cmd/compile: optimize math.Float64(32)bits and math.Float64(32)frombits on mips64x

cmd/compile: optimize math.Float64(32)bits and math.Float64(32)frombits on mips64x

This CL use MFC1/MTC1 instructions to move data between GPR and FPR instead of stores and loads to move float/int values.

goos: linux
goarch: mips64le
pkg: math
                      │   oldmath    │              newmath               │
                      │    sec/op    │   sec/op     vs base               │
Acos-4                   258.2n ± 0%   258.2n ± 0%        ~ (p=0.859 n=8)
Acosh-4                  378.7n ± 0%   323.9n ± 0%  -14.47% (p=0.000 n=8)
Asin-4                   255.1n ± 2%   255.5n ± 0%   +0.16% (p=0.002 n=8)
Asinh-4                  407.1n ± 0%   348.7n ± 0%  -14.35% (p=0.000 n=8)
Atan-4                   189.5n ± 0%   189.9n ± 3%        ~ (p=0.205 n=8)
Atanh-4                  355.6n ± 0%   323.4n ± 2%   -9.03% (p=0.000 n=8)
Atan2-4                  284.1n ± 7%   280.1n ± 4%        ~ (p=0.313 n=8)
Cbrt-4                   314.3n ± 0%   236.4n ± 0%  -24.79% (p=0.000 n=8)
Ceil-4                   144.3n ± 3%   139.6n ± 0%        ~ (p=0.069 n=8)
Compare-4               21.100n ± 0%   7.035n ± 0%  -66.66% (p=0.000 n=8)
Compare32-4             20.100n ± 0%   6.030n ± 0%  -70.00% (p=0.000 n=8)
Copysign-4              34.970n ± 0%   6.221n ± 0%  -82.21% (p=0.000 n=8)
Cos-4                    183.4n ± 3%   184.1n ± 5%        ~ (p=0.159 n=8)
Cosh-4                   487.9n ± 2%   419.6n ± 0%  -14.00% (p=0.000 n=8)
Erf-4                    160.6n ± 0%   157.9n ± 0%   -1.68% (p=0.009 n=8)
Erfc-4                   183.7n ± 4%   169.8n ± 0%   -7.54% (p=0.000 n=8)
Erfinv-4                 191.5n ± 4%   183.6n ± 0%   -4.13% (p=0.023 n=8)
Erfcinv-4                192.0n ± 7%   184.3n ± 0%        ~ (p=0.425 n=8)
Exp-4                    398.2n ± 0%   340.1n ± 4%  -14.58% (p=0.000 n=8)
ExpGo-4                  383.3n ± 0%   327.3n ± 0%  -14.62% (p=0.000 n=8)
Expm1-4                  248.7n ± 5%   216.0n ± 0%  -13.11% (p=0.000 n=8)
Exp2-4                   372.8n ± 0%   316.9n ± 3%  -14.98% (p=0.000 n=8)
Exp2Go-4                 374.1n ± 0%   320.5n ± 0%  -14.33% (p=0.000 n=8)
Abs-4                    3.013n ± 0%   3.016n ± 0%   +0.10% (p=0.020 n=8)
Dim-4                    5.021n ± 0%   5.022n ± 0%        ~ (p=0.270 n=8)
Floor-4                  127.5n ± 4%   126.2n ± 3%        ~ (p=0.186 n=8)
Max-4                    72.32n ± 0%   61.33n ± 0%  -15.20% (p=0.000 n=8)
Min-4                    83.33n ± 1%   61.36n ± 0%  -26.37% (p=0.000 n=8)
Mod-4                    690.7n ± 0%   454.5n ± 0%  -34.20% (p=0.000 n=8)
Frexp-4                 116.30n ± 1%   71.80n ± 1%  -38.26% (p=0.000 n=8)
Gamma-4                  389.0n ± 0%   355.9n ± 1%   -8.48% (p=0.000 n=8)
Hypot-4                 102.40n ± 0%   83.90n ± 0%  -18.07% (p=0.000 n=8)
HypotGo-4               105.45n ± 4%   84.82n ± 2%  -19.56% (p=0.000 n=8)
Ilogb-4                  99.13n ± 4%   63.71n ± 2%  -35.73% (p=0.000 n=8)
J0-4                     859.7n ± 0%   854.8n ± 0%   -0.57% (p=0.000 n=8)
