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Lynn Boger bdba55653f cmd/asm/internal,cmd/internal/obj/ppc64: add alignment directive to asm for ppc64x 
This adds support for an alignment directive that can be used
within Go asm to indicate preferred code alignment for ppc64x.
This is intended to be used with loops to improve
performance.

This change only adds the directive and aligns the code based
on it. Follow up changes will modify asm functions for
ppc64x that benefit from preferred alignment.

Fixes #14935

Here is one example of the improvement in memmove when the
directive is used on the loops in the code:

Memmove/64      8.74ns ± 0%    8.64ns ± 0%   -1.19%  (p=0.000 n=8+8)
Memmove/128     11.5ns ± 0%    11.0ns ± 0%   -4.35%  (p=0.000 n=8+8)
Memmove/256     23.0ns ± 0%    15.3ns ± 0%  -33.48%  (p=0.000 n=8+8)
Memmove/512     31.7ns ± 0%    31.8ns ± 0%   +0.32%  (p=0.000 n=8+8)
Memmove/1024    52.3ns ± 0%    43.9ns ± 0%  -16.10%  (p=0.000 n=8+8)
Memmove/2048    93.2ns ± 0%    76.2ns ± 0%  -18.24%  (p=0.000 n=8+8)
Memmove/4096     174ns ± 0%     141ns ± 0%  -18.97%  (p=0.000 n=8+8)

Change-Id: I200d77e923dd5d78c22fe3f8eb142a8fbaff57bf
Reviewed-on: https://go-review.googlesource.com/c/144218
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
2018-10-23 20:37:29 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: FreeBSD 12 ino64 support 2018-10-05 21:38:13 +00:00
doc doc: use the new log functions 2018-10-22 19:57:05 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc internal/traceparser: provide parser that uses less space and parses segments of runtime trace files 2018-10-23 14:00:14 +00:00
src cmd/asm/internal,cmd/internal/obj/ppc64: add alignment directive to asm for ppc64x 2018-10-23 20:37:29 +00:00
test cmd/compile: use proved bounds to remove signed division fix-ups 2018-10-23 02:29:44 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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README.md

The Go Programming Language

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