Split complex arithmetic codegen out from aggregate codegen.

This means that we get rid of tons of intermediate allocas.  For
example:

void foo(double _Complex a, double _Complex b) {
   a = b+a+a;
}

this used to have 4 temporary allocas, now it has zero of them.
This also simplifies the individual visitor methods because they
now can all operate on real/imag pairs instead of having to 
load/store all over the place.

llvm-svn: 41217

1 files changed, 3 insertions, 1 deletions

diff --git a/clang/CodeGen/CGStmt.cpp b/clang/CodeGen/CGStmt.cpp
index 131e2b553c3..c128abcca9c 100644
--- a/clang/CodeGen/CGStmt.cpp
+++ b/clang/CodeGen/CGStmt.cpp
@@ -31,7 +31,9 @@ void CodeGenFunction::EmitStmt(const Stmt *S) {
     // Must be an expression in a stmt context.  Emit the value and ignore the
     // result.
     if (const Expr *E = dyn_cast<Expr>(S)) {
-      if (hasAggregateLLVMType(E->getType()))
+      if (E->getType()->isComplexType()) {
+        EmitComplexExpr(E);
+      } else if (hasAggregateLLVMType(E->getType()))
         EmitAggExpr(E, 0, false);  // Emit an aggregate, ignoring the result.
       else
         EmitExpr(E);