tree 8078dcd76fb26c6d8bbcf48a3560edae2599d2b2
parent 0dadd146a6258db564253731283918be931ed9ae
author Sam Lantinga <slouken@libsdl.org> 1567785019 -0700
committer Sam Lantinga <slouken@libsdl.org> 1567785019 -0700

SDL_blit_N.c: Correct vec_perm() application on little-endian 64-bit PowerPC

The LE transformation for vec_perm has an implicit assumption that the
permutation is being used to reorder vector elements (in this case 4-byte
integer word elements), not to reorder bytes within those elements.  Although
this is legal behavior, it is not anticipated by the transformation performed
by the compilers.

This causes pygame-1.9.1 test failure on PPC64LE because blitted pixmaps are
corrupted there due to how SDL uses vec_perm().

From RedHat / Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1392465
Original patch was provided by: Menanteau Guy <menantea@linux.vnet.ibm.com>