https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89502
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
rtx
memory_address_addr_space (machine_mode mode, rtx x, addr_space_t as)
{
rtx oldx = x;
scalar_int_mode address_mode = targetm.addr_space.address_mode (as);
x = convert_memory_address_addr_space (address_mode, x, as);
/* By passing constant addresses through registers
we get a chance to cse them. */
if (! cse_not_expected && CONSTANT_P (x) && CONSTANT_ADDRESS_P (x))
x = force_reg (address_mode, x);
cprop undoes it, which isn't enabled by O1. For x86, using register
instead of a 32-bit constant usually is a performance loss. Shouldn't
backend have a choice here?
