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* [gcc r13-497] [Ada] Fix proof of double arithmetic units
@ 2022-05-16 8:44 Pierre-Marie de Rodat
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From: Pierre-Marie de Rodat @ 2022-05-16 8:44 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:c1e007985fef1389ba09f5b558aa4e7b9f03783f
commit r13-497-gc1e007985fef1389ba09f5b558aa4e7b9f03783f
Author: Yannick Moy <moy@adacore.com>
Date: Fri Mar 11 11:54:53 2022 +0100
[Ada] Fix proof of double arithmetic units
Proof of an assertion is not automatic anymore. Add two assertions
before it to guide the prover.
gcc/ada/
* libgnat/s-aridou.adb (Double_Divide): Add intermediate
assertions.
Diff:
---
gcc/ada/libgnat/s-aridou.adb | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gcc/ada/libgnat/s-aridou.adb b/gcc/ada/libgnat/s-aridou.adb
index ffb6f4ca269..08cbed7cefc 100644
--- a/gcc/ada/libgnat/s-aridou.adb
+++ b/gcc/ada/libgnat/s-aridou.adb
@@ -941,11 +941,13 @@ is
else
T2 := Yhi * Zlo;
pragma Assert (Big (T2) = Big (Double_Uns'(Yhi * Zlo)));
+ pragma Assert (Big_0 = Big (Double_Uns'(Ylo * Zhi)));
end if;
else
T2 := Ylo * Zhi;
pragma Assert (Big (T2) = Big (Double_Uns'(Ylo * Zhi)));
+ pragma Assert (Big_0 = Big (Double_Uns'(Yhi * Zlo)));
end if;
T1 := Ylo * Zlo;
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