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[Bug bootstrap/61078] [5 Regression] ESA mode bootstrap failure since r209897
- From: "krebbel at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 25 Aug 2014 10:48:20 +0000
- Subject: [Bug bootstrap/61078] [5 Regression] ESA mode bootstrap failure since r209897
- Auto-submitted: auto-generated
- References: <bug-61078-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61078
Andreas Krebbel <krebbel at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2014-08-25
Ever confirmed|0 |1
--- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
The bash crash comes from using a miscompiled libgcc_s.so during gcc build.
There are "la r15,0(r15)" instructions everywhere in the code used for
decrementing the stack pointer where 0 is wrongly used as displacement. This in
turn is the result of being compiled by a miscompiled cc1plus. The following
negation of the frame size value in s390_emit_prologue function is wrongly
split by the negdi2_31 splitter.
...
if (cfun_frame_layout.frame_size > 0)
{
rtx frame_off = GEN_INT (-cfun_frame_layout.frame_size);
...