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Rémy Oudompheng authored
Apart from reducing the number of LEAL/LEAQ instructions by about 30%, it gives 8g easier registerization in several cases, for example in strconv. Performance with 6g is not affected. Before (386): src/pkg/strconv/decimal.go:22 TEXT (*decimal).String+0(SB),$240-12 src/pkg/strconv/extfloat.go:540 TEXT (*extFloat).ShortestDecimal+0(SB),$584-20 After (386): src/pkg/strconv/decimal.go:22 TEXT (*decimal).String+0(SB),$196-12 src/pkg/strconv/extfloat.go:540 TEXT (*extFloat).ShortestDecimal+0(SB),$420-20 Benchmarks with GOARCH=386 (on a Core 2). benchmark old ns/op new ns/op delta BenchmarkBinaryTree17 7110191000 7079644000 -0.43% BenchmarkFannkuch11 7769274000 7766514000 -0.04% BenchmarkGobDecode 33454820 34755400 +3.89% BenchmarkGobEncode 11675710 11007050 -5.73% BenchmarkGzip 2013519000 1593855000 -20.84% BenchmarkGunzip 253368200 242667600 -4.22% BenchmarkJSONEncode 152443900 120763400 -20.78% BenchmarkJSONDecode 304112800 247461800 -18.63% BenchmarkMandelbrot200 29245520 29240490 -0.02% BenchmarkParse 8484105 8088660 -4.66% BenchmarkRevcomp 2695688000 2841263000 +5.40% BenchmarkTemplate 363759800 277271200 -23.78% benchmark old ns/op new ns/op delta BenchmarkAtof64Decimal 127 129 +1.57% BenchmarkAtof64Float 166 164 -1.20% BenchmarkAtof64FloatExp 308 300 -2.60% BenchmarkAtof64Big 584 571 -2.23% BenchmarkAppendFloatDecimal 440 430 -2.27% BenchmarkAppendFloat 995 776 -22.01% BenchmarkAppendFloatExp 897 746 -16.83% BenchmarkAppendFloatNegExp 900 752 -16.44% BenchmarkAppendFloatBig 1528 1228 -19.63% BenchmarkAppendFloat32Integer 443 453 +2.26% BenchmarkAppendFloat32ExactFraction 812 661 -18.60% BenchmarkAppendFloat32Point 1002 773 -22.85% BenchmarkAppendFloat32Exp 858 725 -15.50% BenchmarkAppendFloat32NegExp 848 728 -14.15% BenchmarkAppendFloat64Fixed1 447 431 -3.58% BenchmarkAppendFloat64Fixed2 480 462 -3.75% BenchmarkAppendFloat64Fixed3 461 457 -0.87% BenchmarkAppendFloat64Fixed4 509 484 -4.91% Update #1914. R=rsc, nigeltao CC=golang-dev, remy https://golang.org/cl/6494107
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