cmd/go: add GOMIPS32, GOMIPS64 ISA levels (iii, r1, r2, r5, r6)

[HeliC829]

Currently GOMIPS64 accepts hardfloat(as default) and softfloat.

Golang currently support MIPS III or higher. I had submitted two CLs and they take little performance improvement to MIPS64. CL 485635 CL 485595. But those instructions only available after r1 but not MIPS III.

So if we want to get more performance improvement on mips64, we should support more isa level.

We wish that GOMIPS can also accept r2/r5.

I tried introduce some instructions from MIPS R2. The following data shows the test results and performance improvement if we can support newer isa level on mips64x..

goos: linux
goarch: mips64le
pkg: crypto/tls
                                                 │    oldtls     │               newtls                │
                                                 │    sec/op     │    sec/op     vs base               │
CertCache/0-4                                       5.839m ±  6%   6.417m ±  8%   +9.91% (p=0.001 n=8)
CertCache/1-4                                       6.277m ±  6%   6.246m ±  7%        ~ (p=0.721 n=8)
CertCache/2-4                                       6.119m ± 14%   6.305m ±  7%   +3.04% (p=0.050 n=8)
CertCache/3-4                                       6.115m ± 10%   6.542m ± 11%   +6.98% (p=0.038 n=8)
HandshakeServer/RSA-4                               6.293m ±  1%   6.214m ±  0%   -1.26% (p=0.002 n=8)
HandshakeServer/ECDHE-P256-RSA/TLSv13-4             11.57m ±  0%   11.34m ±  1%   -1.98% (p=0.010 n=8)
HandshakeServer/ECDHE-P256-RSA/TLSv12-4             10.89m ±  0%   10.79m ±  0%   -0.88% (p=0.000 n=8)
HandshakeServer/ECDHE-P256-ECDSA-P256/TLSv13-4      7.247m ±  1%   7.008m ±  1%   -3.29% (p=0.007 n=8)
HandshakeServer/ECDHE-P256-ECDSA-P256/TLSv12-4      6.592m ±  0%   6.496m ±  0%   -1.46% (p=0.000 n=8)
HandshakeServer/ECDHE-X25519-ECDSA-P256/TLSv13-4    5.356m ±  3%   5.172m ±  3%   -3.45% (p=0.015 n=8)
HandshakeServer/ECDHE-X25519-ECDSA-P256/TLSv12-4    4.686m ±  1%   4.566m ±  0%   -2.56% (p=0.000 n=8)
HandshakeServer/ECDHE-P521-ECDSA-P521/TLSv13-4      220.2m ±  0%   217.4m ±  0%   -1.26% (p=0.000 n=8)
HandshakeServer/ECDHE-P521-ECDSA-P521/TLSv12-4      219.6m ±  0%   216.9m ±  0%   -1.25% (p=0.000 n=8)
Throughput/MaxPacket/1MB/TLSv12-4                   519.1m ±  1%   148.1m ±  2%  -71.47% (p=0.000 n=8)
Throughput/MaxPacket/1MB/TLSv13-4                   537.9m ±  0%   164.5m ±  1%  -69.42% (p=0.000 n=8)
Throughput/MaxPacket/2MB/TLSv12-4                  1028.5m ±  0%   279.3m ±  1%  -72.85% (p=0.000 n=8)
Throughput/MaxPacket/2MB/TLSv13-4                  1063.3m ±  0%   313.1m ±  1%  -70.56% (p=0.000 n=8)
Throughput/MaxPacket/4MB/TLSv12-4                  2036.4m ±  0%   552.1m ±  1%  -72.89% (p=0.000 n=8)
Throughput/MaxPacket/4MB/TLSv13-4                  2106.4m ±  0%   614.5m ±  1%  -70.83% (p=0.000 n=8)
Throughput/MaxPacket/8MB/TLSv12-4                    4.064 ±  0%    1.080 ±  4%  -73.43% (p=0.000 n=8)
Throughput/MaxPacket/8MB/TLSv13-4                    4.198 ±  0%    1.212 ±  7%  -71.12% (p=0.000 n=8)
Throughput/MaxPacket/16MB/TLSv12-4                   8.115 ±  1%    2.202 ±  7%  -72.87% (p=0.000 n=8)
Throughput/MaxPacket/16MB/TLSv13-4                   8.383 ±  0%    2.403 ±  1%  -71.33% (p=0.000 n=8)
Throughput/MaxPacket/32MB/TLSv12-4                  16.198 ±  0%    4.283 ±  0%  -73.56% (p=0.000 n=8)
Throughput/MaxPacket/32MB/TLSv13-4                  16.763 ±  0%    4.792 ±  1%  -71.42% (p=0.000 n=8)
Throughput/MaxPacket/64MB/TLSv12-4                  32.388 ±  0%    8.603 ±  2%  -73.44% (p=0.000 n=8)
