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tcg/optimize: Expand fold_mulu2_i32 to all 4-arg multiplies

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Rename to fold_multiply2, and handle muls2_i32, mulu2_i64,
and muls2_i64.

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 2021-08-26 06:33:04 -07:00
parent fae450ba47
commit 407112b03d
1 changed files with 35 additions and 9 deletions
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44
tcg/optimize.c
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@ -1412,19 +1412,44 @@ static bool fold_mul_highpart(OptContext *ctx, TCGOp *op)
return false; return false;
} }
static bool fold_mulu2_i32(OptContext *ctx, TCGOp *op) static bool fold_multiply2(OptContext *ctx, TCGOp *op)
{ {
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) { if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
uint32_t a = arg_info(op->args[2])->val; uint64_t a = arg_info(op->args[2])->val;
uint32_t b = arg_info(op->args[3])->val; uint64_t b = arg_info(op->args[3])->val;
uint64_t r = (uint64_t)a * b; uint64_t h, l;
TCGArg rl, rh; TCGArg rl, rh;
TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_mov_i32); TCGOp *op2;
switch (op->opc) {
case INDEX_op_mulu2_i32:
l = (uint64_t)(uint32_t)a * (uint32_t)b;
h = (int32_t)(l >> 32);
l = (int32_t)l;
break;
case INDEX_op_muls2_i32:
l = (int64_t)(int32_t)a * (int32_t)b;
h = l >> 32;
l = (int32_t)l;
break;
case INDEX_op_mulu2_i64:
mulu64(&l, &h, a, b);
break;
case INDEX_op_muls2_i64:
muls64(&l, &h, a, b);
break;
default:
g_assert_not_reached();
}
rl = op->args[0]; rl = op->args[0];
rh = op->args[1]; rh = op->args[1];
tcg_opt_gen_movi(ctx, op, rl, (int32_t)r);
tcg_opt_gen_movi(ctx, op2, rh, (int32_t)(r >> 32)); /* The proper opcode is supplied by tcg_opt_gen_mov. */
op2 = tcg_op_insert_before(ctx->tcg, op, 0);
tcg_opt_gen_movi(ctx, op, rl, l);
tcg_opt_gen_movi(ctx, op2, rh, h);
return true; return true;
} }
return false; return false;
@ -1932,8 +1957,9 @@ void tcg_optimize(TCGContext *s)
CASE_OP_32_64(muluh): CASE_OP_32_64(muluh):
done = fold_mul_highpart(&ctx, op); done = fold_mul_highpart(&ctx, op);
break; break;
case INDEX_op_mulu2_i32: CASE_OP_32_64(muls2):
done = fold_mulu2_i32(&ctx, op); CASE_OP_32_64(mulu2):
done = fold_multiply2(&ctx, op);
break; break;
CASE_OP_32_64(nand): CASE_OP_32_64(nand):
done = fold_nand(&ctx, op); done = fold_nand(&ctx, op);