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* [gcc r12-6452] [Ada] Adapt ghost code to maintain proof
@ 2022-01-11 13:27 Pierre-Marie de Rodat
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From: Pierre-Marie de Rodat @ 2022-01-11 13:27 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:371b4ad7c423891d13f9b855f5fdd469a82f7160
commit r12-6452-g371b4ad7c423891d13f9b855f5fdd469a82f7160
Author: Yannick Moy <moy@adacore.com>
Date: Tue Jan 4 10:37:53 2022 +0100
[Ada] Adapt ghost code to maintain proof
gcc/ada/
* libgnat/s-expmod.adb (Exp_Modular): Add assertions.
Diff:
---
gcc/ada/libgnat/s-expmod.adb | 3 +++
1 file changed, 3 insertions(+)
diff --git a/gcc/ada/libgnat/s-expmod.adb b/gcc/ada/libgnat/s-expmod.adb
index 61faed16b25..60d86e505b8 100644
--- a/gcc/ada/libgnat/s-expmod.adb
+++ b/gcc/ada/libgnat/s-expmod.adb
@@ -278,6 +278,7 @@ is
(Big (Result) * Big (Factor) ** (Exp - 1),
Big (Left) ** Right));
Lemma_Exp_Expand (Big (Factor), Exp - 1);
+ pragma Assert (Exp / 2 = (Exp - 1) / 2);
end if;
Lemma_Exp_Expand (Big (Factor), Exp);
@@ -286,6 +287,8 @@ is
exit when Exp = 0;
Rest := Big (Factor) ** Exp;
+ pragma Assert (Equal_Modulo
+ (Big (Result) * (Rest * Rest), Big (Left) ** Right));
Lemma_Exp_Mod (Big (Factor) * Big (Factor), Exp, Big (Modulus));
pragma Assert
((Big (Factor) * Big (Factor)) ** Exp = Rest * Rest);
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