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Hi Craig, I am Charles Li from Sony Playstation. We are doing x86 code gen testing and, by chance, we noticed that compiling the 64-bit assembly instruction<https://msdn.microsoft.com/en-us/library/windows/hardware/ff561499(v=vs.85).aspx> "jrcxz" in 32-bit mode "-m32" previously resulted in an error, now gets silently converted into the 32-bit equivalent instruction "jecxz". I have bisected this change in behavior down to r225075 - [X86] Make the instructions that use AdSize16/32/64 co-exist together without using...

...uot;pushfq") - return Error(NameLoc, "pushfq cannot be encoded in 32-bit mode"); + return Parser->Error(NameLoc, "pushfq cannot be encoded in 32-bit mode"); } // The "Jump if rCX Zero" form jcxz is not allowed in 64-bit mode and // the form jrcxz is not allowed in 32-bit mode. if (Is64Bit) { if (Name == "jcxz") - return Error(NameLoc, "jcxz cannot be encoded in 64-bit mode"); + return Parser->Error(NameLoc, "jcxz cannot be encoded in 64-bit mode"); } else { if (Name == "jrcxz&q...