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Paul E. Murphy 5a3d0f5a63 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>
2021-10-21 20:12:09 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api cmd/go: stamp VCS revision and uncommitted status into binaries 2021-10-14 18:44:37 +00:00
doc doc/go1.18: add release notes for build and VCS info 2021-10-15 20:29:48 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc misc/wasm: expect environment to provide polyfills 2021-10-16 14:50:21 +00:00
src cmd/internal/obj/ppc64: rework argument classifications 2021-10-21 20:12:09 +00:00
test cmd/compile: fix inlining of labeled for loops 2021-10-21 19:08:43 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
LICENSE
PATENTS
README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md

README.md

The Go Programming Language

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