diff --git a/gen/complex.cpp b/gen/complex.cpp
index a02e3598..a0c66c34 100644
--- a/gen/complex.cpp
+++ b/gen/complex.cpp
@@ -282,6 +282,24 @@ DValue* DtoComplexDiv(Type* type, DValue* lhs, DValue* rhs)
 
 //////////////////////////////////////////////////////////////////////////////////////////
 
+DValue* DtoComplexNeg(Type* type, DValue* val)
+{
+    val = DtoComplex(type, val);
+
+    llvm::Value *a, *b, *re, *im;
+
+    // values
+    DtoGetComplexParts(val, a, b);
+
+    // sub up
+    re = gIR->ir->CreateNeg(a, "tmp");
+    im = gIR->ir->CreateNeg(b, "tmp");
+
+    return new DComplexValue(type, re, im);
+}
+
+//////////////////////////////////////////////////////////////////////////////////////////
+
 llvm::Value* DtoComplexEquals(TOK op, DValue* lhs, DValue* rhs)
 {
     Type* type = lhs->getType();
diff --git a/gen/complex.h b/gen/complex.h
index 3ba79014..595fff71 100644
--- a/gen/complex.h
+++ b/gen/complex.h
@@ -23,6 +23,7 @@ DValue* DtoComplexAdd(Type* type, DValue* lhs, DValue* rhs);
 DValue* DtoComplexSub(Type* type, DValue* lhs, DValue* rhs);
 DValue* DtoComplexMul(Type* type, DValue* lhs, DValue* rhs);
 DValue* DtoComplexDiv(Type* type, DValue* lhs, DValue* rhs);
+DValue* DtoComplexNeg(Type* type, DValue* val);
 
 llvm::Value* DtoComplexEquals(TOK op, DValue* lhs, DValue* rhs);
 
diff --git a/gen/toir.cpp b/gen/toir.cpp
index 8a28c48b..017d98db 100644
--- a/gen/toir.cpp
+++ b/gen/toir.cpp
@@ -2394,8 +2394,12 @@ DValue* NegExp::toElem(IRState* p)
     LOG_SCOPE;
 
     DValue* l = e1->toElem(p);
-    llvm::Value* val = l->getRVal();
 
+    if (type->iscomplex()) {
+        return DtoComplexNeg(type, l);
+    }
+
+    llvm::Value* val = l->getRVal();
     Type* t = DtoDType(type);
 
     llvm::Value* zero = 0;
@@ -2407,7 +2411,10 @@ DValue* NegExp::toElem(IRState* p)
         else if (t->ty == Tfloat64 || t->ty == Tfloat80 || t->ty == Timaginary64 || t->ty == Timaginary80)
             zero = llvm::ConstantFP::get(val->getType(), llvm::APFloat(0.0));
         else
-        assert(0);
+        {
+            Logger::println("unhandled fp negation of type %s", t->toChars());
+            assert(0);
+        }
     }
     else
         assert(0);
diff --git a/tango/tango/math/Math.d b/tango/tango/math/Math.d
index ffa1119c..f99bdb15 100644
--- a/tango/tango/math/Math.d
+++ b/tango/tango/math/Math.d
@@ -369,6 +369,8 @@ real tan(real x)
 {
     version (GNU) {
         return tanl(x);
+    } else version (LLVMDC) {
+        return tango.stdc.math.tanl(x);
     } else {
     asm
     {
diff --git a/tangotests/stdout2.d b/tangotests/stdout2.d
index 12658f55..8c32e578 100644
--- a/tangotests/stdout2.d
+++ b/tangotests/stdout2.d
@@ -4,5 +4,5 @@ import tango.io.Stdout;
 
 void main()
 {
-    Stdout.formatln("{} {} {}", "a", "b", 1);
+    Stdout.formatln("{} {} {}", "a", "b", 1.0);
 }