On 2/8/22 21:40, Peter Maydell wrote:
On Tue, 8 Feb 2022 at 07:17, Richard Henderson
<richard.hender...@linaro.org> wrote:
When BH is constant, it is constrained to 10 bits for use in MOVCC.
Where does this happen? I assumed it was going to be done
by the constraint encodings, but tcg_out_addsub2_i64()
is called for the add2_i64 and sub2_i64 ops, which get
return C_O2_I4(r, r, rZ, rZ, rJ, rJ);
and constraint J is
CONST('J', TCG_CT_CONST_S13).
(and indeed there is no "constrain to 10 bits" letter).
Typo/thinko with 10 bit vs 11 bit:
CONST('I', TCG_CT_CONST_S11)
But there are different constraints for add2_i32 and add2_i64:
case INDEX_op_add2_i32:
case INDEX_op_sub2_i32:
return C_O2_I4(r, r, rZ, rZ, rJ, rJ);
...
case INDEX_op_add2_i64:
case INDEX_op_sub2_i64:
return C_O2_I4(R, R, RZ, RZ, RJ, RI);
r~
