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[RISCV] Add a table for extension implications. 

This a proof of concept for a suggestion I proposed in D108694.

Reviewed By: eopXD

Differential Revision: https://reviews.llvm.org/D115668
This commit is contained in:
Craig Topper 2021-12-14 09:17:50 -08:00
parent 0005efd455
commit df44aaa50e
1 changed files with 28 additions and 10 deletions
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38
llvm/lib/Support/RISCVISAInfo.cpp
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@ -695,11 +695,28 @@ Error RISCVISAInfo::checkDependency() {
return Error::success();
}
static const char *ImpliedExtsV[] = {"zvlsseg"};
static const char *ImpliedExtsZfh[] = {"zfhmin"};
struct ImpliedExtsEntry {
StringLiteral Name;
ArrayRef<const char *> Exts;
bool operator<(const ImpliedExtsEntry &Other) const {
return Name < Other.Name;
}
bool operator<(StringRef Other) const { return Name < Other; }
};
static constexpr ImpliedExtsEntry ImpliedExts[] = {
{"v", ImpliedExtsV},
{"zfh", ImpliedExtsZfh},
};
void RISCVISAInfo::updateImplication() {
bool HasE = Exts.count("e") == 1;
bool HasI = Exts.count("i") == 1;
bool HasV = Exts.count("v") == 1;
bool HasZfh = Exts.count("zfh") == 1;
// If not in e extension and i extension does not exist, i extension is
// implied
@ -708,14 +725,15 @@ void RISCVISAInfo::updateImplication() {
addExtension("i", Version->Major, Version->Minor);
}
if (HasV) {
auto Version = findDefaultVersion("zvlsseg");
addExtension("zvlsseg", Version->Major, Version->Minor);
}
if (HasZfh) {
auto Version = findDefaultVersion("zfhmin");
addExtension("zfhmin", Version->Major, Version->Minor);
assert(llvm::is_sorted(ImpliedExts) && "Table not sorted by Name");
for (auto &Ext : Exts) {
auto I = llvm::lower_bound(ImpliedExts, Ext.first);
if (I != std::end(ImpliedExts) && I->Name == Ext.first) {
for (auto &ImpliedExt : I->Exts) {
auto Version = findDefaultVersion(ImpliedExt);
addExtension(ImpliedExt, Version->Major, Version->Minor);
}
}
}
}