Throughput/MaxPacket/64MB/TLSv13-4                  33.502 ±  0%    9.636 ±  1%  -71.24% (p=0.000 n=8)
Throughput/DynamicPacket/1MB/TLSv12-4               514.2m ±  1%   146.3m ±  1%  -71.55% (p=0.000 n=8)
Throughput/DynamicPacket/1MB/TLSv13-4               531.9m ±  1%   162.4m ±  2%  -69.47% (p=0.000 n=8)
Throughput/DynamicPacket/2MB/TLSv12-4              1019.8m ±  3%   279.2m ±  3%  -72.62% (p=0.000 n=8)
Throughput/DynamicPacket/2MB/TLSv13-4              1056.9m ±  0%   311.2m ±  1%  -70.56% (p=0.000 n=8)
Throughput/DynamicPacket/4MB/TLSv12-4              2031.2m ±  1%   547.3m ±  1%  -73.06% (p=0.000 n=8)
Throughput/DynamicPacket/4MB/TLSv13-4              2102.5m ±  0%   608.2m ±  1%  -71.07% (p=0.000 n=8)
Throughput/DynamicPacket/8MB/TLSv12-4                4.053 ±  0%    1.082 ±  1%  -73.31% (p=0.000 n=8)
Throughput/DynamicPacket/8MB/TLSv13-4                4.193 ±  0%    1.216 ±  1%  -70.99% (p=0.000 n=8)
Throughput/DynamicPacket/16MB/TLSv12-4               8.104 ±  1%    2.151 ±  2%  -73.46% (p=0.000 n=8)
Throughput/DynamicPacket/16MB/TLSv13-4               8.388 ±  0%    2.406 ±  1%  -71.32% (p=0.000 n=8)
Throughput/DynamicPacket/32MB/TLSv12-4              16.202 ±  0%    4.287 ±  1%  -73.54% (p=0.000 n=8)
Throughput/DynamicPacket/32MB/TLSv13-4              16.761 ±  0%    4.869 ±  2%  -70.95% (p=0.000 n=8)
Throughput/DynamicPacket/64MB/TLSv12-4              32.394 ±  0%    8.589 ±  2%  -73.49% (p=0.000 n=8)
Throughput/DynamicPacket/64MB/TLSv13-4              33.500 ±  0%    9.610 ±  3%  -71.31% (p=0.000 n=8)
Latency/MaxPacket/200kbps/TLSv12-4                  719.9m ±  0%   712.3m ±  0%   -1.06% (p=0.000 n=8)
Latency/MaxPacket/200kbps/TLSv13-4                  722.7m ±  0%   714.5m ±  0%   -1.13% (p=0.000 n=8)
Latency/MaxPacket/500kbps/TLSv12-4                  303.9m ±  0%   296.1m ±  0%   -2.57% (p=0.000 n=8)
Latency/MaxPacket/500kbps/TLSv13-4                  304.5m ±  0%   296.3m ±  0%   -2.68% (p=0.000 n=8)
Latency/MaxPacket/1000kbps/TLSv12-4                 165.5m ±  0%   157.5m ±  0%   -4.85% (p=0.000 n=8)
Latency/MaxPacket/1000kbps/TLSv13-4                 165.0m ±  0%   156.6m ±  0%   -5.07% (p=0.000 n=8)
Latency/MaxPacket/2000kbps/TLSv12-4                 96.05m ±  0%   88.17m ±  0%   -8.21% (p=0.000 n=8)
Latency/MaxPacket/2000kbps/TLSv13-4                 95.48m ±  0%   87.23m ±  0%   -8.65% (p=0.000 n=8)
Latency/MaxPacket/5000kbps/TLSv12-4                 54.42m ±  1%   46.43m ±  0%  -14.68% (p=0.000 n=8)
Latency/MaxPacket/5000kbps/TLSv13-4                 54.75m ±  0%   46.36m ±  0%  -15.33% (p=0.000 n=8)
Latency/DynamicPacket/200kbps/TLSv12-4              152.4m ±  0%   149.2m ±  0%   -2.13% (p=0.000 n=8)
Latency/DynamicPacket/200kbps/TLSv13-4              153.8m ±  0%   151.6m ±  0%   -1.48% (p=0.000 n=8)
Latency/DynamicPacket/500kbps/TLSv12-4              73.47m ±  0%   69.92m ±  1%   -4.84% (p=0.000 n=8)
Latency/DynamicPacket/500kbps/TLSv13-4              72.63m ±  1%   70.06m ±  0%   -3.54% (p=0.000 n=8)
Latency/DynamicPacket/1000kbps/TLSv12-4             47.15m ±  0%   43.59m ±  0%   -7.55% (p=0.000 n=8)
Latency/DynamicPacket/1000kbps/TLSv13-4             45.26m ±  1%   42.60m ±  1%   -5.88% (p=0.000 n=8)
Latency/DynamicPacket/2000kbps/TLSv12-4             33.88m ±  0%   30.25m ±  0%  -10.70% (p=0.000 n=8)
Latency/DynamicPacket/2000kbps/TLSv13-4             31.90m ±  1%   29.36m ±  0%   -7.96% (p=0.000 n=8)
Latency/DynamicPacket/5000kbps/TLSv12-4             25.60m ±  0%   21.99m ±  1%  -14.12% (p=0.000 n=8)
Latency/DynamicPacket/5000kbps/TLSv13-4             24.41m ±  0%   21.93m ±  1%  -10.19% (p=0.000 n=8)
geomean                                             346.1m         188.9m        -45.43%

