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[qfcc] Use staging vars for non-const params

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Non-const params use references and so need somewhere to store the
arguments. Local variables could be passed directly (parameters normally
require function storage class, which local variables are), but that's a
potential optimization for later.
This commit is contained in:
Bill Currie 2024-11-14 00:45:53 +09:00
parent 698430630d
commit 5033dc9a12
1 changed files with 19 additions and 1 deletions
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18
tools/qfcc/source/target_spirv.c
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@ -911,7 +911,25 @@ spirv_call (const expr_t *call, spirvctx_t *ctx)
list_scatter_rev (&call->branch.args->list, args);
for (int i = 0; i < num_args; i++) {
auto a = args[i];
if (func_type->func.param_quals[i] == pq_const) {
arg_ids[i] = spirv_emit_expr (a, ctx);
} else {
auto psym = new_symbol ("param");
psym->type = reference_type (get_type (a));
psym->sy_type = sy_var;
psym->var.storage = SpvStorageClassFunction;
psym->id = spirv_variable (psym, ctx);
psym->lvalue = true;
arg_ids[i] = psym->id;
if (func_type->func.param_quals[i] != pq_out) {
if (a->type == ex_inout) {
a = a->inout.in;
}
auto pexpr = new_symbol_expr (psym);
auto assign = assign_expr (pexpr, a);
spirv_emit_expr (assign, ctx);
}
}
}
unsigned id = spirv_id (ctx);