From c1cf80738219dbd70cba0c0c1244698aad842ec7 Mon Sep 17 00:00:00 2001
From: Steffen Jaeckel <s@jaeckel.eu>
Date: Thu, 5 Mar 2020 13:57:07 +0100
Subject: [PATCH] introduce MP_HAS_SET_DOUBLE

---
 demo/test.c       | 4 ++--
 mp_set_double.c   | 2 +-
 tommath_private.h | 7 +++++++
 3 files changed, 10 insertions(+), 3 deletions(-)

--- demo/test.c.orig	2019-10-22 09:44:44.000000000 +0000
+++ demo/test.c	2021-09-20 10:02:00.103699000 +0000
@@ -625,7 +625,7 @@
 
 }
 
-#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
+#if defined(MP_HAS_SET_DOUBLE)
 static int test_mp_set_double(void)
 {
    int i;
@@ -2461,7 +2461,7 @@
       T1(mp_read_write_sbin, MP_TO_SBIN),
       T1(mp_reduce_2k, MP_REDUCE_2K),
       T1(mp_reduce_2k_l, MP_REDUCE_2K_L),
-#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
+#if defined(MP_HAS_SET_DOUBLE)
       T1(mp_set_double, MP_SET_DOUBLE),
 #endif
       T1(mp_signed_rsh, MP_SIGNED_RSH),
--- bn_mp_set_double.c.orig	2019-10-22 09:44:44.000000000 +0000
+++ bn_mp_set_double.c	2021-09-20 10:05:36.466235000 +0000
@@ -3,7 +3,7 @@
 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
 /* SPDX-License-Identifier: Unlicense */
 
-#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
+#if defined(MP_HAS_SET_DOUBLE)
 mp_err mp_set_double(mp_int *a, double b)
 {
    uint64_t frac;
--- tommath_private.h.orig
+++ tommath_private.h
@@ -164,6 +164,13 @@ MP_STATIC_ASSERT(prec_geq_min_prec, MP_DEFAULT_DIGIT_COUNT >= MP_MIN_DIGIT_COUNT
  */
 #define MP_MAX_DIGIT_COUNT ((INT_MAX - 2) / MP_DIGIT_BIT)
 
+#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559) \
+   || defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64) \
+   || defined(__i386__) || defined(_M_X86) \
+   || defined(__aarch64__) || defined(__arm__)
+#define MP_HAS_SET_DOUBLE
+#endif
+
 /* random number source */
 extern MP_PRIVATE mp_err(*s_mp_rand_source)(void *out, size_t size);