I needed to multiply U128 = U96 * U32 on an ARM the other day, and dida hack job in C. It is logically correct, but it probably takes 3-10times as long as assembly-language.Are there any large integer and similar libraries out there for theARM?The GMP is a great resource, of course, but it isn't very applicableto embedded systems because of:(a)Dynamic allocation.(b)Variable-size operands, which mean looping and branching, whichcauses pipelined RISC machines not to perform as well as they would ifthe code were written in a linear way.Anything out there?Thanks, Dave Ashley

I've been working on untangling the OpenSSL bignum library free from OpenSSL. I've found it confusing because of a lot of upward dependencies, and the fact that the ./configure intermingles option setting for the whole package. One target that may be nearby is to group the options that only bignum needs into a single .h file. Mel.

I was referring to GCC's "-pedantic" option.cf. Regards.

Thanks, now I understand.Using I got this:1. ostentatious in one's learning. 2. overly concerned with minute details or formalisms, especially inteaching.The definition you provided is (I think) #2, and it wasn't clickingfor me by just reading the dictionary definition and the documentationof the compiler parameter.DTA

Any Large Integer Libraries Out There for the ARM?

Apr 18, 2012 43 Replies

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Noob 14 years ago

I was referring to GCC's "-pedantic" option.

cf.

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Regards.

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Noob 14 years ago

He didn't provide the prototype of mul_32_96, but given the function call, one could assume

void mul_32_96(uint32_t *in32, uint32_t *in96, uint32_t *mynum);

where aliasing could indeed happen.

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Christopher Head 14 years ago

In that case it could. I assumed in96 was some kind of 96-bit-long type, probably a struct. If they're all uint32_t pointers, then of course they could alias.

Chris

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David T. Ashley 14 years ago

Thanks, now I understand.

Using

formatting link

I got this:

ostentatious in one's learning.
overly concerned with minute details or formalisms, especially in teaching.

The definition you provided is (I think) #2, and it wasn't clicking for me by just reading the dictionary definition and the documentation of the compiler parameter.

DTA

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