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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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8
src/field_impl.h
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@@ -14,12 +14,12 @@
#include "util.h"
#include "num.h"
#if defined(USE_FIELD_10X26)
#include "field_10x26_impl.h"
#elif defined(USE_FIELD_5X52)
#if defined(SECP256K1_WIDEMUL_INT128)
#include "field_5x52_impl.h"
#elif defined(SECP256K1_WIDEMUL_INT64)
#include "field_10x26_impl.h"
#else
#error "Please select field implementation"
#error "Please select wide multiplication implementation"
#endif
SECP256K1_INLINE static int secp256k1_fe_equal(const secp256k1_fe *a, const secp256k1_fe *b) {