                                       │    oldtls     │                newtls                 │
                                       │      B/s      │      B/s       vs base                │
Throughput/MaxPacket/1MB/TLSv12-4        1.926Mi ±  1%   6.752Mi ± 13%  +250.50% (p=0.000 n=8)
Throughput/MaxPacket/1MB/TLSv13-4        1.860Mi ±  1%   6.080Mi ±  4%  +226.92% (p=0.000 n=8)
Throughput/MaxPacket/2MB/TLSv12-4        1.945Mi ±  0%   7.162Mi ±  3%  +268.14% (p=0.000 n=8)
Throughput/MaxPacket/2MB/TLSv13-4        1.884Mi ±  4%   6.390Mi ± 21%  +239.24% (p=0.000 n=8)
Throughput/MaxPacket/4MB/TLSv12-4        1.965Mi ±  2%   7.243Mi ±  4%  +268.69% (p=0.000 n=8)
Throughput/MaxPacket/4MB/TLSv13-4        1.898Mi ±  1%   6.509Mi ±  5%  +242.96% (p=0.000 n=8)
Throughput/MaxPacket/8MB/TLSv12-4        1.969Mi ±  0%   7.405Mi ±  6%  +276.03% (p=0.000 n=8)
Throughput/MaxPacket/8MB/TLSv13-4        1.907Mi ±  0%   6.599Mi ± 18%  +246.00% (p=0.000 n=8)
Throughput/MaxPacket/16MB/TLSv12-4       1.974Mi ±  1%   7.262Mi ±  8%  +267.87% (p=0.000 n=8)
Throughput/MaxPacket/16MB/TLSv13-4       1.907Mi ±  4%   6.657Mi ±  2%  +249.00% (p=0.000 n=8)
Throughput/MaxPacket/32MB/TLSv12-4       1.974Mi ±  2%   7.467Mi ±  3%  +278.26% (p=0.000 n=8)
Throughput/MaxPacket/32MB/TLSv13-4       1.907Mi ±  1%   6.680Mi ±  1%  +250.25% (p=0.000 n=8)
Throughput/MaxPacket/64MB/TLSv12-4       1.974Mi ±  2%   7.439Mi ±  3%  +276.81% (p=0.000 n=8)
Throughput/MaxPacket/64MB/TLSv13-4       1.912Mi ±  1%   6.642Mi ±  2%  +247.38% (p=0.000 n=8)
Throughput/DynamicPacket/1MB/TLSv12-4    1.945Mi ± 12%   6.838Mi ±  8%  +251.47% (p=0.000 n=8)
Throughput/DynamicPacket/1MB/TLSv13-4    1.879Mi ±  1%   6.156Mi ±  3%  +227.66% (p=0.000 n=8)
Throughput/DynamicPacket/2MB/TLSv12-4    1.965Mi ± 11%   7.167Mi ± 16%  +264.81% (p=0.000 n=8)
Throughput/DynamicPacket/2MB/TLSv13-4    1.893Mi ±  1%   6.428Mi ±  2%  +239.55% (p=0.000 n=8)
Throughput/DynamicPacket/4MB/TLSv12-4    1.969Mi ±  1%   7.310Mi ±  6%  +271.19% (p=0.000 n=8)
Throughput/DynamicPacket/4MB/TLSv13-4    1.903Mi ±  0%   6.576Mi ±  2%  +245.61% (p=0.000 n=8)
Throughput/DynamicPacket/8MB/TLSv12-4    1.974Mi ±  1%   7.396Mi ± 10%  +274.64% (p=0.000 n=8)
Throughput/DynamicPacket/8MB/TLSv13-4    1.907Mi ±  1%   6.576Mi ±  3%  +244.75% (p=0.000 n=8)
Throughput/DynamicPacket/16MB/TLSv12-4   1.974Mi ±  3%   7.439Mi ±  3%  +276.81% (p=0.000 n=8)
Throughput/DynamicPacket/16MB/TLSv13-4   1.907Mi ±  1%   6.647Mi ±  4%  +248.50% (p=0.000 n=8)
Throughput/DynamicPacket/32MB/TLSv12-4   1.974Mi ±  0%   7.463Mi ± 10%  +278.02% (p=0.000 n=8)
Throughput/DynamicPacket/32MB/TLSv13-4   1.907Mi ±  1%   6.576Mi ±  2%  +244.75% (p=0.000 n=8)
Throughput/DynamicPacket/64MB/TLSv12-4   1.974Mi ±  0%   7.448Mi ±  3%  +277.29% (p=0.000 n=8)
Throughput/DynamicPacket/64MB/TLSv13-4   1.912Mi ±  1%   6.661Mi ±  4%  +248.38% (p=0.000 n=8)
geomean                                  1.931Mi         6.878Mi        +256.13%

