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shader: Fix error checking in bitfieldExtract and implement bitfieldInsert folding

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This commit is contained in:
ReinUsesLisp 2021-04-23 08:17:53 -03:00 committed by ameerj
parent 0c0ee9d897
commit 50eb03382e
1 changed files with 14 additions and 5 deletions
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19
src/shader_recompiler/ir_opt/constant_propagation_pass.cpp
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@ -553,7 +553,7 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
return;
case IR::Opcode::BitFieldUExtract:
FoldWhenAllImmediates(inst, [](u32 base, u32 shift, u32 count) {
if (static_cast<size_t>(shift) + static_cast<size_t>(count) > Common::BitSize<u32>()) {
if (static_cast<size_t>(shift) + static_cast<size_t>(count) > 32) {
throw LogicError("Undefined result in {}({}, {}, {})", IR::Opcode::BitFieldUExtract,
base, shift, count);
}
@ -563,13 +563,22 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
case IR::Opcode::BitFieldSExtract:
FoldWhenAllImmediates(inst, [](s32 base, u32 shift, u32 count) {
const size_t back_shift{static_cast<size_t>(shift) + static_cast<size_t>(count)};
if (back_shift > Common::BitSize<s32>()) {
const size_t left_shift{32 - back_shift};
const size_t right_shift{static_cast<size_t>(32 - count)};
if (back_shift >= 32 || left_shift >= 32 || right_shift >= 32) {
throw LogicError("Undefined result in {}({}, {}, {})", IR::Opcode::BitFieldSExtract,
base, shift, count);
}
const size_t left_shift{Common::BitSize<s32>() - back_shift};
return static_cast<u32>(static_cast<s32>(base << left_shift) >>
static_cast<size_t>(Common::BitSize<s32>() - count));
return static_cast<u32>((base << left_shift) >> right_shift);
});
return;
case IR::Opcode::BitFieldInsert:
FoldWhenAllImmediates(inst, [](u32 base, u32 insert, u32 offset, u32 bits) {
if (bits >= 32 || offset >= 32) {
throw LogicError("Undefined result in {}({}, {}, {}, {})",
IR::Opcode::BitFieldInsert, base, insert, offset, bits);
}
return (base & ~(~(~0u << bits) << offset)) | (insert << offset);
});
return;
case IR::Opcode::BranchConditional: