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glasm: Catch more register leaks

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Add support for null registers. These are used when an instruction has
no usages.

This comes handy when an instruction is only used for its CC value, with
the caveat of having to invalidate all pseudo-instructions before
defining the instruction itself in the register allocator. This commits
changes this.

Workaround a bug on Nvidia's condition codes conditional execution using
branches.
This commit is contained in:
ReinUsesLisp
2021-05-25 02:22:21 -03:00
committed by ameerj
parent 9fbfe7d676
commit ca05a13c62
8 changed files with 114 additions and 41 deletions
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28
src/shader_recompiler/backend/glasm/reg_alloc.cpp
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@ -22,11 +22,19 @@ Register RegAlloc::LongDefine(IR::Inst& inst) {
}
Value RegAlloc::Peek(const IR::Value& value) {
return value.IsImmediate() ? MakeImm(value) : PeekInst(*value.InstRecursive());
if (value.IsImmediate()) {
return MakeImm(value);
} else {
return PeekInst(*value.Inst());
}
}
Value RegAlloc::Consume(const IR::Value& value) {
return value.IsImmediate() ? MakeImm(value) : ConsumeInst(*value.InstRecursive());
if (value.IsImmediate()) {
return MakeImm(value);
} else {
return ConsumeInst(*value.Inst());
}
}
void RegAlloc::Unref(IR::Inst& inst) {
@ -88,7 +96,14 @@ Value RegAlloc::MakeImm(const IR::Value& value) {
}
Register RegAlloc::Define(IR::Inst& inst, bool is_long) {
inst.SetDefinition<Id>(Alloc(is_long));
if (inst.HasUses()) {
inst.SetDefinition<Id>(Alloc(is_long));
} else {
Id id{};
id.is_long.Assign(is_long ? 1 : 0);
id.is_null.Assign(1);
inst.SetDefinition<Id>(id);
}
return Register{PeekInst(inst)};
}
@ -115,10 +130,12 @@ Id RegAlloc::Alloc(bool is_long) {
num_regs = std::max(num_regs, reg + 1);
use[reg] = true;
Id ret{};
ret.index.Assign(static_cast<u32>(reg));
ret.is_valid.Assign(1);
ret.is_long.Assign(is_long ? 1 : 0);
ret.is_spill.Assign(0);
ret.is_condition_code.Assign(0);
ret.is_null.Assign(0);
ret.index.Assign(static_cast<u32>(reg));
return ret;
}
}
@ -126,6 +143,9 @@ Id RegAlloc::Alloc(bool is_long) {
}
void RegAlloc::Free(Id id) {
if (id.is_valid == 0) {
throw LogicError("Freeing invalid register");
}
if (id.is_spill != 0) {
throw NotImplementedException("Free spill");
}