goos: linux
goarch: mips64le
pkg: crypto/md5
                      │    oldmd5    │               newmd5               │
                      │    sec/op    │   sec/op     vs base               │
Hash8Bytes-4             2.712µ ± 0%   2.514µ ± 0%   -7.28% (p=0.000 n=8)
Hash64-4                 3.387µ ± 0%   2.999µ ± 0%  -11.46% (p=0.000 n=8)
Hash128-4                4.115µ ± 0%   3.527µ ± 0%  -14.30% (p=0.000 n=8)
Hash256-4                5.569µ ± 0%   4.583µ ± 0%  -17.71% (p=0.000 n=8)
Hash512-4                8.492µ ± 0%   6.709µ ± 0%  -21.00% (p=0.000 n=8)
Hash1K-4                 14.31µ ± 0%   10.94µ ± 0%  -23.57% (p=0.000 n=8)
Hash8K-4                 95.82µ ± 0%   70.18µ ± 0%  -26.76% (p=0.000 n=8)
Hash1M-4                11.933m ± 0%   8.674m ± 0%  -27.31% (p=0.000 n=8)
Hash8M-4                 95.45m ± 0%   69.40m ± 0%  -27.29% (p=0.000 n=8)
Hash8BytesUnaligned-4    2.784µ ± 0%   2.588µ ± 0%   -7.04% (p=0.000 n=8)
Hash1KUnaligned-4        14.31µ ± 0%   10.95µ ± 0%  -23.48% (p=0.000 n=8)
Hash8KUnaligned-4        95.76µ ± 0%   70.23µ ± 0%  -26.66% (p=0.000 n=8)
geomean                  38.51µ        30.88µ       -19.82%

