Handle -mno-<feature> in target attribute strings by replacing the

-mno- with a -<feature> to match how we handle this in the rest
of the frontend.

llvm-svn: 239581

clang/lib/CodeGen/CGCall.cpp

@@ -1515,8 +1515,10 @@ void CodeGenModule::ConstructAttributeList(const CGFunctionInfo &FI,
 	  else if (Feature.startswith("tune="))
 	    // We don't support cpu tuning this way currently.
 	    ;
-	  else
-	    Features.push_back("+" + Feature.str());
+	  else if (Feature.startswith("mno-"))
+            Features.push_back("-" + Feature.split("-").second.str());
+          else
+            Features.push_back("+" + Feature.str());
 	}
       }
     }

clang/test/CodeGen/attr-target.c

@@ -6,6 +6,8 @@ int __attribute__((target("avx,sse4.2,arch=ivybridge"))) foo(int a) { return 4;
 
 int __attribute__((target("tune=sandybridge"))) walrus(int a) { return 4; }
 
+int __attribute__((target("mno-sse2"))) echidna(int a) { return 4; }
+
 int bar(int a) { return baz(a) + foo(a); }
 
 // Check that we emit the additional subtarget and cpu features for foo and not for baz or bar.
@@ -13,6 +15,8 @@ int bar(int a) { return baz(a) + foo(a); }
 // CHECK: foo{{.*}} #1
 // We ignore the tune attribute so walrus should be identical to baz and bar.
 // CHECK: walrus{{.*}} #0
+// CHECK: echidna{{.*}} #2
 // CHECK: bar{{.*}} #0
 // CHECK: #0 = {{.*}}"target-cpu"="x86-64" "target-features"="+sse,+sse2"
 // CHECK: #1 = {{.*}}"target-cpu"="ivybridge" "target-features"="+sse,+sse2,+avx,+sse4.2"
+// CHECK: #2 = {{.*}}"target-cpu"="x86-64" "target-features"="+sse,+sse2,-sse2"