tree bc93f4180b5e63487d4989ff3ca7f4563d004775
parent 74d4af66e4183b0dc0293e998d117469136a817a
author Nigel Tao <nigeltao@golang.org> 1594345732 +1000
committer Nigel Tao <nigeltao@golang.org> 1594347086 +1000

Optimize 128-bit muls in parse_number_f64_eisel

Processing citylots.json from github.com/zemirco/sf-city-lots-json
$ cc -O3 script/process-json-numbers.c
$ time ./a.out --parse-number-f64 < citylots.json

gcc   9.3 Before/After
real    0m0.638s
real    0m0.609s

clang 9.0 Before/After
real    0m0.692s
real    0m0.685s

x86_64 Broadwell desktop CPU.