Hi Bernd,
   I think about whether the best mode is so important to x86_64.There
   is no mov r/m64,imm64 refering to Intel Software Developer's Manual
   Volume 2A 3-505.imm32 is the biggest number.And asan clears stack
   using imms.
   And even if there is a mov r/m64,imm64 in the future.The gcc peephole
   pass will do its job.These constant moves will get combined.
   So Maybe the best mode is not so important.
--
Regards
lin zuojian

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