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A32/ASIMD: Ensure decoder table is correct

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* Raise a DecoderError instead of ASSERT-ing on a decode error
* Correct ASIMD decode table
* Write a test which verifies every possible ASIMD instruction
This commit is contained in:
MerryMage
2020-07-05 18:21:12 +01:00
parent 3c742960a9
commit 82868034d3
12 changed files with 183 additions and 62 deletions
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23
src/frontend/A32/decoder/asimd.h
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@@ -31,14 +31,13 @@ std::vector<ASIMDMatcher<V>> GetASIMDDecodeTable() {
};
// If a matcher has more bits in its mask it is more specific, so it should come first.
std::stable_sort(table.begin(), table.end(), [](const auto& matcher1, const auto& matcher2) {
return Common::BitCount(matcher1.GetMask()) > Common::BitCount(matcher2.GetMask());
});
// Exceptions to the above rule of thumb.
// Exceptions to the rule of thumb.
const std::set<std::string> comes_first{
"VBIC, VMOV, VMVN, VORR (immediate)"
"VBIC, VMOV, VMVN, VORR (immediate)",
"VEXT",
"VTBL",
"VTBX",
"VDUP (scalar)",
};
const std::set<std::string> comes_last{
"VMLA (scalar)",
@@ -50,14 +49,18 @@ std::vector<ASIMDMatcher<V>> GetASIMDDecodeTable() {
"VQDMULH (scalar)",
"VQRDMULH (scalar)",
};
std::stable_partition(table.begin(), table.end(), [&](const auto& matcher) {
const auto sort_begin = std::stable_partition(table.begin(), table.end(), [&](const auto& matcher) {
return comes_first.count(matcher.GetName()) > 0;
});
std::stable_partition(table.begin(), table.end(), [&](const auto& matcher) {
const auto sort_end = std::stable_partition(table.begin(), table.end(), [&](const auto& matcher) {
return comes_last.count(matcher.GetName()) == 0;
});
// If a matcher has more bits in its mask it is more specific, so it should come first.
std::stable_sort(sort_begin, sort_end, [](const auto& matcher1, const auto& matcher2) {
return Common::BitCount(matcher1.GetMask()) > Common::BitCount(matcher2.GetMask());
});
return table;
}