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Ruixin Bao 98aa97806b cmd/compile: add math/bits.Mul64 intrinsic on s390x
This change adds an intrinsic for Mul64 on s390x. To achieve that,
a new assembly instruction, MLGR, is introduced in s390x/asmz.go. This assembly
instruction directly uses an existing instruction on Z and supports multiplication
of two 64 bit unsigned integer and stores the result in two separate registers.

In this case, we require the multiplcand to be stored in register R3 and
the output result (the high and low 64 bit of the product) to be stored in
R2 and R3 respectively.

A test case is also added.

Benchmark:
name      old time/op  new time/op  delta
Mul-18    11.1ns ± 0%   1.4ns ± 0%  -87.39%  (p=0.002 n=8+10)
Mul32-18  2.07ns ± 0%  2.07ns ± 0%     ~     (all equal)
Mul64-18  11.1ns ± 1%   1.4ns ± 0%  -87.42%  (p=0.000 n=10+10)

Change-Id: Ieca6ad1f61fff9a48a31d50bbd3f3c6d9e6675c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/194572
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-09-13 09:04:48 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api/go1.13: add debug/elf.Symbol fields added in CL 184099 2019-08-08 18:44:16 +00:00
doc doc/go1.14: start doc; note end of NaCl platform support 2019-09-12 16:15:01 +00:00
lib/time lib/time: update tz data to 2019b 2019-07-03 23:08:27 +00:00
misc misc/cgo/test: use __atomic intrinsics instead of __sync 2019-09-06 17:38:58 +00:00
src cmd/compile: add math/bits.Mul64 intrinsic on s390x 2019-09-13 09:04:48 +00:00
test cmd/compile: add math/bits.Mul64 intrinsic on s390x 2019-09-13 09:04:48 +00:00
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AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
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