[clang] [RISCV] Implement multi-lib reuse rule for RISC-V bare-metal toolchain (PR #73765)
Craig Topper via cfe-commits
cfe-commits at lists.llvm.org
Wed Nov 29 10:04:38 PST 2023
================
@@ -1715,6 +1716,129 @@ static void findCSKYMultilibs(const Driver &D, const llvm::Triple &TargetTriple,
Result.Multilibs = CSKYMultilibs;
}
+/// Extend the multi-lib re-use selection mechanism for RISC-V.
+/// This funciton will try to re-use multi-lib if they are compatible.
+/// Definition of compatible:
+/// - ABI must be the same.
+/// - multi-lib is a subset of current arch, e.g. multi-lib=march=rv32im
+/// is a subset of march=rv32imc.
+/// - march that contains atomic extension can't reuse multi-lib that
+/// doesn't has atomic, vice versa. e.g. multi-lib=march=rv32im and
+/// march=rv32ima are not compatible, because software and hardware
+/// atomic operation can't work together correctly.
+static bool
+RISCVMultilibSelect(const MultilibSet &RISCVMultilibSet, StringRef Arch,
+ const Multilib::flags_list &Flags,
+ llvm::SmallVector<Multilib> &SelectedMultilibs) {
+ // Try to find the perfect matching multi-lib first.
+ if (RISCVMultilibSet.select(Flags, SelectedMultilibs))
+ return true;
+
+ llvm::StringMap<bool> FlagSet;
+ Multilib::flags_list NewFlags;
+ std::vector<MultilibBuilder> NewMultilibs;
+
+ auto ParseResult = llvm::RISCVISAInfo::parseArchString(
+ Arch, /*EnableExperimentalExtension=*/true,
+ /*ExperimentalExtensionVersionCheck=*/false);
+ if (!ParseResult) {
+ // Ignore any error here, we assume it will handled in another place.
----------------
topperc wrote:
"will handled" -> "will be handled"
https://github.com/llvm/llvm-project/pull/73765
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