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Fix "error "SSSE3 instruction set not enabled" when compiling using GCC version < 4.9 without -mssse3 option (SSSE3=1 when using make). (#507) 

Compiling with -mxxx defines the corresponding macro of the intrinsics.
For example, -mssse3 defines __SSSE3__ macro to 1.

In GCC versions < 4.9, it is not possible to use and call x86 intrinsics only at runtime without
compiling the entire file with the -mxxx option.

For example, if we want to call SSSE3 intrinsics without compiling with -mssse3, the macro __SSSE3__ is not defined.
Therefore, when including <tmmintrin.h>, this results in "error "SSSE3 instruction set not enabled"" because of :
	#ifndef __SSSE3__
	# error "SSSE3 instruction set not enabled"
Since GCC 4.9, this has been fixed and it is possible to call x86 intrinsics from select functions in a file
that are tagged with the corresponding target attribute without having to compile the entire file with the -mxxx option.
This can be seen in <tmmintrin.h> which in recent versions (>= 4.9) contains :
	#ifndef __SSSE3__
	#pragma GCC push_options
	#pragma GCC target("ssse3")
	#define __DISABLE_SSSE3__

Since SSSE3 is only used under Windows for ChaCha256, this can be fixed by preceding '#include <tmmintrin.h>' with
#if defined (_MSC_VER) && !defined (TC_WINDOWS_BOOT).

See https://gcc.gnu.org/gcc-4.9/changes.html
This commit is contained in:
El Mostafa Idrassi 2019-10-04 13:07:10 +01:00 committed by Mounir IDRASSI
parent 1fb81d1a43
commit 9a895bedde
1 changed files with 2 additions and 0 deletions
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src/Crypto/cpu.h
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@ -144,6 +144,7 @@ extern __m128i _mm_set1_epi64x (__int64 a);
#endif
#if CRYPTOPP_SSSE3_AVAILABLE || defined(__INTEL_COMPILER)
#if defined (_MSC_VER) && !defined (TC_WINDOWS_BOOT)
#if defined(TC_WINDOWS_DRIVER) || defined (_UEFI)
#if defined(__cplusplus)
extern "C" {
@ -155,6 +156,7 @@ extern __m128i _mm_shuffle_epi8 (__m128i a, __m128i b);
#else
#include <tmmintrin.h>
#endif
#endif
#if defined(__SSE4_1__) || defined(__INTEL_COMPILER) || defined(_MSC_VER)
#if defined(TC_WINDOWS_DRIVER) || defined (_UEFI)