crypto/internal/fips140/subtle: add assembly implementation of xorBytes for mipsx

crypto/internal/fips140/subtle: add assembly implementation of xorBytes for mipsx

goos: linux
goarch: mipsle
pkg: crypto/subtle
                                     │   osubtle    │              nsubtle               │
                                     │    sec/op    │   sec/op     vs base               │
ConstantTimeByteEq-4                    2.785n ± 0%   2.785n ± 0%        ~ (p=0.876 n=8)
ConstantTimeEq-4                        3.342n ± 0%   3.341n ± 0%        ~ (p=0.258 n=8)
ConstantTimeLessOrEq-4                  3.341n ± 0%   3.340n ± 0%        ~ (p=0.370 n=8)
XORBytes/8Bytes-4                      117.80n ± 0%   27.02n ± 2%  -77.07% (p=0.000 n=8)
XORBytes/128Bytes-4                    176.60n ± 0%   58.42n ± 4%  -66.92% (p=0.000 n=8)
XORBytes/2048Bytes-4                    996.5n ± 0%   462.4n ± 0%  -53.60% (p=0.000 n=8)
XORBytes/8192Bytes-4                    3.568µ ± 0%   1.780µ ± 2%  -50.13% (p=0.000 n=8)
XORBytes/32768Bytes-4                   19.34µ ± 6%   10.52µ ± 5%  -45.60% (p=0.000 n=8)
XORBytesAlignment/8Bytes0Offset-4      127.50n ± 0%   28.31n ± 1%  -77.80% (p=0.000 n=8)
XORBytesAlignment/8Bytes1Offset-4      105.65n ± 1%   28.20n ± 1%  -73.30% (p=0.000 n=8)
XORBytesAlignment/8Bytes2Offset-4      105.55n ± 1%   28.34n ± 1%  -73.15% (p=0.000 n=8)
XORBytesAlignment/8Bytes3Offset-4      105.65n ± 0%   28.45n ± 1%  -73.07% (p=0.000 n=8)
XORBytesAlignment/8Bytes4Offset-4      127.60n ± 0%   28.19n ± 1%  -77.91% (p=0.000 n=8)
XORBytesAlignment/8Bytes5Offset-4      105.45n ± 0%   28.38n ± 1%  -73.09% (p=0.000 n=8)
XORBytesAlignment/8Bytes6Offset-4      105.55n ± 0%   28.27n ± 1%  -73.22% (p=0.000 n=8)
XORBytesAlignment/8Bytes7Offset-4      105.60n ± 0%   28.24n ± 1%  -73.26% (p=0.000 n=8)
XORBytesAlignment/128Bytes0Offset-4    178.25n ± 0%   59.57n ± 0%  -66.58% (p=0.000 n=8)
XORBytesAlignment/128Bytes1Offset-4    313.25n ± 0%   75.32n ± 0%  -75.96% (p=0.000 n=8)
XORBytesAlignment/128Bytes2Offset-4    313.75n ± 0%   75.34n ± 0%  -75.99% (p=0.000 n=8)
XORBytesAlignment/128Bytes3Offset-4    314.25n ± 0%   75.31n ± 0%  -76.04% (p=0.000 n=8)
XORBytesAlignment/128Bytes4Offset-4    178.25n ± 0%   59.57n ± 0%  -66.58% (p=0.000 n=8)
XORBytesAlignment/128Bytes5Offset-4    314.20n ± 0%   75.80n ± 1%  -75.88% (p=0.000 n=8)
XORBytesAlignment/128Bytes6Offset-4    313.30n ± 0%   75.56n ± 0%  -75.88% (p=0.000 n=8)
XORBytesAlignment/128Bytes7Offset-4    313.95n ± 0%   75.45n ± 0%  -75.97% (p=0.000 n=8)
XORBytesAlignment/2048Bytes0Offset-4   1002.5n ± 0%   455.3n ± 0%  -54.58% (p=0.000 n=8)
XORBytesAlignment/2048Bytes1Offset-4   3649.5n ± 0%   731.6n ± 0%  -79.95% (p=0.000 n=8)
XORBytesAlignment/2048Bytes2Offset-4   3645.0n ± 0%   731.5n ± 0%  -79.93% (p=0.000 n=8)
XORBytesAlignment/2048Bytes3Offset-4   3656.0n ± 0%   731.6n ± 0%  -79.99% (p=0.000 n=8)
XORBytesAlignment/2048Bytes4Offset-4   1003.0n ± 0%   455.6n ± 0%  -54.58% (p=0.000 n=8)
XORBytesAlignment/2048Bytes5Offset-4   3651.5n ± 1%   736.6n ± 0%  -79.83% (p=0.000 n=8)
XORBytesAlignment/2048Bytes6Offset-4   3647.5n ± 0%   736.4n ± 0%  -79.81% (p=0.000 n=8)
XORBytesAlignment/2048Bytes7Offset-4   3657.0n ± 1%   736.6n ± 0%  -79.86% (p=0.000 n=8)
geomean                                 313.1n        96.95n       -69.03%

