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From: "thejes.k at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/51819] New: [4.7 Regression ]Neon wrong code generation, Error: unsupported alignment for instruction -- `vst1.32 {d2[0]},[r0:64]'
Date: Wed, 11 Jan 2012 05:44:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51819

             Bug #: 51819
           Summary: [4.7 Regression ]Neon wrong code generation, Error:
                    unsupported alignment for instruction -- `vst1.32
                    {d2[0]},[r0:64]'
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: thejes.k@gmail.com
            Target: arm


With the gcc,
xgcc (4.7.0 20111217 (experimental) 

I tried to compile the code "gcc/testsuite/gcc.dg/vect/vect-double-reduc-6.c"
with neon options as shown below,

Command Line:

$ gcc-4.7-20111217/host-i686-pc-linux-gnu/gcc/xgcc
-B./gcc-4.7-20111217/host-i686-pc-linux-gnu/gcc vect-double-reduc-6.c
-ftree-vectorize -fno-vect-cost-model -ffast-math -O2 -funroll-loops
-fdump-tree-vect-details  -lm  -march=armv7-a -mthumb -mfpu=neon
-mfloat-abi=softfp  -o ./vect-double-reduc-6.exe 

/tmp/ccsaDvPz.s: Assembler messages: 
/tmp/ccsaDvPz.s:132: Error: unsupported alignment for instruction -- `vst1.32
{d2[0]},[r0:64]' 

I could not reproduce this issue with gcc-4.5-20111215 or  gcc-4.6-20111216 .
It seems this issue is caused by the revision 172314
http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01996.html.

This patch is not merged to gcc 4.5 or 4.6 also.