a50c434308
These can be simplified with the knowledge of how arguments are assigned to obj.Prog objects on PPC64. If the argument is not a register type, the Reg argument (a2 in optab) of obj.Prog is not used, and those arguments are placed into RestArgs (a3, a4, a5 in optab). This relaxes the special case handling enforced by IsPPC64RLD and IsPPC64ISEL. Instead, arguments are assigned as noted above, and incorrect usage of such opcodes is checked by optab rules, not by the assembler front-end. Likewise, add support for handling 6 argument opcodes, these do not exist today, but will be added with ISA 3.1 (Power10). Finally, to maintain backwards compatibility, some 4-arg opcodes whose middle arguments are a register and immediate, could swap these arguments and generate identical machine code. This likely wasn't intended, but is possible. These are explicitly fixed up in the backend, and the asm tests are extended to check these. Change-Id: I5f8190212427dfe8e6f062185bfefb5fa4fd0e75 Reviewed-on: https://go-review.googlesource.com/c/go/+/427516 Reviewed-by: Cherry Mui <cherryyz@google.com> Run-TryBot: Paul Murphy <murp@ibm.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> |
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The Go Programming Language
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