[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #8 from rguenth at gcc dot gnu dot org 2005-11-19 10:12 --- Bootstrapped and regtested on s390-linux-gnu for all default languages. We already branched, so I leave it to you comitting the patch. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #7 from mmitchel at gcc dot gnu dot org 2005-11-19 02:16 --- S390 is not release critical. -- mmitchel at gcc dot gnu dot org changed: What|Removed |Added Priority|P3 |P5 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #6 from rguenth at gcc dot gnu dot org 2005-11-18 20:30 --- I'll do it. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
-- pinskia at gcc dot gnu dot org changed: What|Removed |Added Target Milestone|--- |4.1.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #5 from ian at airs dot com 2005-11-18 20:13 --- Created an attachment (id=10277) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10277&action=view) Patch This patch appears to fix the problem. However, I am about to leave for the weekend, and won't be back until Monday. Given that we are about to branch, I would greatly appreciate if somebody else could run a bootstrap and testsuite run. I will preapprove the patch if those pass. (Otherwise I will tackle it on Monday, but it would be nice to get it done before then. Thanks!) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #4 from uweigand at gcc dot gnu dot org 2005-11-17 12:45 --- It looks like the simplify-rtx patch is not really the cause of the problem, it simply exposes a pre-existing bug in combine and/or flow. Before combine, we have a situation that looks like (simplified): insn 82: reg46 = reg49 ^ reg50 (REG_DEAD reg49) insn 87: reg50 = reg46 ^ reg50 (REG_READ reg46) Note that reg 50 is live both at the start and the end of the current basic block. Now, due to the improved XOR optimization in simplify-rtx, combine recognized these insn can be combined into: insn 87: reg50 = reg49 (REG_READ reg49) And suddenly reg50 is no longer live at the start of this basic block. Unfortunately, there appears to be no code in combine that recognizes this fact and schedules the basic block for updating of global life info. (The only cases where that happens are related to moving REG_DEAD notes, but in this situation we don't *have* a REG_DEAD note for reg50 in the first place.) Thus, reg50 remains marked live-at-start in this basic block, and when a later pass does a local live info update on the block, the sanity check in verify_local_life_at_start triggers. Right now I don't know how and where to fix this. -- uweigand at gcc dot gnu dot org changed: What|Removed |Added Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|-00-00 00:00:00 |2005-11-17 12:45:27 date|| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #3 from saurabh dot verma at codito dot com 2005-11-17 10:05 --- Adding myself to CC list, as the offending patch was given by me -- saurabh dot verma at codito dot com changed: What|Removed |Added CC||saurabh dot verma at codito ||dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #2 from janis at gcc dot gnu dot org 2005-11-16 19:31 --- A regression hunt using an s390-linux cross compiler on powerpc-linux identified the following patch: http://gcc.gnu.org/viewcvs?view=rev&rev=103955 r103955 | ian | 2005-09-06 17:51:48 + (Tue, 06 Sep 2005) | 3 lines * simplify-rtx.c (simplify_binary_operation_1): Correct the condition for detecting cases like (a&a) and (a^a). -- janis at gcc dot gnu dot org changed: What|Removed |Added CC||ian at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
[Bug rtl-optimization/24883] [4.1 Regression] fatal error: internal consistency failure building xorg-x11
--- Comment #1 from rguenth at gcc dot gnu dot org 2005-11-15 22:03 --- Created an attachment (id=10245) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10245&action=view) reduced testcase testcase -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24883
