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tcg/optimize: Split out fold_movcond

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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 10:37:24 -07:00
parent e3f7dc2167
commit 0c310a3005
1 changed files with 31 additions and 25 deletions
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56
tcg/optimize.c
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@ -922,6 +922,34 @@ static bool fold_mb(OptContext *ctx, TCGOp *op)
return true;
}
static bool fold_movcond(OptContext *ctx, TCGOp *op)
{
TCGOpcode opc = op->opc;
TCGCond cond = op->args[5];
int i = do_constant_folding_cond(opc, op->args[1], op->args[2], cond);
if (i >= 0) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[4 - i]);
}
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
uint64_t tv = arg_info(op->args[3])->val;
uint64_t fv = arg_info(op->args[4])->val;
opc = (opc == INDEX_op_movcond_i32
? INDEX_op_setcond_i32 : INDEX_op_setcond_i64);
if (tv == 1 && fv == 0) {
op->opc = opc;
op->args[3] = cond;
} else if (fv == 1 && tv == 0) {
op->opc = opc;
op->args[3] = tcg_invert_cond(cond);
}
}
return false;
}
static bool fold_mul(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
@ -1715,31 +1743,6 @@ void tcg_optimize(TCGContext *s)
}
break;
CASE_OP_32_64(movcond):
i = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[5]);
if (i >= 0) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[4 - i]);
continue;
}
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
uint64_t tv = arg_info(op->args[3])->val;
uint64_t fv = arg_info(op->args[4])->val;
TCGCond cond = op->args[5];
if (fv == 1 && tv == 0) {
cond = tcg_invert_cond(cond);
} else if (!(tv == 1 && fv == 0)) {
break;
}
op->args[3] = cond;
op->opc = opc = (opc == INDEX_op_movcond_i32
? INDEX_op_setcond_i32
: INDEX_op_setcond_i64);
}
break;
default:
break;
@ -1791,6 +1794,9 @@ void tcg_optimize(TCGContext *s)
case INDEX_op_mb:
done = fold_mb(&ctx, op);
break;
CASE_OP_32_64(movcond):
done = fold_movcond(&ctx, op);
break;
CASE_OP_32_64(mul):
done = fold_mul(&ctx, op);
break;