                                     │   osubtle    │                nsubtle                │
                                     │     B/s      │      B/s       vs base                │
XORBytes/8Bytes-4                      64.77Mi ± 0%   282.51Mi ± 2%  +336.18% (p=0.000 n=8)
XORBytes/128Bytes-4                    691.3Mi ± 0%   2092.3Mi ± 4%  +202.66% (p=0.000 n=8)
XORBytes/2048Bytes-4                   1.914Gi ± 0%    4.125Gi ± 0%  +115.51% (p=0.000 n=8)
XORBytes/8192Bytes-4                   2.138Gi ± 0%    4.288Gi ± 2%  +100.54% (p=0.000 n=8)
XORBytes/32768Bytes-4                  1.583Gi ± 6%    2.908Gi ± 5%   +83.61% (p=0.000 n=8)
XORBytesAlignment/8Bytes0Offset-4      59.83Mi ± 0%   269.47Mi ± 1%  +350.37% (p=0.000 n=8)
XORBytesAlignment/8Bytes1Offset-4      72.22Mi ± 0%   270.51Mi ± 1%  +274.56% (p=0.000 n=8)
XORBytesAlignment/8Bytes2Offset-4      72.28Mi ± 1%   269.19Mi ± 1%  +272.41% (p=0.000 n=8)
XORBytesAlignment/8Bytes3Offset-4      72.21Mi ± 0%   268.16Mi ± 1%  +271.38% (p=0.000 n=8)
XORBytesAlignment/8Bytes4Offset-4      59.79Mi ± 0%   270.67Mi ± 1%  +352.74% (p=0.000 n=8)
XORBytesAlignment/8Bytes5Offset-4      72.36Mi ± 0%   268.83Mi ± 1%  +271.49% (p=0.000 n=8)
XORBytesAlignment/8Bytes6Offset-4      72.29Mi ± 0%   269.95Mi ± 1%  +273.44% (p=0.000 n=8)
XORBytesAlignment/8Bytes7Offset-4      72.27Mi ± 0%   270.14Mi ± 1%  +273.79% (p=0.000 n=8)
XORBytesAlignment/128Bytes0Offset-4    684.7Mi ± 0%   2049.1Mi ± 0%  +199.26% (p=0.000 n=8)
XORBytesAlignment/128Bytes1Offset-4    389.7Mi ± 1%   1620.7Mi ± 0%  +315.86% (p=0.000 n=8)
XORBytesAlignment/128Bytes2Offset-4    389.1Mi ± 0%   1620.3Mi ± 0%  +316.41% (p=0.000 n=8)
XORBytesAlignment/128Bytes3Offset-4    388.4Mi ± 1%   1620.9Mi ± 0%  +317.29% (p=0.000 n=8)
XORBytesAlignment/128Bytes4Offset-4    684.8Mi ± 0%   2049.2Mi ± 0%  +199.24% (p=0.000 n=8)
XORBytesAlignment/128Bytes5Offset-4    388.5Mi ± 0%   1610.3Mi ± 1%  +314.47% (p=0.000 n=8)
XORBytesAlignment/128Bytes6Offset-4    389.6Mi ± 0%   1615.4Mi ± 0%  +314.60% (p=0.000 n=8)
XORBytesAlignment/128Bytes7Offset-4    388.9Mi ± 0%   1617.8Mi ± 1%  +316.04% (p=0.000 n=8)
XORBytesAlignment/2048Bytes0Offset-4   1.903Gi ± 3%    4.189Gi ± 3%  +120.18% (p=0.000 n=8)
XORBytesAlignment/2048Bytes1Offset-4   535.1Mi ± 0%   2669.7Mi ± 0%  +398.88% (p=0.000 n=8)
XORBytesAlignment/2048Bytes2Offset-4   535.8Mi ± 0%   2670.1Mi ± 0%  +398.34% (p=0.000 n=8)
XORBytesAlignment/2048Bytes3Offset-4   534.2Mi ± 0%   2669.6Mi ± 0%  +399.71% (p=0.000 n=8)
XORBytesAlignment/2048Bytes4Offset-4   1.902Gi ± 0%    4.187Gi ± 0%  +120.12% (p=0.000 n=8)
XORBytesAlignment/2048Bytes5Offset-4   534.9Mi ± 0%   2651.6Mi ± 0%  +395.73% (p=0.000 n=8)
XORBytesAlignment/2048Bytes6Offset-4   535.5Mi ± 0%   2652.3Mi ± 0%  +395.34% (p=0.000 n=8)
XORBytesAlignment/2048Bytes7Offset-4   534.1Mi ± 1%   2651.6Mi ± 0%  +396.46% (p=0.000 n=8)
geomean                                338.6Mi         1.205Gi       +264.51%

Change-Id: I4d7e759968779cf8470826b8662b9f2018e663bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/666275
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@google.com>