From: Pierre-Marie de Rodat <derodat@adacore.com>
To: gcc-patches@gcc.gnu.org
Cc: Pierre-Alexandre Bazin <bazin@adacore.com>
Subject: [Ada] Prove double precision integer arithmetic unit
Date: Wed, 10 Nov 2021 08:58:39 +0000 [thread overview]
Message-ID: <20211110085839.GA2811142@adacore.com> (raw)
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This unit is used to implement the rutime support for fixed-point
operations (conversions, multiplication, division and I/O). Its
correctness is proved with GNATprove.
Proof is performed with GNATprove options --level=4 --prover=all
Proof requires use of the special Big_Integers_Ghost unit for spec and
proof. Mark also the units analyzed as being in SPARK with aspect
SPARK_Mode.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* libgnat/a-nbnbig.ads: Mark the unit as Pure.
* libgnat/s-aridou.adb: Add contracts and ghost code for proof.
(Scaled_Divide): Reorder operations and use of temporaries in
two places to facilitate proof.
* libgnat/s-aridou.ads: Add full functional contracts.
* libgnat/s-arit64.adb: Mark in SPARK.
* libgnat/s-arit64.ads: Add contracts similar to those from
s-aridou.ads.
* rtsfind.ads: Document the limitation that runtime units
loading does not work for private with-clauses.
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reply other threads:[~2021-11-10 8:58 UTC|newest]
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