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Merge pull request #5468 from Unity-Technologies/mbedtls-2.28-windows-arm64-workaround

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Backport 2.28: Don't inline mbedtls_mpi_safe_cond_assign on MSVC/ARM64 to avoid a compiler bug
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Manuel Pégourié-Gonnard 2022-02-01 09:21:37 +01:00 committed by GitHub
commit b72ecfd5a0
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7
library/constant_time.c
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@ -533,6 +533,13 @@ cleanup:
* about whether the assignment was made or not.
* (Leaking information about the respective sizes of X and Y is ok however.)
*/
#if defined(_MSC_VER) && defined(_M_ARM64) && (_MSC_FULL_VER < 193131103)
/*
* MSVC miscompiles this function if it's inlined prior to Visual Studio 2022 version 17.1. See:
* https://developercommunity.visualstudio.com/t/c-compiler-miscompiles-part-of-mbedtls-library-on/1646989
*/
__declspec(noinline)
#endif
int mbedtls_mpi_safe_cond_assign( mbedtls_mpi *X,
const mbedtls_mpi *Y,
unsigned char assign )