                      │    oldmd5     │                newmd5                │
                      │      B/s      │      B/s       vs base               │
Hash8Bytes-4            2.813Mi ±  0%    3.033Mi ± 0%   +7.80% (p=0.000 n=8)
Hash64-4                18.02Mi ±  0%    20.35Mi ± 0%  +12.91% (p=0.000 n=8)
Hash128-4               29.66Mi ±  0%    34.61Mi ± 0%  +16.69% (p=0.000 n=8)
Hash256-4               43.85Mi ±  0%    53.27Mi ± 0%  +21.50% (p=0.000 n=8)
Hash512-4               57.50Mi ±  0%    72.78Mi ± 0%  +26.59% (p=0.000 n=8)
Hash1K-4                68.25Mi ±  0%    89.30Mi ± 0%  +30.84% (p=0.000 n=8)
Hash8K-4                81.53Mi ±  0%   111.33Mi ± 0%  +36.54% (p=0.000 n=8)
Hash1M-4                83.80Mi ± 28%   115.29Mi ± 0%  +37.58% (p=0.000 n=8)
Hash8M-4                83.82Mi ±  0%   115.27Mi ± 0%  +37.52% (p=0.000 n=8)
Hash8BytesUnaligned-4   2.737Mi ±  0%    2.947Mi ± 0%   +7.67% (p=0.000 n=8)
Hash1KUnaligned-4       68.24Mi ±  0%    89.19Mi ± 0%  +30.69% (p=0.000 n=8)
Hash8KUnaligned-4       81.59Mi ±  0%   111.24Mi ± 0%  +36.34% (p=0.000 n=8)
geomean                 33.84Mi          42.21Mi       +24.72%

goos: linux
goarch: mips64le
pkg: crypto/sha1
                   │   oldsha1   │              newsha1               │
                   │   sec/op    │   sec/op     vs base               │
Hash8Bytes/New-4     5.341µ ± 0%   4.863µ ± 0%   -8.95% (p=0.000 n=8)
Hash8Bytes/Sum-4     5.456µ ± 0%   4.983µ ± 0%   -8.68% (p=0.000 n=8)
Hash320Bytes/New-4   16.69µ ± 0%   13.85µ ± 0%  -17.00% (p=0.000 n=8)
Hash320Bytes/Sum-4   16.81µ ± 0%   13.97µ ± 0%  -16.92% (p=0.000 n=8)
Hash1K/New-4         42.90µ ± 0%   34.81µ ± 0%  -18.87% (p=0.000 n=8)
Hash1K/Sum-4         43.02µ ± 0%   34.94µ ± 0%  -18.80% (p=0.000 n=8)
Hash8K/New-4         309.6µ ± 0%   248.3µ ± 0%  -19.78% (p=0.000 n=8)
Hash8K/Sum-4         309.5µ ± 0%   248.5µ ± 0%  -19.71% (p=0.000 n=8)
geomean              33.11µ        27.75µ       -16.20%

