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big: use fast shift routines
Robert Griesemer authored 
- fixed a couple of bugs in the process
  (shift right was incorrect for negative numbers)
- added more tests and made some tests more robust
- changed pidigits back to using shifts to multiply
  by 2 instead of add

  This improves pidigit -s -n 10000 by approx. 5%:

  user 0m6.496s (old)
  user 0m6.156s (new)

R=rsc
CC=golang-dev
https://golang.org/cl/963044
58e77990
Name Last commit Last update
..
cmd 8g: bug272
lib9 rename GOOS=mingw to GOOS=windows
libbio Ports of lib9, libbio and libmach to Windows.
libcgo rename GOOS=mingw to GOOS=windows
libmach rename GOOS=mingw to GOOS=windows
pkg big: use fast shift routines
Make.386 makefile fixes; convert runtime to use new makefiles
Make.amd64 makefile fixes; convert runtime to use new makefiles
Make.arm makefile fixes; convert runtime to use new makefiles
Make.cmd Make.cmd: make 'all' the default target (was 'clean': BUG)
Make.common Factor the Makefiles to make writing outside Makefiles easier.
Make.conf Fix missing explicit GOBIN in src/pkg/Makefile. Clean up creation of
Make.pkg Add //export to cgo.
all-arm.bash arm: toss make-arm.bash
all-nacl.bash runtime: closures, defer bug fix for Native Client
all.bash build script tweaks
clean.bash add simple garbage collector benchmarks to dashboard
env.bash rename GOOS=mingw to GOOS=windows
make.bash build script tweaks
quietgcc.bash Build changes to support work on the BSDs.
run.bash run.bash: remove MAKEFLAGS=-j4 to prevent crashing on freebsd
sudo.bash go: makes it build for the case $GOROOT has whitespaces
version.bash version.bash: cope with ancient Mercurial
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