Re: Compiling for ARMv8-A Using GCC 7.2.0 - Assertion error in gen-fac
Ciao, Il Ven, 6 Dicembre 2019 3:55 pm, Torbjörn Granlund ha scritto: > ni...@lysator.liu.se (Niels Möller) writes: > > > From my understanding this might be a difference in how GCC 7.2.0 > > handles unsigned longs vs GCC 4.8.5. > > Can you file a gcc bug? These constants are defined as > The first thing to try might be gcc 7.4, which was the final gcc 7 > release. There is also a 7.5 version, released Nov 14, 2019: https://gcc.gnu.org/gcc-7/ Ĝis, m -- http://bodrato.it/papers/ ___ gmp-bugs mailing list gmp-bugs@gmplib.org https://gmplib.org/mailman/listinfo/gmp-bugs
RE: Compiling for ARMv8-A Using GCC 7.2.0 - Assertion error in gen-fac
I also see no reasonable way for it to end up as 1. If I printf("%lu") those same two variables the results are even more strange: == GCC 4.8.5 == GMP_HLIMB_BIT=4294967296=1 GMP_LLIMB_MASK=4294967295= == GCC 7.2.0 == GMP_HLIMB_BIT=4294967296=1 GMP_LLIMB_MASK=4294967297=10001 So it appears like the "-1" being applies to GMP_HLIMB_BIT is a +1 in GCC 7.2.0. I've not encountered behaviour like this before. Very strange. I am currently investigating if this is an issue with how GCC handles longs between 4.8.5 and 7.2.0 in ARM64 hosts builds. This concludes me to believe a bug in GCC ARM64 or a bug in GMP or I am somehow building GCC wrong but right enough that it can compile most other libraries. I do notice in GCC 4.8.5 -mabi is not specified when compiling GMP. When GCC 7.2.0 goes to build GMP it is being explicit about the -mabi=lp64. If anything comes to mind let me know. I'll post back here if I find out the cause. Thanks, Stephen Damm -Original Message- From: Niels Möller [mailto:ni...@lysator.liu.se] Sent: December 6, 2019 03:51 To: Damm, Stephen Cc: gmp-bugs@gmplib.org Subject: Re: Compiling for ARMv8-A Using GCC 7.2.0 - Assertion error in gen-fac "Damm, Stephen" writes: > I was able to narrow down the cause. In GC 7.2.0 the GMP_LLIMB_MASK is wrong: > > =GCC 4.8.5= > GMP_LIMB_BITS=64 > GMP_LLIMB_MASK=4294967295=0x > > =GCC 7.2.0= > GMP_LIMB_BITS=64 > GMP_LLIMB_MASK=1=0x0001 > > From my understanding this might be a difference in how GCC 7.2.0 handles > unsigned longs vs GCC 4.8.5. It also could be I am missing some vital > compiler flag for GMP. Can you file a gcc bug? These constants are defined as #define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)/* 64, you say */ #define GMP_HLIMB_BIT ((mp_limb_t) 1 << (GMP_LIMB_BITS / 2)) #define GMP_LLIMB_MASK (GMP_HLIMB_BIT - 1) I see no reasonable way that can end up defining GMP_LLIMB_MASK as 1. Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677. Internet email is subject to wholesale government surveillance. ___ gmp-bugs mailing list gmp-bugs@gmplib.org https://gmplib.org/mailman/listinfo/gmp-bugs
Re: Compiling for ARMv8-A Using GCC 7.2.0 - Assertion error in gen-fac
ni...@lysator.liu.se (Niels Möller) writes: > I was able to narrow down the cause. In GC 7.2.0 the GMP_LLIMB_MASK is wrong: > > =GCC 4.8.5= > GMP_LIMB_BITS=64 > GMP_LLIMB_MASK=4294967295=0x > > =GCC 7.2.0= > GMP_LIMB_BITS=64 > GMP_LLIMB_MASK=1=0x0001 > > From my understanding this might be a difference in how GCC 7.2.0 > handles unsigned longs vs GCC 4.8.5. It also could be I am missing > some vital compiler flag for GMP. Can you file a gcc bug? These constants are defined as #define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)/* 64, you say */ #define GMP_HLIMB_BIT ((mp_limb_t) 1 << (GMP_LIMB_BITS / 2)) #define GMP_LLIMB_MASK (GMP_HLIMB_BIT - 1) I see no reasonable way that can end up defining GMP_LLIMB_MASK as 1. The first thing to try might be gcc 7.4, which was the final gcc 7 release. -- Torbjörn Please encrypt, key id 0xC8601622 ___ gmp-bugs mailing list gmp-bugs@gmplib.org https://gmplib.org/mailman/listinfo/gmp-bugs
Re: Compiling for ARMv8-A Using GCC 7.2.0 - Assertion error in gen-fac
"Damm, Stephen" writes: > I was able to narrow down the cause. In GC 7.2.0 the GMP_LLIMB_MASK is wrong: > > =GCC 4.8.5= > GMP_LIMB_BITS=64 > GMP_LLIMB_MASK=4294967295=0x > > =GCC 7.2.0= > GMP_LIMB_BITS=64 > GMP_LLIMB_MASK=1=0x0001 > > From my understanding this might be a difference in how GCC 7.2.0 handles > unsigned longs vs GCC 4.8.5. It also could be I am missing some vital > compiler flag for GMP. Can you file a gcc bug? These constants are defined as #define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)/* 64, you say */ #define GMP_HLIMB_BIT ((mp_limb_t) 1 << (GMP_LIMB_BITS / 2)) #define GMP_LLIMB_MASK (GMP_HLIMB_BIT - 1) I see no reasonable way that can end up defining GMP_LLIMB_MASK as 1. Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677. Internet email is subject to wholesale government surveillance. ___ gmp-bugs mailing list gmp-bugs@gmplib.org https://gmplib.org/mailman/listinfo/gmp-bugs