https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118166
Bug ID: 118166
Summary: simple bit operations for __int128 do not use vector
operations/registers
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gero.peterhoff at gmx dot net
Target Milestone: ---
Example
__int128 bit_blend(const __int128 if_false, const __int128 if_true, const
__int128 mask)
{
return ((if_false ^ if_true) & mask) ^ if_false;
}
generated (-std=gnu++23 -msse2 (or better) -O3)
bit_blend(__int128, __int128, __int128):
xchg rdi, rsi
mov rax, rdx
mov rdx, rcx
xor rax, rsi
xor rdx, rdi
and rax, r8
and rdx, r9
xor rax, rsi
xor rdx, rdi
ret
