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Disable optimiization of BN_num_bits_word() for VS2005 ARM compiler due to

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its miscompilation of the function.
https://mta.openssl.org/pipermail/openssl-users/2018-August/008465.html

Reviewed-by: Mark J. Cox <mark@awe.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11526)
This commit is contained in:
aSoujyuTanaka 2020-04-12 03:58:44 +09:00 committed by Richard Levitte
parent 6c2a56beec
commit 7a09fab2b3
1 changed files with 12 additions and 0 deletions
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12
crypto/bn/bn_lib.c
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@ -88,6 +88,15 @@ const BIGNUM *BN_value_one(void)
return &const_one;
}
/*
* Old Visual Studio ARM compiler miscompiles BN_num_bits_word()
* https://mta.openssl.org/pipermail/openssl-users/2018-August/008465.html
*/
#if defined(_MSC_VER) && defined(_ARM_) && defined(_WIN32_WCE) \
&& _MSC_VER>=1400 && _MSC_VER<1501
# define MS_BROKEN_BN_num_bits_word
# pragma optimize("", off)
#endif
int BN_num_bits_word(BN_ULONG l)
{
BN_ULONG x, mask;
@ -132,6 +141,9 @@ int BN_num_bits_word(BN_ULONG l)
return bits;
}
#ifdef MS_BROKEN_BN_num_bits_word
# pragma optimize("", on)
#endif
/*
* This function still leaks `a->dmax`: it's caller's responsibility to