https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89809
JunMa <JunMa at linux dot alibaba.com> changed:
What |Removed |Added
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CC| |JunMa at linux dot alibaba.com
--- Comment #2 from JunMa <JunMa at linux dot alibaba.com> ---
g++ pr89809.cpp -O3 -fdump-tree-store-merging:
foo (const unsigned char * p)
{
unsigned char _1;
signed short _2;
unsigned char _3;
int _4;
int _5;
signed short _6;
signed short _7;
uint16_t _10;
<bb 2> [local count: 1073741824]:
_1 = *p_9(D);
_2 = (signed short) _1;
_3 = MEM[(const unsigned char *)p_9(D) + 1B];
_4 = (int) _3;
_5 = _4 << 8;
_6 = (signed short) _5;
_7 = _2 | _6;
_10 = (uint16_t) _7;
return _10;
}
looks like gcc generates too many type conversions, this prevents the
optimization.
