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c6a56c8e99
The SSE4.1 pmovsx* and pmovzx* instructions take packed 1-byte, 2-byte or 4-byte inputs and sign-extend or zero-extend them to a wider vector output. The associated helpers for these instructions do the extension on each element in turn, starting with the lowest. If the input and output are the same register, this means that all the input elements after the first have been overwritten before they are read. This patch makes the helpers extend starting with the highest element, not the lowest, to avoid such overwriting. This fixes many GCC test failures (161 in the gcc testsuite in my GCC 6-based testing) when testing with a default CPU setting enabling those instructions. Signed-off-by: Joseph Myers <joseph@codesourcery.com> Message-Id: <alpine.DEB.2.20.1708082018390.23380@digraph.polyomino.org.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>