Keith Randall fb05948d9e cmd/compile,math: improve code generation for math.Abs ... Implement int reg <-> fp reg moves on amd64. If we see a load to int reg followed by an int->fp move, then we can just load to the fp reg instead. Same for stores. math.Abs is now: MOVQ "".x+8(SP), AX SHLQ $1, AX SHRQ $1, AX MOVQ AX, "".~r1+16(SP) math.Copysign is now: MOVQ "".x+8(SP), AX SHLQ $1, AX SHRQ $1, AX MOVQ "".y+16(SP), CX SHRQ $63, CX SHLQ $63, CX ORQ CX, AX MOVQ AX, "".~r2+24(SP) math.Float64bits is now: MOVSD "".x+8(SP), X0 MOVSD X0, "".~r1+16(SP) (it would be nicer to use a non-SSE reg for this, nothing is perfect) And due to the fix for #21440, the inlined version of these improve as well. name old time/op new time/op delta Abs 1.38ns ± 5% 0.89ns ±10% -35.54% (p=0.000 n=10+10) Copysign 1.56ns ± 7% 1.35ns ± 6% -13.77% (p=0.000 n=9+10) Fixes #13095 Change-Id: Ibd7f2792412a6668608780b0688a77062e1f1499 Reviewed-on: https://go-review.googlesource.com/58732 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>		2017-08-25 19:15:01 +00:00
..
archive	archive/tar: return better WriteHeader errors	2017-08-25 05:21:00 +00:00
bufio
builtin
bytes	bytes: add examples for TrimLeft and TrimRight	2017-08-22 21:31:54 +00:00
cmd	cmd/compile,math: improve code generation for math.Abs	2017-08-25 19:15:01 +00:00
compress
container
context
crypto	crypto/x509: skip TestSystemRoots	2017-08-22 19:54:08 +00:00
database/sql	all: fix easy-to-miss typos	2017-08-23 03:07:12 +00:00
debug	all: unindent some big chunks of code	2017-08-18 06:59:48 +00:00
encoding	encoding/gob: fix Debug to properly print uint	2017-08-25 10:22:07 +00:00
errors
expvar
flag
fmt	fmt: add Stringer example	2017-08-16 18:02:42 +00:00
go	go/doc: classify function returning slice of T as constructor	2017-08-22 08:09:42 +00:00
hash
html
image
index/suffixarray
internal	all: fix easy-to-miss typos	2017-08-23 03:07:12 +00:00
io	io: add example for Pipe	2017-08-22 19:42:20 +00:00
log
math	cmd/compile,math: improve code generation for math.Abs	2017-08-25 19:15:01 +00:00
mime
net	{net,os/user,plugin}: eliminate unnecessary C round-trips	2017-08-17 18:14:16 +00:00
os	{net,os/user,plugin}: eliminate unnecessary C round-trips	2017-08-17 18:14:16 +00:00
path	path/filepath: add example for Ext	2017-08-25 16:24:37 +00:00
plugin	{net,os/user,plugin}: eliminate unnecessary C round-trips	2017-08-17 18:14:16 +00:00
reflect	reflect: handle types with unexported methods before exported ones	2017-08-23 23:48:49 +00:00
regexp
runtime	runtime: capture runtimeInitTime after nanotime is initialized	2017-08-25 16:02:17 +00:00
sort	sort: fix TestAdversary	2017-08-25 05:58:57 +00:00
strconv	strconv: optimize Atoi for common case	2017-08-25 10:17:39 +00:00
strings
sync	sync/atomic: remove references to old atomic pointer hammer tests	2017-08-25 05:58:33 +00:00
syscall	syscall: skip some exec tests in container	2017-08-23 21:46:55 +00:00
testing	testing: parallelize tests over count	2017-08-24 05:45:17 +00:00
text	all: unindent some big chunks of code	2017-08-18 06:59:48 +00:00
time	time: fix grammar/spelling errors in test comment	2017-08-21 17:52:45 +00:00
unicode
unsafe
vendor/golang_org/x
all.bash
all.bat
all.rc
androidtest.bash
bootstrap.bash
buildall.bash
clean.bash
clean.bat
clean.rc
cmp.bash
iostest.bash
make.bash	build: add go env GOROOT as default GOROOT_BOOTSTRAP value	2017-08-25 05:36:27 +00:00
make.bat
Make.dist
make.rc	build: add go env GOROOT as default GOROOT_BOOTSTRAP value	2017-08-25 05:36:27 +00:00
naclmake.bash
nacltest.bash
race.bash
race.bat
run.bash
run.bat
run.rc