[Bug rtl-optimization/64311] New: ICE: Max. number of generated reload insns per insn is achieved (90) with -fpic -march=corei7 for gcc.target/i386/avx512bw-vpbroadcast[bw]-1.c

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64311

            Bug ID: 64311
           Summary: ICE: Max. number of generated reload insns per insn is
                    achieved (90) with -fpic -march=corei7 for
                    gcc.target/i386/avx512bw-vpbroadcast[bw]-1.c
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com

As seen in [1], reproducible on x86_64-linux with "-mavx512bw -mavx512vl -O2
-fpic -m32 -march=corei7":

~/gcc-build/gcc/xgcc -B ~/gcc-build/gcc/ -mavx512bw -mavx512vl -O2 -fpic -m32
-march=corei7 -S avx512bw-vpbroadcastw-1.c  
avx512bw-vpbroadcastw-1.c: In function ‘avx512bw_test’:
avx512bw-vpbroadcastw-1.c:39:1: internal compiler error: Max. number of
generated reload insns per insn is achieved (90)

 }
 ^
0x9383d0 lra_constraints(bool)
        ../../gcc-svn/trunk/gcc/lra-constraints.c:4225
0x928301 lra(_IO_FILE*)
        ../../gcc-svn/trunk/gcc/lra.c:2277
0x8e6959 do_reload
        ../../gcc-svn/trunk/gcc/ira.c:5391
0x8e6959 execute
        ../../gcc-svn/trunk/gcc/ira.c:5561
Please submit a full bug report,

[1] https://gcc.gnu.org/ml/gcc-testresults/2014-12/msg01763.html
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/64309] if (1 & (1 << n)) not simplified to if (n == 0)
Date: Mon, 15 Dec 2014 08:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd309

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-15
          Component|rtl-optimization            |middle-end
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  Sth like

 (simplify
  (ne (bit_and (lshift integer_onep @0) integer_onep) integer_zerop)
  (eq @0 { build_zero_cst (TREE_TYPE (@0)); })

with eventually also covering if ((1 & (1<< n)) == 0) -> if (n & 1 == 0)

You can extend this to cover the other cases you mention.