merge revision(s) 66681,66682,66684,66688,66697,66751,66693,66694: [Backport #15491]

	complex.c: Optimize Complex#+ for some conditions

	Optimize f_add defined in complex.c for some specific conditions.
	It makes Complex#+ about 1.4x faster than r66678.

	Compared to r66678:

	```
	mrkn-mbp15-late2016:complex-optim-o3 mrkn$ make benchmark ITEM=complex_float_ COMPARE_RUBY=/Users/mrkn/.rbenv/versions/trunk-o3/bin/ruby
	/Users/mrkn/src/github.com/ruby/ruby/revision.h unchanged
	/Users/mrkn/.rbenv/shims/ruby --disable=gems -rrubygems -I/Users/mrkn/src/github.com/ruby/ruby/benchmark/lib /Users/mrkn/src/github.com/ruby/ruby/benchmark/benchmark-driver/exe/benchmark-driver \
	                    --executables="compare-ruby::/Users/mrkn/.rbenv/versions/trunk-o3/bin/ruby -I.ext/common --disable-gem" \
	                    --executables="built-ruby::./miniruby -I/Users/mrkn/src/github.com/ruby/ruby/lib -I. -I.ext/common  -r/Users/mrkn/src/github.com/ruby/ruby/prelude --disable-gem" \
	                    $(find /Users/mrkn/src/github.com/ruby/ruby/benchmark -maxdepth 1 -name '*complex_float_*.yml' -o -name '*complex_float_*.rb' | sort)
	Calculating -------------------------------------
	                     compare-ruby  built-ruby
	   complex_float_add       9.132M     12.864M i/s -      1.000M times in 0.109511s 0.077734s
	   complex_float_div     600.723k    627.878k i/s -      1.000M times in 1.664662s 1.592666s
	   complex_float_mul       2.320M      2.347M i/s -      1.000M times in 0.431039s 0.426113s
	   complex_float_new       1.473M      1.489M i/s -      1.000M times in 0.678791s 0.671750s
	 complex_float_power       1.690M      1.722M i/s -      1.000M times in 0.591863s 0.580775s
	   complex_float_sub       8.870M      9.516M i/s -      1.000M times in 0.112740s 0.105091s

	Comparison:
	                complex_float_add
	          built-ruby:  12864383.7 i/s
	        compare-ruby:   9131502.8 i/s - 1.41x  slower

	                complex_float_div
	          built-ruby:    627878.0 i/s
	        compare-ruby:    600722.5 i/s - 1.05x  slower

	                complex_float_mul
	          built-ruby:   2346795.3 i/s
	        compare-ruby:   2319975.7 i/s - 1.01x  slower

	                complex_float_new
	          built-ruby:   1488649.1 i/s
	        compare-ruby:   1473207.5 i/s - 1.01x  slower

	              complex_float_power
	          built-ruby:   1721837.2 i/s
	        compare-ruby:   1689580.2 i/s - 1.02x  slower

	                complex_float_sub
	          built-ruby:   9515562.7 i/s
	        compare-ruby:   8869966.3 i/s - 1.07x  slower
	```

	suppress warning: method redefined; discarding old + introduced at r66681

	complex.c: fix indentation

	complex.c: fix against redefining component methods

	This fixes the incompatibility (maybe unintentionally) introduced by
	removal of `#ifndef PRESERVE_SIGNEDZERO` guards in f_add, f_mul, and
	f_sub functions in r62701.  [Bug #15491] [ruby-core:90843]

	complex.c: Optimize Complex#* and Complex#**

	Optimize f_mul for the core numeric class components.
	This change improves the computation time of Complex#* and Complex#**.

	```
	$ make benchmark ITEM=complex_float_ COMPARE_RUBY=/Users/mrkn/.rbenv/versions/2.6.0/bin/ruby
	generating known_errors.inc
	known_errors.inc unchanged
	/Users/mrkn/src/github.com/ruby/ruby/revision.h unchanged
	/Users/mrkn/.rbenv/shims/ruby --disable=gems -rrubygems -I/Users/mrkn/src/github.com/ruby/ruby/benchmark/lib /Users/mrkn/src/github.com/ruby/ruby/benchmark/benchmark-driver/exe/benchmark-driver \
	                    --executables="compare-ruby::/Users/mrkn/.rbenv/versions/2.6.0/bin/ruby -I.ext/common --disable-gem" \
	                    --executables="built-ruby::./miniruby -I/Users/mrkn/src/github.com/ruby/ruby/lib -I. -I.ext/common  -r/Users/mrkn/src/github.com/ruby/ruby/prelude --disable-gem" \
	                    $(find /Users/mrkn/src/github.com/ruby/ruby/benchmark -maxdepth 1 -name '*complex_float_*.yml' -o -name '*complex_float_*.rb' | sort)
	Calculating -------------------------------------
	                     compare-ruby  built-ruby
	   complex_float_add       6.558M     13.012M i/s -      1.000M times in 0.152480s 0.076850s
	   complex_float_div     576.821k    567.969k i/s -      1.000M times in 1.733640s 1.760660s
	   complex_float_mul       1.690M      2.628M i/s -      1.000M times in 0.591786s 0.380579s
	   complex_float_new       1.350M      1.268M i/s -      1.000M times in 0.740669s 0.788762s
	 complex_float_power       1.571M      1.835M i/s -      1.000M times in 0.636507s 0.544909s
	   complex_float_sub       8.635M      8.779M i/s -      1.000M times in 0.115814s 0.113906s

	Comparison:
	                complex_float_add
	          built-ruby:  13012361.7 i/s
	        compare-ruby:   6558237.1 i/s - 1.98x  slower

	                complex_float_div
	        compare-ruby:    576821.0 i/s
	          built-ruby:    567968.8 i/s - 1.02x  slower

	                complex_float_mul
	          built-ruby:   2627575.4 i/s
	        compare-ruby:   1689800.0 i/s - 1.55x  slower

	                complex_float_new
	        compare-ruby:   1350130.8 i/s
	          built-ruby:   1267809.6 i/s - 1.06x  slower

	              complex_float_power
	          built-ruby:   1835168.8 i/s
	        compare-ruby:   1571074.6 i/s - 1.17x  slower

	                complex_float_sub
	          built-ruby:   8779168.8 i/s
	        compare-ruby:   8634534.7 i/s - 1.02x  slower
	```

	complex.c: replace misused UNLIKELY with LIKELY

	test_complex.rb: fix tests for RUBYOPT="-w"

	test_complex.rb: use the same approach to fix failures

	as r66682.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/version.h b/version.h
index 16a74518e8..3c581a4441 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.0"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 22
+#define RUBY_PATCHLEVEL 23
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 1