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tcg: Add add/sub with carry opcodes and infrastructure

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Liveness needs to track carry-live state in order to
determine if the (hidden) output of the opcode is used.
Code generation needs to track carry-live state in order
to avoid clobbering cpu flags when loading constants.

So far, output routines and backends are unchanged.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2025-01-14 13:58:39 -08:00
parent 3e3689df4e
commit 76f4278029
5 changed files with 235 additions and 10 deletions
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11
tcg/optimize.c
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@ -1226,6 +1226,12 @@ static bool fold_add_vec(OptContext *ctx, TCGOp *op)
return finish_folding(ctx, op);
}
static bool fold_add_carry(OptContext *ctx, TCGOp *op)
{
fold_commutative(ctx, op);
return finish_folding(ctx, op);
}
static bool fold_addsub2(OptContext *ctx, TCGOp *op, bool add)
{
bool a_const = arg_is_const(op->args[2]) && arg_is_const(op->args[3]);
@ -2829,6 +2835,11 @@ void tcg_optimize(TCGContext *s)
case INDEX_op_add_vec:
done = fold_add_vec(&ctx, op);
break;
case INDEX_op_addci:
case INDEX_op_addco:
case INDEX_op_addcio:
done = fold_add_carry(&ctx, op);
break;
CASE_OP_32_64(add2):
done = fold_add2(&ctx, op);
break;