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.
patch.diff.gz
Description: application/gzip
