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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug regression/53729] New: [4.8 regression] PR53636 fix caused bb-slp-16.c to FAIL on sparc64 and powerpc64
Date: Wed, 20 Jun 2012 11:26:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53729

             Bug #: 53729
           Summary: [4.8 regression] PR53636 fix caused bb-slp-16.c to
                    FAIL on sparc64 and powerpc64
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mikpe@it.uu.se


The PR53636 fix caused

FAIL: gcc.dg/vect/bb-slp-16.c scan-tree-dump-times slp "basic block vectorized
using SLP" 1

on sparc64-linux.  Comparing the pre and post patch dumps for that file shows

 22: vect_compute_data_ref_alignment:
 22: misalign = 4 bytes of ref MEM[(unsigned int *)pout_90 + 28B]
 22: vect_compute_data_ref_alignment:
-22: force alignment of arr[i_87]
-22: misalign = 0 bytes of ref arr[i_87]
+22: SLP: step doesn't divide the vector-size.
+22: Unknown alignment for access: arr

(lots of stuff that's simply gone)

-22: BASIC BLOCK VECTORIZED
-
-22: basic block vectorized using SLP
+22: not vectorized: unsupported unaligned store.arr[i_87]
+22: not vectorized: unsupported alignment in basic block.

The same new FAIL also appears on powerpc64-linux.