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desc
@@


1.1
log
@Initial revision
@
text
@! Copyright (C) 2018-2019 Free Software Foundation, Inc.
! Contributed by Steven G. Kargl <kargl@@gcc.gnu.org>
! 
! This file is part of the GNU Fortran runtime library (libgfortran).
! 
! Libgfortran is free software; you can redistribute it and/or
! modify it under the terms of the GNU General Public
! License as published by the Free Software Foundation; either
! version 3 of the License, or (at your option) any later version.
! 
! Libgfortran is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
! GNU General Public License for more details.
! 
! Under Section 7 of GPL version 3, you are granted additional
! permissions described in the GCC Runtime Library Exception, version
! 3.1, as published by the Free Software Foundation.
! 
! You should have received a copy of the GNU General Public License and
! a copy of the GCC Runtime Library Exception along with this program;
! see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
! <http://www.gnu.org/licenses/>.
!
!
! WARNING:  This file should never be compiled with an option that changes
! default logical kind from 4 to some other value or changes default integer
! kind from from 4 to some other value.
!
!
! There are four combinations of repeatable and image_distinct.  If a program
! is compiled without the -fcoarray= option or with -fcoarray=single, then
! execution of the compiled executable does not use image_distinct as it is
! irrelevant (although required).  The behavior is as follows:
!
! call random_init(.true., .true.)
!
! The sequence of random numbers is repeatable within an instance of program
! execution.  That is, calls to random_init(.true., .true.) during the
! execution will reset the sequence of RN to the same sequence.  If the
! program is compiled with -fcoarray=lib and multiple images are instantiated,
! then each image accesses a repeatable distinct sequence of random numbers.
! There are no guarantees that multiple execution of the program will access
! the same sequence.
!
! call random_init(.false., .false.)
! call random_init(.false., .true.)
!
! The sequence of random numbers is determined from process-dependent seeds.
! On each execution of the executable, different seeds will be used.  For
! -fcoarray=lib and multiple instantiated images, each image will use
! process-dependent seeds.  In other words, the two calls have identical
! behavior.
!
! call random_init(.true., .false.)
! 
! For a program compiled without the -fcoarray= option or with
! -fcoarray=single, a single image is instantiated when the executable is
! run.  If the executable causes multiple images to be instantiated, then
! image_distinct=.false. in one image cannot affect the sequence of random
! numbers in another image.  As gfortran gives each image its own independent
! PRNG, this condition is automatically satisfied.
!
impure subroutine _gfortran_random_init(repeatable, image_distinct, hidden) 

   implicit none

   logical, value, intent(in) :: repeatable
   logical, value, intent(in) :: image_distinct
   integer, value, intent(in) :: hidden

   logical, save :: once = .true.
   integer :: nseed
   integer, save, allocatable :: seed(:)

   if (once) then
      once = .false.
      call random_seed(size=nseed)
      allocate(seed(nseed))
      call random_seed(get=seed)
      !
      ! To guarantee that seed is distinct on multiple images, add the hidden
      ! argument (which is the image index).
      !
      if (image_distinct) seed = seed + hidden
   end if

   if (repeatable) then
      call random_seed(put=seed);
   else
      call random_seed();
   end if

end subroutine _gfortran_random_init
@


1.1.1.1
log
@initial import of GCC 9.3.0.  changes include:

- live patching support
- shell completion help
- generally better diagnostic output (less verbose/more useful)
- diagnostics and optimisation choices can be emitted in json
- asan memory usage reduction
- many general, and specific to switch, inter-procedure,
  profile and link-time optimisations.  from the release notes:
  "Overall compile time of Firefox 66 and LibreOffice 6.2.3 on
  an 8-core machine was reduced by about 5% compared to GCC 8.3"
- OpenMP 5.0 support
- better spell-guesser
- partial experimental support for c2x and c++2a
- c++17 is no longer experimental
- arm AAPCS GCC 6-8 structure passing bug fixed, may cause
  incompatibility (restored compat with GCC 5 and earlier.)
- openrisc support
@
text
@@


