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When allocting registers for live values, use desired register if available, this is helpful for some cases, such as (*entry).delete, which can save a few of copies. Besides, this patch allows more debugging information to be printed out. Test results of compilecmp on Linux/amd64: name old time/op new time/op delta Template 326729362.060000ns +- 3% 329227238.775510ns +- 4% +0.76% (p=0.038 n=50+49) Unicode 157671860.391304ns +- 6% 156917927.320000ns +- 6% ~ (p=0.291 n=46+50) GoTypes 1065591138.304348ns +- 2% 1063695977.434783ns +- 1% ~ (p=0.208 n=46+46) Compiler 5053424790.760001ns +- 2% 5052729636.551020ns +- 3% ~ (p=0.908 n=50+49) SSA 12392067635.866669ns +- 2% 12319786960.460005ns +- 2% -0.58% (p=0.008 n=45+50) Flate 212609767.340000ns +- 5% 213011228.085106ns +- 5% ~ (p=0.685 n=50+47) GoParser 266870495.100000ns +- 4% 266962314.280000ns +- 3% ~ (p=0.975 n=50+50) Reflect 660164306.551021ns +- 2% 658284470.729167ns +- 2% ~ (p=0.069 n=49+48) Tar 292805895.720000ns +- 4% 292103626.954545ns +- 2% ~ (p=0.321 n=50+44) XML 386294811.700000ns +- 4% 386665088.820000ns +- 4% ~ (p=0.786 n=50+50) LinkCompiler 548495788.659575ns +- 5% 549359489.102041ns +- 4% ~ (p=0.855 n=47+49) ExternalLinkCompiler 1810414270.280000ns +- 2% 1806872224.673470ns +- 2% ~ (p=0.313 n=50+49) LinkWithoutDebugCompiler 340888843.795918ns +- 5% 340341541.100000ns +- 6% ~ (p=0.735 n=49+50) [Geo mean] 664550174.613777ns 664090221.153575ns -0.07% name old user-time/op new user-time/op delta Template 565202800.000000ns +-16% 595351040.000000ns +-16% +5.33% (p=0.001 n=50+50) Unicode 378444740.000000ns +-14% 373825183.673469ns +-17% ~ (p=0.458 n=50+49) GoTypes 2052073341.463415ns +-12% 2059679864.864865ns +- 7% ~ (p=0.381 n=41+37) Compiler 9913371980.000000ns +-20% 9848836720.000002ns +-19% ~ (p=0.781 n=50+50) SSA 25013846224.489799ns +-17% 24571896183.673466ns +-17% ~ (p=0.132 n=49+49) Flate 314422702.127660ns +-17% 314831666.666667ns +-11% ~ (p=0.427 n=47+45) GoParser 419496060.000000ns +- 9% 417403460.000000ns +-11% ~ (p=0.512 n=50+50) Reflect 1233632469.387755ns +-17% 1193061073.170732ns +-13% -3.29% (p=0.030 n=49+41) Tar 509855937.500000ns +-10% 508700740.000000ns +-14% ~ (p=0.890 n=48+50) XML 703511425.531915ns +-12% 694007591.836735ns +-11% ~ (p=0.164 n=47+49) LinkCompiler 993137687.500000ns +- 6% 991914714.285714ns +- 8% ~ (p=0.860 n=48+49) ExternalLinkCompiler 2193851840.000001ns +- 3% 2186672183.673470ns +- 5% ~ (p=0.320 n=50+49) LinkWithoutDebugCompiler 420800875.000000ns +-10% 422062640.000000ns +- 9% ~ (p=0.840 n=48+50) [Geo mean] 1145156131.480097ns 1142033233.550961ns -0.27% name old alloc/op new alloc/op delta Template 36.3MB +- 0% 36.3MB +- 0% ~ (p=0.886 n=50+49) Unicode 30.1MB +- 0% 30.1MB +- 0% ~ (p=0.792 n=50+50) GoTypes 118MB +- 0% 118MB +- 0% ~ (p=1.000 n=47+48) Compiler 562MB +- 0% 562MB +- 0% ~ (p=0.205 n=50+49) SSA 1.42GB +- 0% 1.42GB +- 0% -0.12% (p=0.000 n=50+50) Flate 22.8MB +- 0% 22.8MB +- 0% ~ (p=0.384 n=50+47) GoParser 28.0MB +- 0% 28.0MB +- 0% -0.02% (p=0.013 n=50+50) Reflect 78.0MB +- 0% 78.0MB +- 0% ~ (p=0.384 n=46+48) Tar 34.1MB +- 0% 34.1MB +- 0% ~ (p=0.072 n=50+50) XML 43.1MB +- 0% 43.1MB +- 0% -0.04% (p=0.000 