https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111720
--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> --- On Thu, 19 Oct 2023, juzhe.zhong at rivai dot ai wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111720 > > --- Comment #19 from JuzheZhong <juzhe.zhong at rivai dot ai> --- > (In reply to Richard Biener from comment #18) > > With RVV you have intrinsic calls in GIMPLE so nothing to optimize: > > > > vbool8_t fn () > > { > > vbool8_t vmask; > > vuint8m1_t vand_m; > > vuint8m1_t varr; > > uint8_t arr[32]; > > > > <bb 2> [local count: 1073741824]: > > arr = > > "\x01\x02\x07\x01\x03\x04\x05\x03\x01\x00\x01\x02\x04\x04\t\t\x01\x02\x07\x01 > > \x03\x04\x05\x03\x01\x00\x01\x02\x04\x04\t\t"; > > varr_3 = __riscv_vle8_v_u8m1 (&arr, 32); [return slot optimization] > > vand_m_4 = __riscv_vand_vx_u8m1 (varr_3, 1, 32); [return slot > > optimization] > > vmask_5 = __riscv_vreinterpret_v_u8m1_b8 (vand_m_4); [return slot > > optimization] > > <retval> = vmask_5; > > arr ={v} {CLOBBER(eol)}; > > return <retval>; > > > > and on RTL I see lots of UNSPECs, RTL opts cannot do anything with those. > > > > This is what Andrew said already. > > Ok. I wonder why this issue is gone when I change it into: > > arr as static > > https://godbolt.org/z/Tdoshdfr6 Because the stacik initialization isn't required then.