1.1.1.2
log
@initial import of GCC 10.3.0.  main changes include:

caveats:
- ABI issue between c++14 and c++17 fixed
- profile mode is removed from libstdc++
- -fno-common is now the default

new features:
- new flags -fallocation-dce, -fprofile-partial-training,
  -fprofile-reproducible, -fprofile-prefix-path, and -fanalyzer
- many new compile and link time optimisations
- enhanced drive optimisations
- openacc 2.6 support
- openmp 5.0 features
- new warnings: -Wstring-compare and -Wzero-length-bounds
- extended warnings: -Warray-bounds, -Wformat-overflow,
  -Wrestrict, -Wreturn-local-addr, -Wstringop-overflow,
  -Warith-conversion, -Wmismatched-tags, and -Wredundant-tags
- some likely C2X features implemented
- more C++20 implemented
- many new arm & intel CPUs known

hundreds of reported bugs are fixed.  full list of changes
can be found at:

   https://gcc.gnu.org/gcc-10/changes.html
@
text
@d1 1
a1 1
! Copyright (C) 2018-2020 Free Software Foundation, Inc.
@


1.1.1.3
log
@initial import of GCC 12.3.0.

major changes in GCC 11 included:

- The default mode for C++ is now -std=gnu++17 instead of -std=gnu++14.
- When building GCC itself, the host compiler must now support C++11,
  rather than C++98.
- Some short options of the gcov tool have been renamed: -i to -j and
  -j to -H.
- ThreadSanitizer improvements.
- Introduce Hardware-assisted AddressSanitizer support.
- For targets that produce DWARF debugging information GCC now defaults
  to DWARF version 5. This can produce up to 25% more compact debug
  information compared to earlier versions.
- Many optimisations.
- The existing malloc attribute has been extended so that it can be
  used to identify allocator/deallocator API pairs. A pair of new
  -Wmismatched-dealloc and -Wmismatched-new-delete warnings are added.
- Other new warnings:
  -Wsizeof-array-div, enabled by -Wall, warns about divisions of two
    sizeof operators when the first one is applied to an array and the
    divisor does not equal the size of the array element.
  -Wstringop-overread, enabled by default, warns about calls to string
    functions reading past the end of the arrays passed to them as
    arguments.
  -Wtsan, enabled by default, warns about unsupported features in
    ThreadSanitizer (currently std::atomic_thread_fence).
- Enchanced warnings:
  -Wfree-nonheap-object detects many more instances of calls to
    deallocation functions with pointers not returned from a dynamic
    memory allocation function.
  -Wmaybe-uninitialized diagnoses passing pointers or references to
    uninitialized memory to functions taking const-qualified arguments.
  -Wuninitialized detects reads from uninitialized dynamically
    allocated memory.
  -Warray-parameter warns about functions with inconsistent array forms.
  -Wvla-parameter warns about functions with inconsistent VLA forms.
- Several new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++20 features have been implemented.
- The C++ front end has experimental support for some of the upcoming
  C++23 draft.
- Several new C++ warnings.
- Enhanced Arm, AArch64, x86, and RISC-V CPU support.
- The implementation of how program state is tracked within
  -fanalyzer has been completely rewritten with many enhancements.

see https://gcc.gnu.org/gcc-11/changes.html for a full list.

major changes in GCC 12 include:

- An ABI incompatibility between C and C++ when passing or returning
  by value certain aggregates containing zero width bit-fields has
  been discovered on various targets. x86-64, ARM and AArch64
  will always ignore them (so there is a C ABI incompatibility
  between GCC 11 and earlier with GCC 12 or later), PowerPC64 ELFv2
  always take them into account (so there is a C++ ABI
  incompatibility, GCC 4.4 and earlier compatible with GCC 12 or
  later, incompatible with GCC 4.5 through GCC 11). RISC-V has
  changed the handling of these already starting with GCC 10. As
  the ABI requires, MIPS takes them into account handling function
  return values so there is a C++ ABI incompatibility with GCC 4.5
  through 11.
- STABS: Support for emitting the STABS debugging format is
  deprecated and will be removed in the next release. All ports now
  default to emit DWARF (version 2 or later) debugging info or are
  obsoleted.
- Vectorization is enabled at -O2 which is now equivalent to the
  original -O2 -ftree-vectorize -fvect-cost-model=very-cheap.
- GCC now supports the ShadowCallStack sanitizer.
- Support for __builtin_shufflevector compatible with the clang
  language extension was added.
- Support for attribute unavailable was added.
- Support for __builtin_dynamic_object_size compatible with the
  clang language extension was added.
- New warnings:
  -Wbidi-chars warns about potentially misleading UTF-8
    bidirectional control characters.
  -Warray-compare warns about comparisons between two operands of
    array type.
- Some new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++23 features have been implemented.
- Many C++ enhancements across warnings and -f options.