n=49+50) LinkCompiler 98.5MB +- 0% 98.5MB +- 0% +0.01% (p=0.012 n=50+43) ExternalLinkCompiler 89.6MB +- 0% 89.6MB +- 0% ~ (p=0.762 n=50+50) LinkWithoutDebugCompiler 56.9MB +- 0% 56.9MB +- 0% ~ (p=0.268 n=49+48) [Geo mean] 77.7MB 77.7MB -0.01% name old allocs/op new allocs/op delta Template 367k +- 0% 367k +- 0% -0.01% (p=0.002 n=50+49) Unicode 345k +- 0% 345k +- 0% ~ (p=0.981 n=50+50) GoTypes 1.28M +- 0% 1.28M +- 0% -0.00% (p=0.002 n=49+50) Compiler 5.39M +- 0% 5.39M +- 0% -0.00% (p=0.000 n=50+50) SSA 13.9M +- 0% 13.9M +- 0% +0.01% (p=0.000 n=50+50) Flate 230k +- 0% 230k +- 0% ~ (p=0.815 n=50+50) GoParser 292k +- 0% 292k +- 0% -0.01% (p=0.000 n=50+50) Reflect 977k +- 0% 977k +- 0% -0.00% (p=0.035 n=50+50) Tar 343k +- 0% 343k +- 0% -0.01% (p=0.008 n=48+50) XML 418k +- 0% 418k +- 0% -0.01% (p=0.000 n=50+50) LinkCompiler 516k +- 0% 516k +- 0% +0.01% (p=0.002 n=50+48) ExternalLinkCompiler 570k +- 0% 570k +- 0% ~ (p=0.430 n=46+50) LinkWithoutDebugCompiler 169k +- 0% 169k +- 0% ~ (p=0.706 n=49+49) [Geo mean] 672k 672k -0.00% name old maxRSS/op new maxRSS/op delta Template 34.3M +- 5% 34.7M +- 4% +1.24% (p=0.004 n=50+50) Unicode 36.2M +- 5% 36.1M +- 8% ~ (p=0.785 n=50+50) GoTypes 75.7M +- 7% 76.1M +- 6% ~ (p=0.544 n=50+50) Compiler 304M +- 7% 304M +- 7% ~ (p=0.744 n=50+50) SSA 721M +- 6% 723M +- 7% ~ (p=0.724 n=49+50) Flate 26.1M +- 3% 26.1M +- 5% ~ (p=0.649 n=48+49) GoParser 29.3M +- 5% 29.3M +- 4% ~ (p=0.809 n=50+50) Reflect 56.0M +- 6% 56.3M +- 5% ~ (p=0.350 n=50+50) Tar 34.1M +- 3% 33.9M +- 5% ~ (p=0.121 n=49+50) XML 39.6M +- 5% 39.9M +- 4% ~ (p=0.109 n=50+50) LinkCompiler 168M +- 1% 168M +- 1% ~ (p=0.578 n=49+48) ExternalLinkCompiler 179M +- 1% 179M +- 2% ~ (p=0.522 n=46+46) LinkWithoutDebugCompiler 137M +- 3% 137M +- 3% ~ (p=0.463 n=41+50) [Geo mean] 79.3M 79.5M +0.20% name old text-bytes new text-bytes delta HelloSize 812kB +- 0% 811kB +- 0% -0.05% (p=0.000 n=50+50) name old data-bytes new data-bytes delta HelloSize 13.3kB +- 0% 13.3kB +- 0% ~ (all equal) name old bss-bytes new bss-bytes delta HelloSize 206kB +- 0% 206kB +- 0% ~ (all equal) name old exe-bytes new exe-bytes delta HelloSize 1.21MB +- 0% 1.21MB +- 0% +0.02% (p=0.000 n=50+50) file before after Δ % addr2line 4052949 4052453 -496 -0.012% api 4948171 4947163 -1008 -0.020% asm 4888889 4888049 -840 -0.017% buildid 2617545 2617673 +128 +0.005% cgo 4521681 4516801 -4880 -0.108% compile 19139091 19137683 -1408 -0.007% cover 4843191 4840359 -2832 -0.058% dist 3473677 3474717 +1040 +0.030% doc 3821592 3821552 -40 -0.001% fix 3220587 3220059 -528 -0.016% link 6587368 6582696 -4672 -0.071% nm 3999858 3999186 -672 -0.017% objdump 4409161 4408217 -944 -0.021% pack 2394038 2393846 -192 -0.008% pprof 13601271 13602487 +1216 +0.009% test2json 2645148 2644604 -544 -0.021% trace 10357878 10356862 -1016 -0.010% vet 6779482 6778706 -776 -0.011% total 106301577 106283113 -18464 -0.017% Change-Id: I63ac6e224e1a4756ddc1bfc4aabbaeb92d7d4273 Reviewed-on: https://go-review.googlesource.com/c/go/+/263599 Run-TryBot: eric fang <eric.fang@arm.com> TryBot-Result: Go Bot <gobot@golang.org> Trust: eric fang <eric.fang@arm.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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