[Bug middle-end/61529] [5 Regression] ICE on valid code at -O3 on x86_64-linux-gnu in check_probability, at basic-block.h:953

["renlin.li at arm dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61529

Renlin Li <renlin.li at arm dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |renlin.li at arm dot com

--- Comment #5 from Renlin Li <renlin.li at arm dot com> ---
Confirm same problem while compiling glibc using arm toolchain with
-march=armv7-a -O2 configuration.


(In reply to David Binderman from comment #4)
> (In reply to Jakub Jelinek from comment #3)
> > Started with r210538.
> 
> I am seeing something similar when compiling glibc
> with trunk 20141001 with only -O2.
> 
> ../iconv/skeleton.c: In function ‘gconv’:
> ../iconv/skeleton.c:792:1: internal compiler error: in check_probability, at
> basic-block.h:959
>  }
>  ^
> 0x10685aa check_probability
>     ../../src/trunk/gcc/basic-block.h:959
> 0x10685aa apply_probability
>     ../../src/trunk/gcc/basic-block.h:988
> 0x10685aa compute_outgoing_frequencies
>     ../../src/trunk/gcc/cfgbuild.c:545
> 0x10685aa find_many_sub_basic_blocks(simple_bitmap_def*)
>     ../../src/trunk/gcc/cfgbuild.c:636
> 
> Code ok with 20140927.
>From gcc-bugs-return-464369-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 17 16:22:23 2014
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Subject: [Bug middle-end/61529] [5 Regression] ICE on valid code at -O3 on x86_64-linux-gnu in check_probability, at basic-block.h:953
Date: Fri, 17 Oct 2014 16:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida529

--- Comment #6 from Renlin Li <renlin.li at arm dot com> ---
emit_case_nodes calls conditional_probability with a very large first argument.

After GCOV_COMPUTE_SCALE calculation, the result overflows into a negative
number.

It's recorded into the cmp_and_jump rtx as a note which is later read and
trigger the assertion.