFULL) * (mul_fl->ls_fract & 0x00000000FFFFFFFFULL);
wk2 = (fl->ls_fract >> 32) * (mul_fl->ms_fract & 0x00000000FFFFFFFFULL);
wk2 = (fl->ms_fract & 0x00000000FFFFFFFFULL) * (mul_fl->ms_fract & 0x00000000FFFFFFFFULL);
wk += ((wk1 & 0x00000000FFFFFFFFULL) + (wk2 & 0x00000000FFFFFFFFULL) + (wk3 & 0x00000000FFFFFFFFULL));
fl->ls_fract = wk & 0x00000000FFFFFFFFULL;
} /* end function mul_ef */
/* end of float.c */
