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Autodetect __int128 availability on the C side

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Instead of supporting configuration of the field and scalar size independently,
both are now controlled by the availability of a 64x64->128 bit multiplication
(currently only through __int128). This is autodetected from the C code through
__SIZEOF_INT128__, but can be overridden using configure's
--with-test-override-wide-multiply, or by defining
USE_FORCE_WIDEMUL_{INT64,INT128} manually.
This commit is contained in:
Pieter Wuille
2020-08-09 10:58:40 -07:00
parent 0d7727f95e
commit 79f1f7a4f1
10 changed files with 69 additions and 134 deletions
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6
src/scalar_impl.h
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@@ -16,12 +16,12 @@
#if defined(EXHAUSTIVE_TEST_ORDER)
#include "scalar_low_impl.h"
#elif defined(USE_SCALAR_4X64)
#elif defined(SECP256K1_WIDEMUL_INT128)
#include "scalar_4x64_impl.h"
#elif defined(USE_SCALAR_8X32)
#elif defined(SECP256K1_WIDEMUL_INT64)
#include "scalar_8x32_impl.h"
#else
#error "Please select scalar implementation"
#error "Please select wide multiplication implementation"
#endif
static const secp256k1_scalar secp256k1_scalar_one = SECP256K1_SCALAR_CONST(0, 0, 0, 0, 0, 0, 0, 1);