+++ /dev/null
-diff --git a/build-aux/m4/bitcoin_secp.m4 b/build-aux/m4/bitcoin_secp.m4
-index 1373478..4a398d6 100644
---- a/build-aux/m4/bitcoin_secp.m4
-+++ b/build-aux/m4/bitcoin_secp.m4
-@@ -1,12 +1,6 @@
- dnl libsecp25k1 helper checks
- AC_DEFUN([SECP_INT128_CHECK],[
- has_int128=$ac_cv_type___int128
--if test x"$has_int128" != x"yes" && test x"$set_field" = x"64bit"; then
-- AC_MSG_ERROR([$set_field field support explicitly requested but is not compatible with this host])
--fi
--if test x"$has_int128" != x"yes" && test x"$set_scalar" = x"64bit"; then
-- AC_MSG_ERROR([$set_scalar scalar support explicitly requested but is not compatible with this host])
--fi
- ])
-
- dnl
-@@ -18,11 +12,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
- __asm__ __volatile__("movq $0x100000000,%1; mulq %%rsi" : "+a"(a) : "S"(tmp) : "cc", "%rdx");
- ]])],[has_64bit_asm=yes],[has_64bit_asm=no])
- AC_MSG_RESULT([$has_64bit_asm])
--if test x"$set_field" == x"64bit_asm"; then
-- if test x"$has_64bit_asm" == x"no"; then
-- AC_MSG_ERROR([$set_field field support explicitly requested but no x86_64 assembly available])
-- fi
--fi
- ])
-
- dnl
-@@ -43,7 +32,7 @@ else
- )])
- LIBS=
- fi
--if test x"$has_libcrypto" == x"yes" && test x"$has_openssl_ec" = x; then
-+if test x"$has_libcrypto" = x"yes" && test x"$has_openssl_ec" = x; then
- AC_MSG_CHECKING(for EC functions in libcrypto)
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
- #include <openssl/ec.h>
-@@ -69,11 +58,4 @@ if test x"$has_gmp" != x"yes"; then
- CPPFLAGS="$CPPFLAGS_TEMP"
- LIBS="$LIBS_TEMP"
- fi
--if test x"$set_field" = x"gmp" && test x"$has_gmp" != x"yes"; then
-- AC_MSG_ERROR([$set_field field support explicitly requested but libgmp was not found])
--fi
--if test x"$set_bignum" = x"gmp" && test x"$has_gmp" != x"yes"; then
-- AC_MSG_ERROR([$set_bignum field support explicitly requested but libgmp was not found])
--fi
- ])
--
-diff --git a/configure.ac b/configure.ac
-index 40e121e..bd99013 100644
---- a/configure.ac
-+++ b/configure.ac
-@@ -23,7 +23,7 @@ if test "x$CFLAGS" = "x"; then
- fi
-
- AC_PROG_CC_C99
--if test x"$ac_cv_prog_cc_c99" == x"no"; then
-+if test x"$ac_cv_prog_cc_c99" = x"no"; then
- AC_MSG_ERROR([c99 compiler support required])
- fi
-
-@@ -96,15 +96,18 @@ AC_ARG_ENABLE(endomorphism,
- [use_endomorphism=$enableval],
- [use_endomorphism=no])
-
--AC_ARG_WITH([field], [AS_HELP_STRING([--with-field=gmp|64bit|64bit_asm|32bit|auto],
-+AC_ARG_WITH([field], [AS_HELP_STRING([--with-field=gmp|64bit|32bit|auto],
- [Specify Field Implementation. Default is auto])],[req_field=$withval], [req_field=auto])
-
--AC_ARG_WITH([bignum], [AS_HELP_STRING([--with-bignum=gmp|none|auto],
-+AC_ARG_WITH([bignum], [AS_HELP_STRING([--with-bignum=gmp|no|auto],
- [Specify Bignum Implementation. Default is auto])],[req_bignum=$withval], [req_bignum=auto])
-
- AC_ARG_WITH([scalar], [AS_HELP_STRING([--with-scalar=64bit|32bit|auto],
- [Specify scalar implementation. Default is auto])],[req_scalar=$withval], [req_scalar=auto])
-
