http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48598
Summary: x86 backend fails to properly mark memory alignment
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: hjl.to...@gmail.com
[hjl@gnu-6 pr1000]$ cat p.i
extern const unsigned char __popcount_tab[256];
int
__popcountdi2 (unsigned long long x)
{
int i, ret = 0;
for (i = 0; i < (8 * 8); i += 8)
ret += __popcount_tab[(x >> i) & 0xff];
return ret;
}
[hjl@gnu-6 pr1000]$ gcc -O2 -fPIC p.i -S -da
(insn 19 18 20 (set (reg/f:DI 108)
(mem/u/c:DI (const:DI (unspec:DI [
(symbol_ref:DI ("__popcount_tab") [flags 0x40]
<var_dec
l 0x7ffff210e000 __popcount_tab>)
] UNSPEC_GOTPCREL)) [2 S8 A8])) p.i:8 -1
(nil))
__popcount_tab should be marked with 64bit alignment.
