https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105565
Bug ID: 105565
Summary: [11 Regression] constexpr function with bigger
integral cause internal compiler error
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: chenzhipeng02 at agora dot io
Target Milestone: ---
Created attachment 52954
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52954&action=edit
isPrimeConstexpr for 1073741789 compiled successfully but 2147483647 fail
The following code is bugInConstexpr.cpp in the Attachment
#include <iostream>
using LL = long long;
constexpr bool isPrimeR(LL n, LL c) {
return (c * c > n) ? true : (n % c == 0) ? false : isPrimeR(n, c + 2);
}
constexpr bool isPrimeConstexpr(LL n) {
return (n <= 1) ? false : n < 4 || (n % 2 == 1 && isPrimeR(n, 3));
}
int main() {
{
constexpr LL m = 1073741789LL; // prime
constexpr bool x = isPrimeConstexpr(m);
std::cout << m << " is " << (x ? "prime" : "not prime") << '\n';
}
// g++-11: internal compiler error: Segmentation fault: 11 signal terminated
program cc1plus
// {
// constexpr LL m = 44657LL * 44683LL; // 1995408731
// constexpr bool x = isPrimeConstexpr(m);
// std::cout << m << " is " << (x ? "prime" : "not prime") << '\n';
// }
// g++-11: internal compiler error: Segmentation fault: 11 signal terminated
program cc1plus
// {
// constexpr LL m = 2147483647LL; // prime 2^31 - 1
// constexpr bool x = isPrimeConstexpr(m);
// std::cout << m << " is " << (x ? "prime" : "not prime") << '\n';
// }
return 0;
}
It is used to check whether the constexpr number is prime or not.
$ g++-11 bugInConstexpr.cpp -std=c++17 -fconstexpr-depth=100000
will compile successfully, but if m changes to be 2147483647, it will compile
fail
with message
g++-11: internal compiler error: Segmentation fault: 11 signal terminated
program cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://github.com/Homebrew/homebrew-core/issues> for instructions.
!!! But Work fine in gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
$ g++-11 -v
Using built-in specs.
COLLECT_GCC=g++-11
COLLECT_LTO_WRAPPER=/opt/homebrew/Cellar/gcc/11.1.0_1/libexec/gcc/aarch64-apple-darwin20/11.1.0/lto-wrapper
Target: aarch64-apple-darwin20
Configured with: ../configure --prefix=/opt/homebrew/Cellar/gcc/11.1.0_1
--libdir=/opt/homebrew/Cellar/gcc/11.1.0_1/lib/gcc/11 --disable-nls
--enable-checking=release --enable-languages=c,c++,objc,obj-c++,fortran
--program-suffix=-11 --with-gmp=/opt/homebrew/opt/gmp
--with-mpfr=/opt/homebrew/opt/mpfr --with-mpc=/opt/homebrew/opt/libmpc
--with-isl=/opt/homebrew/opt/isl --with-zstd=/opt/homebrew/opt/zstd
--with-pkgversion='Homebrew GCC 11.1.0_1'
--with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--build=aarch64-apple-darwin20 --with-system-zlib --disable-multilib
--with-native-system-header-dir=/usr/include
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.1.0 (Homebrew GCC 11.1.0_1)
MacOS Monterey 12.3.1
---------------------------------------------------------------------------
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
9.4.0-1ubuntu1~20.04.1' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-gnu-unique-object --disable-vtable-verify --enable-plugin
--enable-default-pie --with-system-zlib --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-9-Av3uEd/gcc-9-9.4.0/debian/tmp-nvptx/usr,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
Ubuntu 22.04
