[llvm-commits] [llvm] r95195 - in /llvm/trunk: lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp lib/Target/X86/X86ISelLowering.cpp test/CodeGen/X86/tailcall2.ll test/CodeGen/X86/tailcallfp2.ll

[Rafael Espindola]

>> short foo(void);
>> short bar(void) { return foo(); }
>>
>> Also, GCC declines the tailcall optimization for this code.
>
> I know. The question is whether that's just a missed optimization?

It is. With gcc 4.2 I get

	call	foo
	addq	$8, %rsp
	cwtl
	ret

But with 4.4 I get

        jmp     foo

There is a similar issues with function arguments:

http://gcc.gnu.org/ml/gcc/2009-03/msg00426.html

Unfortunately I never got a reply on that.

> Evan

Cheers.
-- 
Rafael Ávila de Espíndola