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2011 Sep 21
1
[LLVMdev] Instruction Selection
...target, this means that the result of an addition will always be an RC2 register. Depending on how the result is used, sometimes this is fine but other times it would be better (avoid a register-register copy) if the result were in an RC1 register. For example: LOAD mem,$RC1_a LEA $RC2_a,$RC2_b,$RC1_a MOV $RC2_a,$RC1_a needs an additional register and is larger and slower than MOV $RC2_b,$RC1_a ADD mem,$RC1_a But LEA $RC2_a,$RC2_b,#8 is much better then MOV $RC2_b,$RC1_a ADD #8,$RC1_a MOV $RC1_a,$RC2_a My problem therefore is that statically prioritising...