J1-4                     873.9n ± 0%   875.7n ± 0%   +0.21% (p=0.007 n=8)
Jn-4                     1.855µ ± 0%   1.867µ ± 0%   +0.65% (p=0.000 n=8)
Ldexp-4                 130.50n ± 2%   64.35n ± 0%  -50.69% (p=0.000 n=8)
Lgamma-4                 208.8n ± 0%   200.9n ± 0%   -3.78% (p=0.000 n=8)
Log-4                    294.1n ± 0%   255.2n ± 3%  -13.22% (p=0.000 n=8)
Logb-4                  105.45n ± 1%   66.81n ± 1%  -36.64% (p=0.000 n=8)
Log1p-4                  268.2n ± 0%   211.3n ± 0%  -21.21% (p=0.000 n=8)
Log10-4                  295.4n ± 0%   255.2n ± 2%  -13.59% (p=0.000 n=8)
Log2-4                   152.9n ± 1%   127.5n ± 0%  -16.61% (p=0.000 n=8)
Modf-4                  103.40n ± 0%   75.36n ± 0%  -27.12% (p=0.000 n=8)
Nextafter32-4           121.20n ± 1%   78.40n ± 0%  -35.31% (p=0.000 n=8)
Nextafter64-4           110.40n ± 1%   64.91n ± 0%  -41.20% (p=0.000 n=8)
PowInt-4                 509.8n ± 1%   369.3n ± 1%  -27.56% (p=0.000 n=8)
PowFrac-4               1189.0n ± 0%   947.8n ± 0%  -20.29% (p=0.000 n=8)
Pow10Pos-4               15.07n ± 0%   15.07n ± 0%        ~ (p=0.733 n=8)
Pow10Neg-4               20.10n ± 0%   20.10n ± 0%        ~ (p=0.576 n=8)
Round-4                  44.22n ± 0%   26.12n ± 0%  -40.92% (p=0.000 n=8)
RoundToEven-4            46.22n ± 0%   27.12n ± 0%  -41.31% (p=0.000 n=8)
Remainder-4              539.0n ± 1%   417.1n ± 1%  -22.62% (p=0.000 n=8)
Signbit-4               17.985n ± 0%   5.694n ± 0%  -68.34% (p=0.000 n=8)
Sin-4                    185.7n ± 5%   172.9n ± 0%   -6.89% (p=0.001 n=8)
Sincos-4                 176.6n ± 0%   200.9n ± 0%  +13.76% (p=0.000 n=8)
Sinh-4                   495.8n ± 0%   435.9n ± 0%  -12.09% (p=0.000 n=8)
SqrtIndirect-4           5.022n ± 0%   5.024n ± 0%        ~ (p=0.083 n=8)
SqrtLatency-4            8.038n ± 0%   8.044n ± 0%        ~ (p=0.524 n=8)
SqrtIndirectLatency-4    8.035n ± 0%   8.039n ± 0%   +0.06% (p=0.017 n=8)
SqrtGoLatency-4          340.1n ± 0%   278.3n ± 0%  -18.19% (p=0.000 n=8)
SqrtPrime-4              5.381µ ± 0%   5.386µ ± 0%        ~ (p=0.662 n=8)
Tan-4                    198.6n ± 1%   183.1n ± 0%   -7.85% (p=0.000 n=8)
Tanh-4                   491.3n ± 1%   440.8n ± 1%  -10.29% (p=0.000 n=8)
Trunc-4                  121.7n ± 0%   121.7n ± 0%        ~ (p=0.769 n=8)
Y0-4                     855.1n ± 0%   859.8n ± 0%   +0.54% (p=0.007 n=8)
Y1-4                     862.3n ± 0%   865.1n ± 0%   +0.32% (p=0.007 n=8)
Yn-4                     1.830µ ± 0%   1.837µ ± 0%   +0.36% (p=0.011 n=8)
Float64bits-4           13.060n ± 0%   3.016n ± 0%  -76.91% (p=0.000 n=8)
Float64frombits-4       13.060n ± 0%   3.018n ± 0%  -76.90% (p=0.000 n=8)
Float32bits-4           13.060n ± 0%   3.016n ± 0%  -76.91% (p=0.000 n=8)
Float32frombits-4       13.070n ± 0%   3.013n ± 0%  -76.94% (p=0.000 n=8)
FMA-4                    446.0n ± 0%   413.1n ± 1%   -7.38% (p=0.000 n=8)
geomean                  143.4n        108.3n       -24.49%

Change-Id: I2067f7a5ae1126ada7ab3fb2083710e8212535e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/493815
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>