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Communication Dans Un Congrès Année : 2022

Formally verified 32- and 64-bit integer division using double-precision floating-point arithmetic

David Monniaux

Résumé

Some recent processors are not equipped with an integer division unit. Compilers then implement division by a call to a special function supplied by the processor designers, which implements division by a loop producing one bit of quotient per iteration. This hinders compiler optimizations and results in non-constant time computation, which is a problem in some applications. We advocate instead using the processor's floating-point unit, and propose code that the compiler can easily interleave with other computations. We fully proved the correctness of our algorithm, which mixes floating-point and fixed-bitwidth integer computations, using the Coq proof assistant and successfully integrated it into the CompCert formally verified compiler.
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Dates et versions

hal-03722203 , version 1 (13-07-2022)

Identifiants

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David Monniaux, Alice Pain. Formally verified 32- and 64-bit integer division using double-precision floating-point arithmetic. 2022 IEEE 29th Symposium on Computer Arithmetic (ARITH), Sep 2022, Lyon, France. pp.128-132, ⟨10.1109/ARITH54963.2022.00032⟩. ⟨hal-03722203⟩
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