https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63177
Carl Love <carll at gcc dot gnu.org> changed:
What |Removed |Added
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Assignee|unassigned at gcc dot gnu.org |carll at gcc dot gnu.org
--- Comment #7 from Carl Love <carll at gcc dot gnu.org> ---
So the bug only occurs if GCC is configured wfor power8 or you also use the
option -mcpu=power8 when compiling the test. If you configure with or use
-mcpu-power9 then the proper code generation is done.
Pat Haugen looked at this issue. It appears that GCC is calling the assembler
with -mpower9 causing the P9 "stxvx" instruction to be generated to store the
data in the correct order. In the case of power8 the compiler passes -mpower8
to the assembler which uses the "stxvx" extended mnemonic which maps to stxvd2x
which doesn't store the data in the correct order.
