[Bug c++/13005] Pointer wrongly adjusted for derived class containing virtual function

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2003-11-11 17:57 -------
Oh, yes, and one more datapoint: without optimization, I get this assembler code:
	pushl	%ebp
	movl	%esp, %ebp
	movl	8(%ebp), %eax
	movl	(%eax), %edx
	addl	$4, %edx
	movl	12(%ebp), %eax
	movl	%eax, 4(%edx)
	popl	%ebp
	ret
That is, the addl is there. On the other hand, _with_ optimization, we get
	pushl	%ebp
	movl	%esp, %ebp
	movl	8(%ebp), %eax
	movl	(%eax), %edx
	movl	12(%ebp), %eax
	movl	%eax, 8(%edx)
	popl	%ebp
	ret
The addl is gone, but note that in the first case the result is written
into 4(%edx), while in the second into 8(%edx). My assembler times have
long gone for good, but to me this seems functionally equivalent.

W.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13005