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Author SHA1 Message Date
Jakob Stoklund Olesen
6dee31aa07 When creating X86 MUL8 and DIV8 instructions, make sure we don't produce 
CopyFromReg nodes for aliasing registers (AX and AL). This confuses the fast
register allocator.

Instead of CopyFromReg(AL), use ExtractSubReg(CopyFromReg(AX), sub_8bit).

This fixes PR7312.

llvm-svn: 106934
 2010-06-26 00:39:23 +00:00