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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
comparison
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1046:cc6489f32519 1047:6bb04dbee21f
94 // do abi specific transformations on the return value 94 // do abi specific transformations on the return value
95 LLValue* v = p->func()->type->fty->putRet(exp->type, exp->toElem(p)); 95 LLValue* v = p->func()->type->fty->putRet(exp->type, exp->toElem(p));
96 96
97 if (Logger::enabled()) 97 if (Logger::enabled())
98 Logger::cout() << "return value is '" <<*v << "'\n"; 98 Logger::cout() << "return value is '" <<*v << "'\n";
99
100 IrFunction* f = p->func();
101 // Hack around LDC assuming structs are in memory:
102 // If the function returns a struct, and the return value is a
103 // pointer to a struct, load from it before returning.
104 if (f->type->next->ty == Tstruct && isaPointer(v->getType())) {
105 Logger::println("Loading struct type for return");
106 v = DtoLoad(v);
107 }
99 108
100 // can happen for classes and void main 109 // can happen for classes and void main
101 if (v->getType() != p->topfunc()->getReturnType()) 110 if (v->getType() != p->topfunc()->getReturnType())
102 { 111 {
103 // for the main function this only happens if it is declared as void 112 // for the main function this only happens if it is declared as void