http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49028
--- Comment #1 from Piotr Wyderski <piotr.wyderski at gmail dot com> 2011-05-17
17:24:03 UTC ---
If I change the function to:
template <unsigned int N> void R<N>::xxx_release(void* p) {
char* q = reinterpret_cast<char*>(m_Cursor);
char* b = reinterpret_cast<char*>(m_Data);
q = ((q + sizeof(void*)) - b) % (N * sizeof(void*)) + b;
m_Cursor = reinterpret_cast<void**>(q);
*m_Cursor = p;
}
Then the generated code is:
000000000041a910 <_ZN1RILj16EE11xxx_releaseEPv>:
41a910: 48 8b 87 80 00 00 00 mov 0x80(%rdi),%rax
41a917: 48 83 c0 08 add $0x8,%rax
41a91b: 48 29 f8 sub %rdi,%rax
41a91e: 83 e0 7f and $0x7f,%eax
41a921: 48 01 f8 add %rdi,%rax
41a924: 48 89 87 80 00 00 00 mov %rax,0x80(%rdi)
41a92b: 48 89 30 mov %rsi,(%rax)
41a92e: c3 retq
which is astonishingly close to my hand-made assembly...
