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tcg/optimize: Fold dup2_vec

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When the two arguments are identical, this can be reduced to
dup_vec or to mov_vec from a tcg_constant_vec.

Backports commit 1dc4fe70128db05237a00eda6eb15e2b44deb31f
This commit is contained in:
Richard Henderson 2021-03-01 19:46:13 -05:00 committed by Lioncash
parent 456fb66617
commit 45af31fcb4
1 changed files with 15 additions and 0 deletions
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15
qemu/tcg/optimize.c
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@ -1110,6 +1110,21 @@ void tcg_optimize(TCGContext *s)
}
goto do_default;
case INDEX_op_dup2_vec:
assert(TCG_TARGET_REG_BITS == 32);
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
tmp = arg_info(op->args[1])->val;
if (tmp == arg_info(op->args[2])->val) {
tcg_opt_gen_movi(s, op, op->args[0], tmp);
break;
}
} else if (args_are_copies(op->args[1], op->args[2])) {
op->opc = INDEX_op_dup_vec;
TCGOP_VECE(op) = MO_32;
nb_iargs = 1;
}
goto do_default;
CASE_OP_32_64(not):
CASE_OP_32_64(neg):
CASE_OP_32_64(ext8s):