https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97417
Levy <admin at levyhsu dot com> changed:
What |Removed |Added
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CC| |admin at levyhsu dot com
--- Comment #6 from Levy <admin at levyhsu dot com> ---
Hi Jim
Levy from StarFive.
Adding following code to the head of riscv_legitimize_move() according to your
reply seems to solve the problem:
if(mode == QImode && MEM_P (src) && REG_P (dest))
{
rtx temp_reg;
if (TARGET_64BIT)
{
temp_reg = gen_reg_rtx (DImode);
emit_insn(gen_zero_extendqidi2(temp_reg, src));
}
else
{
temp_reg = gen_reg_rtx (SImode);
emit_insn(gen_zero_extendqisi2(temp_reg, src));
}
riscv_emit_move(dest, gen_rtx_SUBREG(QImode,temp_reg,0));
return true;
}
same foo.c will produce:
foo:
lui a5,%hi(active)
lbu a5,%lo(active)(a5)
li a0,42
bne a5,zero,.L6
ret
.L6:
li a0,-42
ret
.size foo, .-foo
.ident "GCC: (GNU) 10.2.0"
Not sure if I'm doing it right, especially for 64bit DImode because I've only
been with gcc for a month. Just wonder if you have time after Monday's compiler
meeting so we may discuss movsi, movhi and MEM to MEM copy.
