cmd/compile: use MOVBE instruction for GOAMD64>=v3
encoding/binary benchmark on my laptop:
name old time/op new time/op delta
ReadSlice1000Int32s-8 4.42µs ± 5% 4.20µs ± 1% -4.94% (p=0.046 n=9+8)
ReadStruct-8 359ns ± 8% 368ns ± 5% +2.35% (p=0.041 n=9+10)
WriteStruct-8 349ns ± 1% 357ns ± 1% +2.15% (p=0.000 n=8+10)
ReadInts-8 235ns ± 1% 233ns ± 1% -1.01% (p=0.005 n=10+10)
WriteInts-8 265ns ± 1% 274ns ± 1% +3.45% (p=0.000 n=10+10)
WriteSlice1000Int32s-8 4.61µs ± 5% 4.59µs ± 5% ~ (p=0.986 n=10+10)
PutUint16-8 0.56ns ± 4% 0.57ns ± 4% ~ (p=0.101 n=10+10)
PutUint32-8 0.83ns ± 2% 0.56ns ± 6% -32.91% (p=0.000 n=10+10)
PutUint64-8 0.81ns ± 3% 0.62ns ± 4% -23.82% (p=0.000 n=10+10)
LittleEndianPutUint16-8 0.55ns ± 4% 0.55ns ± 3% ~ (p=0.926 n=10+10)
LittleEndianPutUint32-8 0.41ns ± 4% 0.42ns ± 3% ~ (p=0.148 n=10+9)
LittleEndianPutUint64-8 0.55ns ± 2% 0.56ns ± 6% ~ (p=0.897 n=10+10)
ReadFloats-8 60.4ns ± 4% 59.0ns ± 1% -2.25% (p=0.007 n=10+10)
WriteFloats-8 72.3ns ± 2% 71.5ns ± 7% ~ (p=0.089 n=10+10)
ReadSlice1000Float32s-8 4.21µs ± 3% 4.18µs ± 2% ~ (p=0.197 n=10+10)
WriteSlice1000Float32s-8 4.61µs ± 2% 4.68µs ± 7% ~ (p=1.000 n=8+10)
ReadSlice1000Uint8s-8 250ns ± 4% 247ns ± 4% ~ (p=0.324 n=10+10)
WriteSlice1000Uint8s-8 227ns ± 5% 229ns ± 2% ~ (p=0.193 n=10+7)
PutUvarint32-8 15.3ns ± 2% 15.4ns ± 4% ~ (p=0.782 n=10+10)
PutUvarint64-8 38.5ns ± 1% 38.6ns ± 5% ~ (p=0.396 n=8+10)
name old speed new speed delta
ReadSlice1000Int32s-8 890MB/s ±17% 953MB/s ± 1% +7.00% (p=0.027 n=10+8)
ReadStruct-8 209MB/s ± 8% 204MB/s ± 5% -2.42% (p=0.043 n=9+10)
WriteStruct-8 214MB/s ± 3% 210MB/s ± 1% -1.75% (p=0.003 n=9+10)
ReadInts-8 127MB/s ± 1% 129MB/s ± 1% +1.01% (p=0.006 n=10+10)
WriteInts-8 113MB/s ± 1% 109MB/s ± 1% -3.34% (p=0.000 n=10+10)
WriteSlice1000Int32s-8 868MB/s ± 5% 872MB/s ± 5% ~ (p=1.000 n=10+10)
PutUint16-8 3.55GB/s ± 4% 3.50GB/s ± 4% ~ (p=0.093 n=10+10)
PutUint32-8 4.83GB/s ± 2% 7.21GB/s ± 6% +49.16% (p=0.000 n=10+10)
PutUint64-8 9.89GB/s ± 3% 12.99GB/s ± 4% +31.26% (p=0.000 n=10+10)
LittleEndianPutUint16-8 3.65GB/s ± 4% 3.65GB/s ± 4% ~ (p=0.912 n=10+10)
LittleEndianPutUint32-8 9.74GB/s ± 3% 9.63GB/s ± 3% ~ (p=0.222 n=9+9)
LittleEndianPutUint64-8 14.4GB/s ± 2% 14.3GB/s ± 5% ~ (p=0.912 n=10+10)
ReadFloats-8 199MB/s ± 4% 203MB/s ± 1% +2.27% (p=0.007 n=10+10)
WriteFloats-8 166MB/s ± 2% 168MB/s ± 7% ~ (p=0.089 n=10+10)
ReadSlice1000Float32s-8 949MB/s ± 3% 958MB/s ± 2% ~ (p=0.218 n=10+10)
WriteSlice1000Float32s-8 867MB/s ± 2% 857MB/s ± 6% ~ (p=1.000 n=8+10)
ReadSlice1000Uint8s-8 4.00GB/s ± 4% 4.06GB/s ± 4% ~ (p=0.353 n=10+10)
WriteSlice1000Uint8s-8 4.40GB/s ± 4% 4.36GB/s ± 2% ~ (p=0.193 n=10+7)
PutUvarint32-8 262MB/s ± 2% 260MB/s ± 4% ~ (p=0.739 n=10+10)
PutUvarint64-8 208MB/s ± 1% 207MB/s ± 5% ~ (p=0.408 n=8+10)
Updates #45453
Change-Id: Ifda0d48d54665cef45d46d3aad974062633142c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/354670
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>