                   │   oldsha1    │               newsha1               │
                   │     B/s      │     B/s       vs base               │
Hash8Bytes/New-4     1.431Mi ± 1%   1.574Mi ± 1%  +10.00% (p=0.000 n=8)
Hash8Bytes/Sum-4     1.402Mi ± 1%   1.535Mi ± 1%   +9.52% (p=0.000 n=8)
Hash320Bytes/New-4   18.29Mi ± 0%   22.04Mi ± 0%  +20.49% (p=0.000 n=8)
Hash320Bytes/Sum-4   18.15Mi ± 0%   21.85Mi ± 0%  +20.39% (p=0.000 n=8)
Hash1K/New-4         22.76Mi ± 1%   28.06Mi ± 0%  +23.25% (p=0.000 n=8)
Hash1K/Sum-4         22.70Mi ± 0%   27.95Mi ± 0%  +23.13% (p=0.000 n=8)
Hash8K/New-4         25.24Mi ± 0%   31.46Mi ± 0%  +24.64% (p=0.000 n=8)
Hash8K/Sum-4         25.24Mi ± 0%   31.44Mi ± 0%  +24.54% (p=0.000 n=8)
geomean              11.03Mi        13.16Mi       +19.35%

goos: linux
goarch: mips64le
pkg: math/bits
                  │   oldbits    │              newbits               │
                  │    sec/op    │   sec/op     vs base               │
LeadingZeros-4      20.505n ± 1%   6.780n ± 0%  -66.93% (p=0.000 n=8)
LeadingZeros8-4     10.040n ± 0%   9.039n ± 0%   -9.98% (p=0.000 n=8)
LeadingZeros16-4    19.085n ± 0%   9.038n ± 0%  -52.64% (p=0.000 n=8)
LeadingZeros32-4     24.13n ± 0%   10.55n ± 0%  -56.28% (p=0.000 n=8)
LeadingZeros64-4    19.660n ± 0%   6.776n ± 0%  -65.54% (p=0.000 n=8)
TrailingZeros-4     13.055n ± 0%   9.037n ± 0%  -30.77% (p=0.000 n=8)
TrailingZeros8-4     7.364n ± 0%   7.364n ± 0%        ~ (p=0.449 n=8)
TrailingZeros16-4    17.07n ± 0%   10.05n ± 0%  -41.14% (p=0.000 n=8)
TrailingZeros32-4   17.405n ± 0%   8.534n ± 0%  -50.97% (p=0.000 n=8)
TrailingZeros64-4   13.050n ± 0%   9.037n ± 0%  -30.75% (p=0.000 n=8)
OnesCount-4          21.09n ± 0%   21.10n ± 0%        ~ (p=0.054 n=8)
OnesCount8-4         6.024n ± 0%   6.024n ± 0%        ~ (p=0.533 n=8)
OnesCount16-4        13.05n ± 0%   13.05n ± 0%        ~ (p=1.000 n=8)
OnesCount32-4        20.08n ± 0%   20.08n ± 0%        ~ (p=0.367 n=8)
OnesCount64-4        23.10n ± 0%   23.11n ± 0%        ~ (p=0.407 n=8)
RotateLeft-4         9.037n ± 0%   4.418n ± 0%  -51.11% (p=0.000 n=8)
RotateLeft8-4        9.537n ± 0%   9.208n ± 0%   -3.45% (p=0.000 n=8)
RotateLeft16-4       9.208n ± 0%   9.375n ± 0%   +1.82% (p=0.000 n=8)
RotateLeft32-4      10.380n ± 0%   4.021n ± 0%  -61.26% (p=0.000 n=8)
RotateLeft64-4       8.034n ± 0%   4.016n ± 0%  -50.01% (p=0.000 n=8)
Reverse-4            62.26n ± 0%   18.08n ± 0%  -70.96% (p=0.000 n=8)
