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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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5
build-aux/m4/bitcoin_secp.m4
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@@ -1,8 +1,3 @@
dnl libsecp25k1 helper checks
AC_DEFUN([SECP_INT128_CHECK],[
has_int128=$ac_cv_type___int128
])
dnl escape "$0x" below using the m4 quadrigaph @S|@, and escape it again with a \ for the shell.
AC_DEFUN([SECP_64BIT_ASM_CHECK],[
AC_MSG_CHECKING(for x86_64 assembly availability)