-+AC_ARG_WITH([asm], [AS_HELP_STRING([--with-asm=x86_64|no|auto]
-+[Specify assembly optimizations to use. Default is auto])],[req_asm=$withval], [req_asm=auto])
-+
- AC_CHECK_TYPES([__int128])
-
- AC_MSG_CHECKING([for __builtin_expect])
-@@ -113,40 +116,66 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void myfunc() {__builtin_expect(0,0);}]])],
- [ AC_MSG_RESULT([no])
- ])
-
--if test x"$req_field" = x"auto"; then
-+if test x"$req_asm" = x"auto"; then
- SECP_64BIT_ASM_CHECK
- if test x"$has_64bit_asm" = x"yes"; then
-- set_field=64bit_asm
-+ set_asm=x86_64
-+ fi
-+ if test x"$set_asm" = x; then
-+ set_asm=no
- fi
-+else
-+ set_asm=$req_asm
-+ case $set_asm in
-+ x86_64)
-+ SECP_64BIT_ASM_CHECK
-+ if test x"$has_64bit_asm" != x"yes"; then
-+ AC_MSG_ERROR([x86_64 assembly optimization requested but not available])
-+ fi
-+ ;;
-+ no)
-+ ;;
-+ *)
-+ AC_MSG_ERROR([invalid assembly optimization selection])
-+ ;;
-+ esac
-+fi
-
-+if test x"$req_field" = x"auto"; then
-+ if test x"set_asm" = x"x86_64"; then
-+ set_field=64bit
-+ fi
- if test x"$set_field" = x; then
- SECP_INT128_CHECK
- if test x"$has_int128" = x"yes"; then
- set_field=64bit
- fi
- fi
--
- if test x"$set_field" = x; then
- SECP_GMP_CHECK
- if test x"$has_gmp" = x"yes"; then
- set_field=gmp
- fi
- fi
--
- if test x"$set_field" = x; then
- set_field=32bit
- fi
- else
- set_field=$req_field
- case $set_field in
-- 64bit_asm)
-- SECP_64BIT_ASM_CHECK
-- ;;
- 64bit)
-- SECP_INT128_CHECK
-+ if test x"$set_asm" != x"x86_64"; then
-+ SECP_INT128_CHECK
-+ if test x"$has_int128" != x"yes"; then
-+ AC_MSG_ERROR([64bit field explicitly requested but neither __int128 support or x86_64 assembly available])
-+ fi
-+ fi
- ;;
- gmp)
- SECP_GMP_CHECK
-+ if test x"$has_gmp" != x"yes"; then
-+ AC_MSG_ERROR([gmp field explicitly requested but libgmp not available])
-+ fi
- ;;
- 32bit)
- ;;
-@@ -157,11 +186,9 @@ else
- fi
-
- if test x"$req_scalar" = x"auto"; then
-- if test x"$set_scalar" = x; then
-- SECP_INT128_CHECK
-- if test x"$has_int128" = x"yes"; then
-- set_scalar=64bit
-- fi
-+ SECP_INT128_CHECK
-+ if test x"$has_int128" = x"yes"; then
-+ set_scalar=64bit
- fi
- if test x"$set_scalar" = x; then
- set_scalar=32bit
-@@ -171,6 +198,9 @@ else
- case $set_scalar in
- 64bit)
- SECP_INT128_CHECK
-+ if test x"$has_int128" != x"yes"; then
-+ AC_MSG_ERROR([64bit scalar explicitly requested but __int128 support not available])
-+ fi
- ;;
- 32bit)
- ;;
-@@ -187,15 +217,18 @@ if test x"$req_bignum" = x"auto"; then
- fi
-
- if test x"$set_bignum" = x; then
-- set_bignum=none
-+ set_bignum=no
- fi
- else
- set_bignum=$req_bignum
- case $set_bignum in
- gmp)
- SECP_GMP_CHECK
-+ if test x"$has_gmp" != x"yes"; then
-+ AC_MSG_ERROR([gmp bignum explicitly requested but libgmp not available])
-+ fi
- ;;
-- none)
-+ no)
- ;;
- *)
- AC_MSG_ERROR([invalid bignum implementation selection])
-@@ -203,14 +236,21 @@ else
- esac
- fi
-
-+# select assembly optimization
-+case $set_asm in
-+x86_64)
-+ AC_DEFINE(USE_ASM_X86_64, 1, [Define this symbol to enable x86_64 assembly optimizations])
