[SPARC][IAS] Add IAS flag handling for ISA levels

Add IAS flag handling for ISA levels we support in LLVM.

Reviewers: MaskRay, rorth, brad0, s-barannikov

Reviewed By: MaskRay

Pull Request: llvm#125151

Author: koachan

clang/lib/Driver/ToolChains/Clang.cpp

@@ -2633,6 +2633,7 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
   bool UseNoExecStack = false;
   bool Msa = false;
   const char *MipsTargetFeature = nullptr;
+  llvm::SmallVector<const char *> SparcTargetFeatures;
   StringRef ImplicitIt;
   for (const Arg *A :
        Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler,
@@ -2778,6 +2779,31 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
         if (MipsTargetFeature)
           continue;
         break;
+
+      case llvm::Triple::sparc:
+      case llvm::Triple::sparcel:
+      case llvm::Triple::sparcv9:
+        if (Value == "--undeclared-regs") {
+          // LLVM already allows undeclared use of G registers, so this option
+          // becomes a no-op. This solely exists for GNU compatibility.
+          // TODO implement --no-undeclared-regs
+          continue;
+        }
+        SparcTargetFeatures =
+            llvm::StringSwitch<llvm::SmallVector<const char *>>(Value)
+                .Case("-Av8", {"-v8plus"})
+                .Case("-Av8plus", {"+v8plus", "+v9"})
+                .Case("-Av8plusa", {"+v8plus", "+v9", "+vis"})
+                .Case("-Av8plusb", {"+v8plus", "+v9", "+vis", "+vis2"})
+                .Case("-Av8plusd", {"+v8plus", "+v9", "+vis", "+vis2", "+vis3"})
+                .Case("-Av9", {"+v9"})
+                .Case("-Av9a", {"+v9", "+vis"})
+                .Case("-Av9b", {"+v9", "+vis", "+vis2"})
+                .Case("-Av9d", {"+v9", "+vis", "+vis2", "+vis3"})
+                .Default({});
+        if (!SparcTargetFeatures.empty())
+          continue;
+        break;
       }
 
       if (Value == "-force_cpusubtype_ALL") {
@@ -2882,6 +2908,10 @@ static void CollectArgsForIntegratedAssembler(Compilation &C,
     CmdArgs.push_back("-target-feature");
     CmdArgs.push_back(MipsTargetFeature);
   }
+  for (const char *Feature : SparcTargetFeatures) {
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back(Feature);
+  }
 
   // forward -fembed-bitcode to assmebler
   if (C.getDriver().embedBitcodeEnabled() ||

clang/test/Driver/sparc-ias-Wa.s

@@ -0,0 +1,60 @@
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av8 2>&1 | \
+// RUN:   FileCheck -check-prefix=V8 %s
+// V8: -cc1as
+// V8: "-target-feature" "-v8plus"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av8plus 2>&1 | \
+// RUN:   FileCheck -check-prefix=V8PLUS %s
+// V8PLUS: -cc1as
+// V8PLUS: "-target-feature" "+v8plus"
+// V8PLUS: "-target-feature" "+v9"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av8plusa 2>&1 | \
+// RUN:   FileCheck -check-prefix=V8PLUSA %s
+// V8PLUSA: -cc1as
+// V8PLUSA: "-target-feature" "+v8plus"
+// V8PLUSA: "-target-feature" "+v9"
+// V8PLUSA: "-target-feature" "+vis"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av8plusb 2>&1 | \
+// RUN:   FileCheck -check-prefix=V8PLUSB %s
+// V8PLUSB: -cc1as
+// V8PLUSB: "-target-feature" "+v8plus"
+// V8PLUSB: "-target-feature" "+v9"
+// V8PLUSB: "-target-feature" "+vis"
+// V8PLUSB: "-target-feature" "+vis2"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av8plusd 2>&1 | \
+// RUN:   FileCheck -check-prefix=V8PLUSD %s
+// V8PLUSD: -cc1as
+// V8PLUSD: "-target-feature" "+v8plus"
+// V8PLUSD: "-target-feature" "+v9"
+// V8PLUSD: "-target-feature" "+vis"
+// V8PLUSD: "-target-feature" "+vis2"
+// V8PLUSD: "-target-feature" "+vis3"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av9 2>&1 | \
+// RUN:   FileCheck -check-prefix=V9 %s
+// V9: -cc1as
+// V9: "-target-feature" "+v9"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av9a 2>&1 | \
+// RUN:   FileCheck -check-prefix=V9A %s
+// V9A: -cc1as
+// V9A: "-target-feature" "+v9"
+// V9A: "-target-feature" "+vis"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av9b 2>&1 | \
+// RUN:   FileCheck -check-prefix=V9B %s
+// V9B: -cc1as
+// V9B: "-target-feature" "+v9"
+// V9B: "-target-feature" "+vis"
+// V9B: "-target-feature" "+vis2"
+
+// RUN: %clang --target=sparc-linux-gnu -### -fintegrated-as -c %s -Wa,-Av9d 2>&1 | \
+// RUN:   FileCheck -check-prefix=V9D %s
+// V9D: -cc1as
+// V9D: "-target-feature" "+v9"
+// V9D: "-target-feature" "+vis"
+// V9D: "-target-feature" "+vis2"
+// V9D: "-target-feature" "+vis3"