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glasm: Review all GLASM insts to be aware of register aliasing

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ReinUsesLisp 2021-05-10 19:20:15 -03:00 • committed by ameerj
parent c4fd6b55bc
commit 70fbede213
4 changed files with 51 additions and 20 deletions
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19
src/shader_recompiler/backend/glasm/emit_glasm_composite.cpp
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@ -41,10 +41,23 @@ template <typename ObjectType>
void CompositeInsert(EmitContext& ctx, IR::Inst& inst, Register composite, ObjectType object,
u32 index, char type) {
const Register ret{ctx.reg_alloc.Define(inst)};
if (ret != composite) {
ctx.Add("MOV.{} {},{};", type, ret, composite);
const char swizzle{"xyzw"[index]};
if (ret != composite && ret == object) {
// The object is aliased with the return value, so we have to use a temporary to insert
ctx.Add("MOV.{} RC,{};"
"MOV.{} RC.{},{};"
"MOV.{} {},RC;",
type, composite, type, swizzle, object, type, ret);
} else if (ret != composite) {
// The input composite is not aliased with the return value so we have to copy it before
// hand. But the insert object is not aliased with the return value, so we don't have to
// worry about that
ctx.Add("MOV.{} {},{};MOV.{},{}.{},{};", type, ret, composite, type, ret, swizzle, object);
} else {
// The return value is alised so we can just insert the object, it doesn't matter if it's
// aliased
ctx.Add("MOV.{} {}.{},{};", type, ret, swizzle, object);
}
ctx.Add("MOV.{} {}.{},{};", type, ret, "xyzw"[index], object);
}
} // Anonymous namespace