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diff gen/statements.cpp @ 1047:6bb04dbee21f

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Some calling convention work for x86-64: - Implement x86-64 extern(C), hopefully correctly. - Tried to be a bit smarter about extern(D) while I was there. Interestingly, this code seems to be generating more efficient code than gcc and llvm-gcc in some edge cases, like returning a `{ [7 x i8] }` loaded from a stack slot from an extern(C) function. (gcc generates 7 1-byte loads, while this code generates a 4-byte, a 2-byte and a 1-byte load) I also added some changes to make sure structs being returned from functions or passed in as parameters are stored in memory where the rest of the backend seems to expect them to be. These should be removed when support for first-class aggregates improves.
author Frits van Bommel <fvbommel wxs.nl>
date Fri, 06 Mar 2009 16:00:47 +0100
parents 45af482e3832
children dc608dc33081
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line diff
--- a/gen/statements.cpp	Thu Mar 05 21:32:18 2009 +0100
+++ b/gen/statements.cpp	Fri Mar 06 16:00:47 2009 +0100
@@ -97,6 +97,15 @@
             if (Logger::enabled())
                 Logger::cout() << "return value is '" <<*v << "'\n";
 
+            IrFunction* f = p->func();
+            // Hack around LDC assuming structs are in memory:
+            // If the function returns a struct, and the return value is a
+            // pointer to a struct, load from it before returning.
+            if (f->type->next->ty == Tstruct && isaPointer(v->getType())) {
+                Logger::println("Loading struct type for return");
+                v = DtoLoad(v);
+            }
+
             // can happen for classes and void main
             if (v->getType() != p->topfunc()->getReturnType())
             {