The CORE function provides the implementation for ChaCha_OperateKeystream_ALTIVEC, ChaCha_OperateKeystream_POWER7, BLAKE2_Compress32_ALTIVEC and BLAKE2_Compress32_POWER7. Depending on the options used to compile the source files, either POWER7 or ALTIVEC will be used.
This is needed to support the "new toolchain, ancient hardware" use case.
GCM can do some bulk XOR's using the SIMD unit. However, we still need loads and stores to be fast. Fast loads and stores of unaligned data requires the VSX unit
adhoc.cpp was a bit uncomfortable because we had to copy it out from adhoc.cpp.proto. For some reason CMake could not perform the copy, so we started using pch.cpp in CMake. This commit keeps them consistent.
We may have problems with one test, and that is the Newlib tests. I seem to recall they a C++ header included to properly identify its use. We cross that bridge during MinGW testing.
This picks up about 0.2 cpb in ChaCha::OperateKeystream. It may not sound like much but it puts SSE2 intrinsics version on par with the ASM version of Salsa20. Salsa20 leads ChaCha by 0.1 to 0.15 cpb, which equates to about 50 MB/s.
I was not able to duplicate it under GCC. That includes the GCC's supplied with Debian 8 and Ubuntu 14. It looks like the problem was with Asan insread of the library
It looks like GCC is rejecting the -pthread option but it is advertising Pthread support by defining 39 related macros. I'm not sure what to make of it, but we can't use -pthread because it breaks the compile.
On my MinGW-w64 setup, the build failed:
>mingw32-make: *** No rule to make target 'winpipes.o', needed by 'libcryptopp.a'.
>mingw32-make: Target 'default' not remade because of errors.
Looks like `winpipes.cpp` was removed in f2171cbe2 but not de-listed from the `GNUmakefile`. Remove it.
SIMON-64 and SIMON-128 have different ISA requirements. The same applies to SPECK-64 and SPECK-128. GCC generated code that resulted in a SIGILL due to the ISA differences on a down level machine. The instructions was a mtfprwz from POWER8. It was prsent in a function prologue on a POWER7 machine.
Jeffrey Walton
Tanzinul Islam