| commit | 5a3d0f5a6361a2a1ccba19ad8d8da8b4367ea2c9 | [log] [tgz] |
|---|---|---|
| author | Paul E. Murphy <murp@ibm.com> | Mon Aug 09 11:17:08 2021 -0500 |
| committer | Lynn Boger <laboger@linux.vnet.ibm.com> | Thu Oct 21 20:12:09 2021 +0000 |
| tree | 9896777c134a7daec6f77c893ad9293665cf82fb | |
| parent | b8da7e4c4c9e97b3d1ebfb07506acdd61277b988 [diff] |
cmd/internal/obj/ppc64: rework argument classifications This introduces a number of new classifications which will make it easier to generate functions to assemble the new instructions of ISA 3.1, and potentially earlier versions. No code generation changes should occur as a result of these. These allow finer control over how an opcode is matched to an optab entry. Literal values are now classified based on the smallest number of bits needed to encode, and matching rules will accept a literal if it can be zero/sign extended to fit a larger literal class. Likewise, support classifying even register numbers for GPR, VSX, and FPR instructions. Some instructions require and even/odd register pair, and these are usually represented by specifying the even register, and similarly encoded. Likewise, add a unit test for the argument classifier function (aclass). This caught an off-by-one bug in aclass which is also fixed. Updates #44549 Change-Id: Ia03013aea8b56c4d59b7c3812cdd67ddb3b720b9 Reviewed-on: https://go-review.googlesource.com/c/go/+/350152 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Run-TryBot: Cherry Mui <cherryyz@google.com> TryBot-Result: Go Bot <gobot@golang.org>
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