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cmd/internal/obj/ppc64: fix wrong register encoding in XX1-Form instr…
…uctions A bug in the encoding of XX1-Form is flipping bit 31 of such instructions. This may result in register clobering when using VSX instructions. This was not exposed before because we currently don't generate these instructions in SSA, and the asm files in which they are present aren't affected by register clobbering. This change fixes the bug and adds a testcase for the problem. Fixes #30112 Change-Id: I77b606159ae1efea33d2ba3e1c74b7fae8d5d2e7 Reviewed-on: https://go-review.googlesource.com/c/go/+/163759 Reviewed-by: Bryan C. Mills <bcmills@google.com> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Run-TryBot: Bryan C. Mills <bcmills@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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