Use PowerPC unaligned loads and stores with Power8. Formerly we were using Power7 as the floor because the IBM POWER Architecture manuals said unaligned loads and stores were available. However, some compilers generate bad code for unaligned loads and stores using `-march=power7`, so bump to a known good.
This should have been checked-in during GH #783 and PR #784. I think there was one mailing list message about missing symbols GF2NT_233_Multiply_Reduce_CLMUL and GF2NT_233_Square_Reduce_CLMUL. I missed it when attempting to reproduce the issue. I can duplicate it now using VS2013. I think the addition of CRYPTOPP_DLL caused the issue to surface.
As done with others tests. This will avoid a miss-detection of aarch64 features
when using flags such as _FORTIFY_SOURCE that needs to be filtered for testing
This fixes https://github.com/weidai11/cryptopp/issues/812
V2: Fix all cases
Signed-off-by: Nicolas Chauvet <kwizart@gmail.com>
The makefile tries to pre-qualify NEON (for lack of a better term), and sets IS_NEON accordingly. If IS_NEON=1, then we go on to perform test compiles to see if -mfloat-abi=X -mfpu=neon (and friends) actually work. Effectively we are performing a test to see if we should perform another test.
The IS_NEON flag predates our compile time feature tests. It was kind of helpful when we were trying to sort out if a platform and compiler options supported NEON without a compile test. That was an absolute mess and we quickly learned we needed a real compile time feature test (which we now have).
Additionally, Debian and Fedora ARMEL builds are failing because we are misdetecting NEON availability. It looks like we fail to set IS_NEON properly, so we never get into the code paths that set either (1) -mfloat-abi=X -mfpu=neon or (2) -DCRYPTOPP_DISABLE_NEON or -DCRYPTOPP_DISABLE_ASM. Later, the makefile builds a *_simd.cpp and the result is an error that NEON needs to be activated (or disabled).
This commit removes IS_NEON so we immediately move to compile time feature tests.
Jeffrey Walton
Nicolas Chauvet (kwizart)