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From: "manjian2006 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/60438] dwarf2cfi :2239 still assert,not the same cause as PR 59575
Date: Fri, 07 Mar 2014 10:09:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60438

--- Comment #8 from linzj <manjian2006 at gmail dot com> ---
Okay let me sum it up:
at first the code looks like this
call xxx: .cfa 92
float ops
add sp 12 .cfa 80

And then split2 splits the float ops,then it looks like this
call xxx: .cfa 92
push edx
float ops2
add sp 4
...
add sp 12 .cfa 80

Note that the split code has a sp ops but no cfa notes.
And then cfa feels that's ugly,it changes the code to
call xxx : .cfa 92
push edx
float ops2
...
add sp 16 .cfa 80

And then jump2 finds another branch also has an "add sp 16 .cfa 80",so the
combination has occurred:
call xxx :.cfa 92
push edx
float ops2
...
label jump_from_other_branch ( (hasRelativeWidth || hasRelativeHeight) == true
)
add sp 16 .cfa 80


then dwarf2cfi.c will first find the "add sp 16 .cfa 80" row has cfa 92 coming
first,and then cfa 96.