[LoongArch] add la v1.1 features for sys::getHostCPUFeatures

[tangaac]

Two features (i.e. frecipe and lam-bh) are added to sys.getHostCPUFeatures. More features will be added in future.

In addition, this patch adds the features returned by sys.getHostCPUFeature when -march=native.

[llvmbot]

@llvm/pr-subscribers-backend-loongarch
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: None (tangaac)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/115832.diff

2 Files Affected:

• (modified) clang/lib/Driver/ToolChains/Arch/LoongArch.cpp (+6-1)
• (modified) llvm/lib/TargetParser/Host.cpp (+9)

diff --git a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
index e69a5562137ccd..2dc7550176f5f0 100644
--- a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
@@ -135,8 +135,13 @@ void loongarch::getLoongArchTargetFeatures(const Driver &D,
     Features.push_back("+lsx");
 
   std::string ArchName;
-  if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
+  if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
     ArchName = A->getValue();
+    if (ArchName == "native")
+      for (auto &F : llvm::sys::getHostCPUFeatures())
+        Features.push_back(
+            Args.MakeArgString((F.second ? "+" : "-") + F.first()));
+  }
   ArchName = postProcessTargetCPUString(ArchName, Triple);
   llvm::LoongArch::getArchFeatures(ArchName, Features);
 
diff --git a/llvm/lib/TargetParser/Host.cpp b/llvm/lib/TargetParser/Host.cpp
index 58ba2553633221..d0f3bbc26716e7 100644
--- a/llvm/lib/TargetParser/Host.cpp
+++ b/llvm/lib/TargetParser/Host.cpp
@@ -2006,6 +2006,15 @@ const StringMap<bool> sys::getHostCPUFeatures() {
   Features["lasx"] = hwcap & (1UL << 5); // HWCAP_LOONGARCH_LASX
   Features["lvz"] = hwcap & (1UL << 9);  // HWCAP_LOONGARCH_LVZ
 
+  Features["frecipe"] = cpucfg2 & (1U << 25);     // CPUCFG.2.FRECIPE
+  Features["lam-bh"] = cpucfg2 & (1U << 27);      // CPUCFG.2.LAM_BH
+
+  // TODO: Need to complete.
+  // Features["div32"] = cpucfg2 & (1U << 26);       // CPUCFG.2.DIV32
+  // Features["lamcas"] = cpucfg2 & (1U << 28);      // CPUCFG.2.LAMCAS
+  // Features["llacq-screl"] = cpucfg2 & (1U << 29); // CPUCFG.2.LLACQ_SCREL
+  // Features["scq"] = cpucfg2 & (1U << 30);         // CPUCFG.2.SCQ
+  // Features["ld-seq-sa"] = cpucfg3 & (1U << 23); // CPUCFG.3.LD_SEQ_SA
   return Features;
 }
 #elif defined(__linux__) && defined(__riscv)

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[SixWeining]

Could you add theual feature in another PR? Thanks.

[SixWeining]

LGTM. Tips: It's not necessary to use force-push to address review comments. Add new commits and they will be squashed when merge.