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liblink: generate correct code for MOVD $-n(Rm), x on ppc64
On ppc64, liblink rewrites MOVD's of >32-bit constants by putting the constant in memory and rewriting the MOVD to load from that memory address. However, there were two bugs in the condition: a) owing to an incorrect sign extension, it triggered for all negative constants, and b) it could trigger for constant offsets from registers (addresses of the form $n(Rm) in assembly) Together, these meant instructions of the form MOVD $-n(Rm), x were compiled by putting -n in memory and rewriting the MOVD to load this constant from memory (completely dropping Rm). Change-Id: I1f6cc980efa3e3d6f164b46c985b2c3b55971cca Reviewed-on: https://go-review.googlesource.com/1752 Reviewed-by: Minux Ma <[email protected]>
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