Andrew Haley <[EMAIL PROTECTED]> writes: > On i386 we replace (add sp -4) with (push reg). This generates faster > and smaller code. > > However, we are not copying RTX_FRAME_RELATED_P from the old > instructions to the new, and so we are not emitting unwind information > for the stack pointer adjustment. The breaks stack traces on gcj, and > I suspect it breaks a bunch of stuff elsewhere too. > > This very crude patch sets RTX_FRAME_RELATED_P on every one of the new > instructions if any of the old instructions had RTX_FRAME_RELATED_P > set. It seems to do the trick, but I suspect there must be a more > subtle way to do it. > > Can anyone suggest a neater way to do this?
I don't have a suggestion for a neater way to do this, but I do want to note that, in the general case, just copying RTX_FRAME_RELATED_P is insufficient. We also need to copy any REG_FRAME_RELATED_EXPR reg notes. Ian