Reverse8-4           5.020n ± 0%   5.021n ± 0%        ~ (p=1.000 n=8)
Reverse16-4          9.036n ± 0%   9.039n ± 0%        ~ (p=0.098 n=8)
Reverse32-4          29.13n ± 0%   23.11n ± 0%  -20.68% (p=0.000 n=8)
Reverse64-4          27.50n ± 0%   21.10n ± 0%  -23.27% (p=0.000 n=8)
ReverseBytes-4      13.970n ± 1%   3.044n ± 1%  -78.21% (p=0.000 n=8)
ReverseBytes16-4     4.297n ± 1%   4.329n ± 1%   +0.74% (p=0.050 n=8)
ReverseBytes32-4    12.050n ± 0%   5.021n ± 0%  -58.34% (p=0.000 n=8)
ReverseBytes64-4    17.220n ± 2%   3.030n ± 0%  -82.40% (p=0.000 n=8)
Add-4                8.178n ± 0%   8.188n ± 0%        ~ (p=0.661 n=8)
Add32-4              8.284n ± 0%   8.285n ± 0%        ~ (p=0.292 n=8)
Add64-4              7.890n ± 1%   7.876n ± 0%        ~ (p=0.522 n=8)
Add64multiple-4      17.08n ± 0%   17.08n ± 0%        ~ (p=0.297 n=8)
Sub-4                9.543n ± 0%   9.540n ± 0%        ~ (p=0.312 n=8)
Sub32-4              13.07n ± 0%   13.05n ± 0%   -0.08% (p=0.011 n=8)
Sub64-4              10.30n ± 0%   10.29n ± 0%        ~ (p=0.080 n=8)
Sub64multiple-4      19.09n ± 0%   19.08n ± 0%   -0.05% (p=0.008 n=8)
Mul-4                5.100n ± 0%   5.097n ± 0%        ~ (p=0.338 n=8)
Mul32-4              7.371n ± 0%   7.363n ± 0%   -0.11% (p=0.000 n=8)
Mul64-4              5.242n ± 0%   5.020n ± 0%   -4.24% (p=0.000 n=8)
Div-4                133.6n ± 0%   118.4n ± 0%  -11.38% (p=0.000 n=8)
Div32-4              15.65n ± 1%   15.41n ± 0%   -1.53% (p=0.000 n=8)
Div64-4              132.7n ± 0%   117.3n ± 1%  -11.53% (p=0.000 n=8)
geomean              13.85n        9.917n       -28.41%

goos: linux
goarch: mips64le
pkg: crypto/sha256
                    │  oldsha256  │             newsha256              │
                    │   sec/op    │   sec/op     vs base               │
Hash8Bytes/New-4      6.689µ ± 0%   6.094µ ± 0%   -8.89% (p=0.000 n=8)
Hash8Bytes/Sum224-4   7.106µ ± 0%   6.507µ ± 0%   -8.43% (p=0.000 n=8)
Hash8Bytes/Sum256-4   7.217µ ± 0%   6.623µ ± 0%   -8.24% (p=0.000 n=8)
Hash1K/New-4          62.66µ ± 0%   52.35µ ± 0%  -16.45% (p=0.000 n=8)
Hash1K/Sum224-4       62.91µ ± 0%   52.75µ ± 0%  -16.16% (p=0.000 n=8)
Hash1K/Sum256-4       63.03µ ± 0%   52.86µ ± 0%  -16.14% (p=0.000 n=8)
Hash8K/New-4          450.8µ ± 0%   373.5µ ± 0%  -17.15% (p=0.000 n=8)
Hash8K/Sum224-4       451.0µ ± 0%   373.9µ ± 0%  -17.10% (p=0.000 n=8)
Hash8K/Sum256-4       451.5µ ± 0%   374.0µ ± 0%  -17.16% (p=0.000 n=8)
geomean               58.34µ        50.14µ       -14.05%

