commit 321771ee63740333ad355244e0764295218843b8

Author: Mark Wielaard <mark@klomp.org>

Date:   Sun Dec 9 14:26:39 2018 +0100

    memcheck: Allow unaligned loads of 128bit vectors on ppc64[le].

    On powerpc partial unaligned loads of vectors from partially invalid

    addresses are OK and could be generated by our translation of lxvd2x.

    Adjust partial_load memcheck tests to allow partial loads of 16 byte

    vectors on powerpc64.

    Part of resolving bug #386945.

diff --git a/memcheck/mc_main.c b/memcheck/mc_main.c

index 737f79d..101916b 100644

--- a/memcheck/mc_main.c

+++ b/memcheck/mc_main.c

@@ -1354,6 +1354,9 @@ void mc_LOADV_128_or_256_slow ( /*OUT*/ULong* res,

    tl_assert(szB == 16); // s390 doesn't have > 128 bit SIMD

    /* OK if all loaded bytes are from the same page. */

    Bool alignedOK = ((a & 0xfff) <= 0x1000 - szB);

+#  elif defined(VGA_ppc64be) || defined(VGA_ppc64le)

+   /* lxvd2x might generate an unaligned 128 bit vector load.  */

+   Bool alignedOK = (szB == 16);

 #  else

    /* OK if the address is aligned by the load size. */

    Bool alignedOK = (0 == (a & (szB - 1)));