tree 55d9ab25c1c9800de99c19896e333e49658b0990
parent 69d3f9c6698150a88fcc89a20bb93823895dfaf8
author Jim Stichnoth <stichnot@chromium.org> 1427148654 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1427148654 -0700

Subzero: Don't use key SSE instructions on potentially unaligned loads.

The non-mov-like SSE instructions generally require 16-byte aligned memory operands.  The PNaCl bitcode ABI only guarantees 4-byte alignment or less on vector loads and stores.  Subzero maintains stack alignment so stack memory operands are fine.

We handle this by legalizing memory operands into a register wherever there is doubt.

This bug was first discovered on the vector_align scons test.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4083
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4133
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1024253003