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This was interesting... The C&-D is an early 2000's 32-bit processor with SSE2 and SSSE3. Using a destination register constraint of "xm" witnessed a crash, while a constraint of "m" does not
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gcm.cpp:89:50: error: impossible constraint in \\asm\
: "=xm" (a[0]) : "xm"(b[0]), "xm"(c[0]));
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SunCC 12.3 through 12.5 still cannot handle CLMUL, though. It would be nice if Sun fixed the regression.
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We determine machine capabilities by performing an os/platform *query* first, like getauxv(). If the *query* fails, we move onto a cpu *probe*. The cpu *probe* tries to exeute an instruction and then catches a SIGILL on Linux or the exception EXCEPTION_ILLEGAL_INSTRUCTION on Windows. Some OSes fail to hangle a SIGILL gracefully, like Apple OSes. Apple machines corrupt memory and variables around the probe.
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Move <arm_acle.h> logic into "sonfig.h". Detecting when we can/should include <arm_acle.h> is proving to be troublesome
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Use system includes for <arm_neon.h> and <arm_acle.h>
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Currently the CRYPTOPP_BOOL_XXX macros set the macro value to 0 or 1. If we remove setting the 0 value (the #else part of the expression), then the self tests speed up by about 0.3 seconds. I can't explain it, but I have observed it repeatedly.
This check-in prepares for the removal in Upstream master
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#461)
Split source files to support Base Implementation + SIMD implementation
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