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Rather than checking for emscripten, perform a 128-bit mul

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This commit is contained in:
Frank Denis 2017-12-27 00:10:18 +01:00
parent 5f5d36a9bb
commit d73d5f8ee6
1 changed files with 2 additions and 4 deletions
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6
configure.ac
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@ -644,10 +644,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifndef NATIVE_LITTLE_ENDIAN #ifndef NATIVE_LITTLE_ENDIAN
# error libsodium currently expects a little endian CPU for the 128-bit type # error libsodium currently expects a little endian CPU for the 128-bit type
#endif #endif
#ifdef __EMSCRIPTEN__
# error emscripten currently supports only shift operations on integers \
# larger than 64 bits
#endif
#include <stddef.h> #include <stddef.h>
#include <stdint.h> #include <stdint.h>
#if defined(__SIZEOF_INT128__) #if defined(__SIZEOF_INT128__)
@ -657,6 +653,8 @@ typedef unsigned uint128_t __attribute__((mode(TI)));
#endif #endif
void fcontract(uint128_t *t) { void fcontract(uint128_t *t) {
*t += 0x8000000000000 - 1; *t += 0x8000000000000 - 1;
*t *= *t;
*t >>= 84;
} }
]], [[ ]], [[
(void) fcontract; (void) fcontract;