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glasm: Catch more register leaks

Browse source 
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 a5ce5f4a65
commit 143db4b112
8 changed files with 114 additions and 41 deletions
Download patch file Download diff file Expand all files Collapse all files

28
src/shader_recompiler/backend/glasm/reg_alloc.cpp
View file

@ -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");
}