                    │  oldsha256   │              newsha256               │
                    │     B/s      │      B/s       vs base               │
Hash8Bytes/New-4      1.144Mi ± 1%   1.249Mi ±  0%   +9.17% (p=0.000 n=8)
Hash8Bytes/Sum224-4   1.078Mi ± 1%   1.173Mi ±  0%   +8.85% (p=0.000 n=8)
Hash8Bytes/Sum256-4   1.059Mi ± 1%   1.154Mi ±  0%   +9.01% (p=0.000 n=8)
Hash1K/New-4          15.58Mi ± 0%   18.65Mi ± 12%  +19.71% (p=0.000 n=8)
Hash1K/Sum224-4       15.53Mi ± 1%   18.51Mi ±  0%  +19.23% (p=0.000 n=8)
Hash1K/Sum256-4       15.49Mi ± 0%   18.47Mi ±  0%  +19.24% (p=0.000 n=8)
Hash8K/New-4          17.33Mi ± 0%   20.91Mi ±  0%  +20.69% (p=0.000 n=8)
Hash8K/Sum224-4       17.32Mi ± 0%   20.90Mi ±  0%  +20.65% (p=0.000 n=8)
Hash8K/Sum256-4       17.30Mi ± 0%   20.89Mi ±  0%  +20.73% (p=0.000 n=8)
geomean               6.649Mi        7.729Mi        +16.24%

[HeliC829]

cc @cherrymui

[randall77]

See my comment over at #59415 (comment)

[ianlancetaylor]

@randall77 I think that your comment has been addressed: the proposal here is permitting setting GOMIPS64 to direct the compiler to generate a few special purpose instructions.

@HeliC829 The GOMIPS64 variable already exists, of course. I think that you are suggesting that we permit a comma-separate list of options in GOMIPS64. The options can be

• either hardfloat (default) or softfloat
• one of r1 (default), r2, r3, r5, r6

I added r1 because there has to be a way to specify the default. I added the others because compilers support them. I don't know what happened to r4.

Do you have any reference to what the different ISA levels mean? I couldn't find one.

[HeliC829]

Do you have any reference to what the different ISA levels mean? I couldn't find one.

Here is MIPS ISA level ref, at Page 24 of 148 :
https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00083-2B-MIPS64INT-AFP-06.01.pdf

Golang currently support MIPS III on MIPS64, to be notice, MIPS III is different from MIPS R1. So we could consider 3 as the default level,

To resolve there is letter in ISA level, i think we can use the enum mips_isa level defined in gcc in rules.

[ianlancetaylor]

I know that the situation is very confusing, but it doesn't seem ideal to treat 3 as the default level while also permitting r1. Can we come up with a list of strings that makes sense today and also for the future?

[HeliC829]

OK, so let us use roman numerals iii mean default level MIPS III? And the value related to isa level are as follows:

iii: MIPS III (default, also current MIPS64 isa level)
r1:MIPS R1
r2:MIPS R2
r5:MIPS R5
r6:MIPS R6

[rsc]

From the doc linked above:

It sounds like GOMIPS64 is a comma-separated list of choices: hardfloat, softfloat, iii, r1, r2, r5, r6.
Probably we should define them all: iii, iv, v, r1, r2, r3, r5, r6. We may not use them today but they'll be defined.

Do I have that right?

[rsc]

This proposal has been added to the active column of the proposals project
and will now be reviewed at the weekly proposal review meetings.
— rsc for the proposal review group