44a0da4ff1
Some arithmetic operation instructions such as ADD and SUB support two formats of left shift (<<) operation, namely shifted register format and extended register format. And the encoding, supported registers and shifted amount are both different. The assembly parser doesn't distinguish them and parses them into TYPE_SHIFT type, because the parser can't tell them apart and in most cases extended left-shift can be replaced by shifted left-shift. The only exception is when the second source register or the destination register is RSP. This CL converts this case into the extended format in the preprocess stage, which helps to simplify some of the logic of the new assembler implementation and also makes this situation look more reasonable. Change-Id: I2cd7d2d663b38a7ba77a9fef1092708b8cb9bc3d Reviewed-on: https://go-review.googlesource.com/c/go/+/311709 Trust: Eric Fang <eric.fang@arm.com> Run-TryBot: Eric Fang <eric.fang@arm.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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