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5 Commits

Author SHA1 Message Date
Jakub Jelinek a554497024 Update copyright years. 
From-SVN: r267494
 2019-01-01 13:31:55 +01:00
Jonathan Wakely 2fb17d2d90 Avoid undefined shifts in ceil2 operations 
For values where the result cannot be represented the shift width would
be equal to the width of the type, which is undefined. Perform two
well-defined shifts instead of one possible undefined shift.

	* include/bits/hashtable_policy.h (__clp2): Fix calculation for LLP64
	targets where sizeof(size_t) > sizeof(long). Avoid undefined shifts
	of the number of bits in the type.
	* include/std/bit (__ceil2): Avoid undefined shifts.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Test values with
	the most signifiant bit set.

From-SVN: r263986
 2018-08-30 16:07:35 +01:00
Jonathan Wakely 25d4036370 Remove redundant { dg-do run } directives in tests 
These tests accidentally had two dg-do directives. Only the second one
is needed.

	* testsuite/26_numerics/bit/bitops.count/countl_one.cc: Remove
	redundant dg-do directive.
	* testsuite/26_numerics/bit/bitops.count/countl_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countr_one.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countr_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/popcount.cc: Likewise.

From-SVN: r263695
 2018-08-21 10:34:26 +01:00
Jonathan Wakely 90fc44ecfa Optimize std::rotl and std::rotr, add test for std::popcount 
* include/std/bit (__rotl, __rotr): Avoid branch.
	(_If_is_unsigned_integer): Use remove_cv_t.
	* testsuite/26_numerics/bit/bitops.count/popcount.cc: New.

From-SVN: r262378
 2018-07-04 09:07:23 +01:00
Jonathan Wakely f3e91052bd P0556R3 Integral power-of-2 operations, P0553R2 Bit operations 
P0553R2 is not in the C++2a working draft yet, but is likely to be
approved soon. Neither proposal supports std::byte but this adds
overloads of each function for std::byte, assuming that will also get
added.

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Include new header.
	* include/std/bit: New header.
	(__rotl, __rotr, __countl_zero, __countl_one, __countr_zero)
	(__countr_one, __popcount, __ispow2, __ceil2, __floor2, __log2p1):
	Define for C++14.
	[!__STRICT_ANSI__] (rotl, rotr, countl_zero, countl_one, countr_zero)
	(countr_one, popcount): Define for C++2a. Also overload for std::byte.
	(ispow2, ceil2, floor2, log2p1): Define for C++2a.
	[!__STRICT_ANSI__] (ispow2, ceil2, floor2, log2p1): Overload for
	std::byte.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: New.
	* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: New.
	* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: New.
	* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: New.
	* testsuite/26_numerics/bit/bitops.rot/rotl.cc: New.
	* testsuite/26_numerics/bit/bitops.rot/rotr.cc: New.
	* testsuite/26_numerics/bit/bitops.count/countl_one.cc: New.
	* testsuite/26_numerics/bit/bitops.count/countl_zero.cc: New.
	* testsuite/26_numerics/bit/bitops.count/countr_one.cc: New.
	* testsuite/26_numerics/bit/bitops.count/countr_zero.cc: New.

From-SVN: r262360
 2018-07-03 22:04:45 +01:00