[WebAssembly] Add target flags for sign-ext opcodes.

Add -msign-ext and -mno-sign-ext to control the new sign-ext target
feature.

llvm-svn: 322967

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets/WebAssembly.cpp b/clang/lib/Basic/Targets/WebAssembly.cpp
index 915aad4b563..ecccb588659 100644
--- a/clang/lib/Basic/Targets/WebAssembly.cpp
+++ b/clang/lib/Basic/Targets/WebAssembly.cpp
@@ -33,6 +33,7 @@ bool WebAssemblyTargetInfo::hasFeature(StringRef Feature) const {
   return llvm::StringSwitch<bool>(Feature)
       .Case("simd128", SIMDLevel >= SIMD128)
       .Case("nontrapping-fptoint", HasNontrappingFPToInt)
+      .Case("sign-ext", HasSignExt)
       .Default(false);
 }
 
@@ -70,6 +71,14 @@ bool WebAssemblyTargetInfo::handleTargetFeatures(
       HasNontrappingFPToInt = false;
       continue;
     }
+    if (Feature == "+sign-ext") {
+      HasSignExt = true;
+      continue;
+    }
+    if (Feature == "-sign-ext") {
+      HasSignExt = false;
+      continue;
+    }
 
     Diags.Report(diag::err_opt_not_valid_with_opt)
         << Feature << "-target-feature";