see https://gcc.gnu.org/gcc-12/changes.html for a full list.
@
text
@d1 1
a1 1
! Copyright (C) 2018-2022 Free Software Foundation, Inc.
d3 1
a3 1
!
d5 1
a5 1
!
d10 1
a10 1
!
d15 1
a15 1
!
d19 1
a19 1
!
d25 1
d28 1
a28 1
! kind from 4 to some other value.
a29 2
! There are four combinations of repeatable and image_distinct.  The
! language below is from the F2018 standard (actually, J3/18-007r1).
d31 32
a62 10
! This routine is only used for non-coarray programs or with programs
! compiled with -fcoarray=single.  Use of -fcoarray=lib or -fcoarray=shared
! requires different routines due to the need for communication between
! images under case(iv).
!
! Technically, neither image_distinct nor image_num are now needed.  The
! interface to _gfortran_random_init() is maintained for libgfortran ABI.
! Note, the Fortran standard requires the image_distinct argument, so
! it will always have a valid value, and the frontend generates an value
! of 0 for image_num.
d64 1
a64 1
impure subroutine _gfortran_random_init(repeatable, image_distinct, image_num) 
d70 1
a70 1
   integer, value, intent(in) :: image_num
d73 1
a73 1
   integer :: nseed, lcg_seed
d76 5
a80 11
   if (repeatable) then
      if (once) then
         once = .false.
         call random_seed(size=nseed)
         allocate(seed(nseed))
         lcg_seed = 57911963
         call _gfortran_lcg(seed)
      end if
      call random_seed(put=seed)
   else
      call random_seed()
d82 2
a83 2
      ! This cannot happen; but, prevent gfortran complaining about
      ! unused variables.
d85 1
a85 8
      if (image_num > 2) then
         block
            use iso_fortran_env, only : error_unit
            write(error_unit, '(A)') 'whoops: random_init(.false., .false.)'
            if (image_distinct) error stop image_num + 1
            error stop image_num
         end block
      end if
d88 5
a92 19
   contains
      !
      ! SK Park and KW Miller, ``Random number generators: good ones are hard
      ! to find,'' Comm. ACM, 31(10), 1192--1201, (1988).
      !
      ! Implementation of a prime modulus multiplicative linear congruential
      ! generator, which avoids overflow and provides the full period.
      !
      impure elemental subroutine _gfortran_lcg(i)
         implicit none
         integer, intent(out) :: i
         integer, parameter :: a = 16807     ! Multiplier
         integer, parameter :: m = huge(a)   ! Modulus
         integer, parameter :: q = 127773    ! Quotient to avoid overflow
         integer, parameter :: r = 2836      ! Remainder to avoid overflow
         lcg_seed = a * mod(lcg_seed, q) - r * (lcg_seed / q)
         if (lcg_seed <= 0) lcg_seed = lcg_seed + m
         i = lcg_seed
      end subroutine _gfortran_lcg
@


1.1.1.4
log
@initial import of GCC 14.3.0.

major changes in GCC 13:
- improved sanitizer
- zstd debug info compression
- LTO improvements
- SARIF based diagnostic support
- new warnings: -Wxor-used-as-pow, -Wenum-int-mismatch, -Wself-move,
  -Wdangling-reference
- many new -Wanalyzer* specific warnings
- enhanced warnings: -Wpessimizing-move, -Wredundant-move
- new attributes to mark file descriptors, c++23 "assume"
- several C23 features added
- several C++23 features added
- many new features for Arm, x86, RISC-V

major changes in GCC 14:
- more strict C99 or newer support
- ia64* marked deprecated (but seemingly still in GCC 15.)
- several new hardening features
- support for "hardbool", which can have user supplied values of true/false
- explicit support for stack scrubbing upon function exit
- better auto-vectorisation support
- added clang-compatible __has_feature and __has_extension
- more C23, including -std=c23
- several C++26 features added
- better diagnostics in C++ templates
- new warnings: -Wnrvo, Welaborated-enum-base
- many new features for Arm, x86, RISC-V
- possible ABI breaking change for SPARC64 and small structures with arrays
  of floats.
@
text
@d1 1
a1 1
! Copyright (C) 2018-2024 Free Software Foundation, Inc.
@