-+ ;;
-+no)
-+ ;;
-+*)
-+ AC_MSG_ERROR([invalid assembly optimizations])
-+ ;;
-+esac
-+
- # select field implementation
- case $set_field in
--64bit_asm)
-- AC_DEFINE(USE_FIELD_5X52_ASM, 1, [Define this symbol to use the assembly version for the 5x52 field implementation])
-- AC_DEFINE(USE_FIELD_5X52, 1, [Define this symbol to use the FIELD_5X52 implementation])
-- ;;
- 64bit)
-- AC_DEFINE(USE_FIELD_5X52_INT128, 1, [Define this symbol to use the __int128 version for the 5x52 field implementation])
- AC_DEFINE(USE_FIELD_5X52, 1, [Define this symbol to use the FIELD_5X52 implementation])
- ;;
- gmp)
-@@ -233,7 +273,7 @@ gmp)
- AC_DEFINE(USE_FIELD_INV_NUM, 1, [Define this symbol to use the num-based field inverse implementation])
- AC_DEFINE(USE_SCALAR_INV_NUM, 1, [Define this symbol to use the num-based scalar inverse implementation])
- ;;
--none)
-+no)
- AC_DEFINE(USE_NUM_NONE, 1, [Define this symbol to use no num implementation])
- AC_DEFINE(USE_FIELD_INV_BUILTIN, 1, [Define this symbol to use the native field inverse implementation])
- AC_DEFINE(USE_SCALAR_INV_BUILTIN, 1, [Define this symbol to use the native scalar inverse implementation])
-@@ -258,7 +298,7 @@ esac
-
- if test x"$use_tests" = x"yes"; then
- SECP_OPENSSL_CHECK
-- if test x"$has_openssl_ec" == x"yes"; then
-+ if test x"$has_openssl_ec" = x"yes"; then
- AC_DEFINE(ENABLE_OPENSSL_TESTS, 1, [Define this symbol if OpenSSL EC functions are available])
- SECP_TEST_INCLUDES="$SSL_CFLAGS $CRYPTO_CFLAGS"
- SECP_TEST_LIBS="$CRYPTO_LIBS"
-@@ -281,9 +321,11 @@ if test x"$use_endomorphism" = x"yes"; then
- AC_DEFINE(USE_ENDOMORPHISM, 1, [Define this symbol to use endomorphism optimization])
- fi
-
-+AC_MSG_NOTICE([Using assembly optimizations: $set_asm])
- AC_MSG_NOTICE([Using field implementation: $set_field])
- AC_MSG_NOTICE([Using bignum implementation: $set_bignum])
- AC_MSG_NOTICE([Using scalar implementation: $set_scalar])
-+AC_MSG_NOTICE([Using endomorphism optimizations: $use_endomorphism])
-
- AC_CONFIG_HEADERS([src/libsecp256k1-config.h])
- AC_CONFIG_FILES([Makefile libsecp256k1.pc])
-@@ -291,7 +333,6 @@ AC_SUBST(SECP_INCLUDES)
- AC_SUBST(SECP_LIBS)
- AC_SUBST(SECP_TEST_LIBS)
- AC_SUBST(SECP_TEST_INCLUDES)
--AM_CONDITIONAL([USE_ASM], [test x"$set_field" == x"64bit_asm"])
- AM_CONDITIONAL([USE_TESTS], [test x"$use_tests" != x"no"])
- AM_CONDITIONAL([USE_BENCHMARK], [test x"$use_benchmark" != x"no"])
-
-diff --git a/src/field_5x52_impl.h b/src/field_5x52_impl.h
-index 63176d6..a045db3 100644
---- a/src/field_5x52_impl.h
-+++ b/src/field_5x52_impl.h
-@@ -16,12 +16,10 @@
- #include "num.h"
- #include "field.h"
-
--#if defined(USE_FIELD_5X52_ASM)
-+#if defined(USE_ASM_X86_64)
- #include "field_5x52_asm_impl.h"
--#elif defined(USE_FIELD_5X52_INT128)
--#include "field_5x52_int128_impl.h"
- #else
--#error "Please select field_5x52 implementation"
-+#include "field_5x52_int128_impl.h"
- #endif
-
- /** Implements arithmetic modulo FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE FFFFFC2F,