michel-leonard / c-quadratic-sieve Goto Github PK
View Code? Open in Web Editor NEWThe Quadratic Sieve algorithm for Integer Factorization up to 300+ bits in pure C.
The Quadratic Sieve algorithm for Integer Factorization up to 300+ bits in pure C.
quadratic_sieve: fac_quadratic.c:522: iteration_part_6: Assertion `R->mem == R->end' failed.
Hello,
I am very gratefull for this project and would like to support it (threading/GPU would be nice)...
Everything seem to work fine most of the time but on Linux WSL at least... i get some segfaults every now an then :
27. 705074515857134286120871238142845541623 = Segmentation fault
The number 705074515857134286120871238142845541623 gives error for me, I tried with -O1... same
I'll dig in a bit more with a debugger...
steps to reproduce:
$ gcc main.c -O3 -o qs
In file included from main.c:2:
In function ‘cint_erase’,
inlined from ‘cint_right_shifti’ at cint.c:286:9,
inlined from ‘cint_sqrt.part.0’ at cint.c:536:4:
cint.c:107:34: warning: ‘memset’ specified size between 9223372036854775808 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
107 | num->nat = 1, num->end = memset(num->mem, 0, (num->end - num->mem) * sizeof(h_cint_t));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘cint_right_shifti’,
inlined from ‘cint_sqrt.part.0’ at cint.c:536:4:
cint.c:278:31: note: destination object allocated here
278 | if (num->end - a > num->mem) {
| ~~~^~~~~
In function ‘cint_erase’,
inlined from ‘cint_right_shifti’ at cint.c:286:9,
inlined from ‘cint_sqrt.part.0’ at cint.c:539:4:
cint.c:107:34: warning: ‘memset’ specified size between 9223372036854775808 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
107 | num->nat = 1, num->end = memset(num->mem, 0, (num->end - num->mem) * sizeof(h_cint_t));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘cint_right_shifti’,
inlined from ‘cint_sqrt.part.0’ at cint.c:539:4:
cint.c:278:31: note: destination object allocated here
278 | if (num->end - a > num->mem) {
| ~~~^~~~~
Version of gcc:
gcc (Debian 12.2.0-14) 12.2.0
The program appears to function normally despite the warnings, and valgrind doesn't detect any memory leaks. The warning doesn't appear with -O2
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