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tcg/optimize: Split out fold_count_zeros 

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-24 10:51:34 -07:00
parent 1b1907b846
commit 30dd0bfeb5
1 changed files with 18 additions and 14 deletions
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32
tcg/optimize.c
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@ -873,6 +873,20 @@ static bool fold_call(OptContext *ctx, TCGOp *op)
return true;
}
static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
if (t != 0) {
t = do_constant_folding(op->opc, t, 0);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]);
}
return false;
}
static bool fold_ctpop(OptContext *ctx, TCGOp *op)
{
return fold_const1(ctx, op);
@ -1739,20 +1753,6 @@ void tcg_optimize(TCGContext *s)
}
break;
CASE_OP_32_64(clz):
CASE_OP_32_64(ctz):
if (arg_is_const(op->args[1])) {
TCGArg v = arg_info(op->args[1])->val;
if (v != 0) {
tmp = do_constant_folding(opc, v, 0);
tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
} else {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[2]);
}
continue;
}
break;
default:
break;
@ -1777,6 +1777,10 @@ void tcg_optimize(TCGContext *s)
case INDEX_op_brcond2_i32:
done = fold_brcond2(&ctx, op);
break;
CASE_OP_32_64(clz):
CASE_OP_32_64(ctz):
done = fold_count_zeros(&ctx, op);
break;
CASE_OP_32_64(ctpop):
done = fold_ctpop(&ctx, op);
break;