[Flang][Driver] Handle target CPU and features
This patch:
- Adds target-feature and target-cpu to FC1Options.
- Moves getTargetFeatures() from Clang.cpp to CommonArgs.cpp.
- Processes target cpu and features in the flang driver. Right now
features are only added for AArch64/x86 because I only did basic
testing on them but it should generally work for others as well.
Option handling is similar to clang.
- Adds appropriate structures in TargetOptions and passes them to
the target machine.
What's missing:
- Adding the CPU info and the features as attributes in the LLVM IR
module.
- Processing target specific flags, e.g. SVE vector bits for AArch64,
ABI etc.
Differential Revision: https://reviews.llvm.org/D137995
Change-Id: Ib081a74ea98617674845518a5d2754edba596418
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index 588fabd..b2b08f9 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -80,6 +80,32 @@
}
}
+void Flang::addTargetOptions(const ArgList &Args,
+ ArgStringList &CmdArgs) const {
+ const ToolChain &TC = getToolChain();
+ const llvm::Triple &Triple = TC.getEffectiveTriple();
+ const Driver &D = TC.getDriver();
+
+ std::string CPU = getCPUName(D, Args, Triple);
+ if (!CPU.empty()) {
+ CmdArgs.push_back("-target-cpu");
+ CmdArgs.push_back(Args.MakeArgString(CPU));
+ }
+
+ // Add the target features.
+ switch (TC.getArch()) {
+ default:
+ break;
+ case llvm::Triple::aarch64:
+ [[fallthrough]];
+ case llvm::Triple::x86_64:
+ getTargetFeatures(D, Triple, Args, CmdArgs, /*ForAs*/ false);
+ break;
+ }
+
+ // TODO: Add target specific flags, ABI, mtune option etc.
+}
+
static void addFloatingPointOptions(const Driver &D, const ArgList &Args,
ArgStringList &CmdArgs) {
StringRef FPContract;
@@ -243,6 +269,9 @@
// Floating point related options
addFloatingPointOptions(D, Args, CmdArgs);
+ // Add target args, features, etc.
+ addTargetOptions(Args, CmdArgs);
+
// Add other compile options
addOtherOptions(Args, CmdArgs);
