From da55a453d1422d37b5684ea3ddaf7ef95bf6d7a3 Mon Sep 17 00:00:00 2001
From: Piotr Caban <piotr@codeweavers.com>
Date: Tue, 25 May 2021 15:21:15 +0200
Subject: [PATCH] msvcrt: Import asinh implementation from musl.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 configure             |  1 -
 configure.ac          |  1 -
 dlls/msvcrt/math.c    | 20 +++++++++++++++++++-
 dlls/msvcrt/unixlib.c | 18 ------------------
 dlls/msvcrt/unixlib.h |  1 -
 include/config.h.in   |  3 ---
 6 files changed, 19 insertions(+), 25 deletions(-)

diff --git a/configure b/configure
index d7b558784fd..9b41d4ff072 100755
--- a/configure
+++ b/configure
@@ -19616,7 +19616,6 @@ $as_echo "#define HAVE_ISNAN 1" >>confdefs.h
 fi
 
 for ac_func in \
-	asinh \
 	atanh \
 	atanhf \
 	exp2 \
diff --git a/configure.ac b/configure.ac
index 73afcc9c6d0..6674e0d15df 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2656,7 +2656,6 @@ then
 fi
 
 AC_CHECK_FUNCS(\
-	asinh \
 	atanh \
 	atanhf \
 	exp2 \
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 65d01105a45..8d4ca7bb3fb 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -6569,10 +6569,28 @@ double CDECL fmin(double x, double y)
 
 /*********************************************************************
  *      asinh (MSVCR120.@)
+ *
+ * Copied from musl: src/math/asinh.c
  */
 double CDECL asinh(double x)
 {
-    return unix_funcs->asinh( x );
+    UINT64 ux = *(UINT64*)&x;
+    int e = ux >> 52 & 0x7ff;
+    int s = ux >> 63;
+
+    /* |x| */
+    ux &= (UINT64)-1 / 2;
+    x = *(double*)&ux;
+
+    if (e >= 0x3ff + 26) /* |x| >= 0x1p26 or inf or nan */
+        x = log(x) + 0.693147180559945309417232121458176568;
+    else if (e >= 0x3ff + 1) /* |x| >= 2 */
+        x = log(2 * x + 1 / (sqrt(x * x + 1) + x));
+    else if (e >= 0x3ff - 26) /* |x| >= 0x1p-26 */
+        x = log1p(x + x * x / (sqrt(x * x + 1) + 1));
+    else /* |x| < 0x1p-26, raise inexact if x != 0 */
+        fp_barrier(x + 0x1p120f);
+    return s ? -x : x;
 }
 
 /*********************************************************************
diff --git a/dlls/msvcrt/unixlib.c b/dlls/msvcrt/unixlib.c
index f937ee5e65e..ce055c8ea03 100644
--- a/dlls/msvcrt/unixlib.c
+++ b/dlls/msvcrt/unixlib.c
@@ -42,23 +42,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
-/*********************************************************************
- *      asinh
- */
-static double CDECL unix_asinh(double x)
-{
-#ifdef HAVE_ASINH
-    return asinh(x);
-#else
-    if (!isfinite(x*x+1))
-    {
-        if (x > 0) return log(2) + log(x);
-        else return -log(2) - log(-x);
-    }
-    return log(x + sqrt(x*x+1));
-#endif
-}
-
 /*********************************************************************
  *      atanh
  */
@@ -410,7 +393,6 @@ static float CDECL unix_tgammaf(float x)
 
 static const struct unix_funcs funcs =
 {
-    unix_asinh,
     unix_atanh,
     unix_atanhf,
     unix_cosh,
diff --git a/dlls/msvcrt/unixlib.h b/dlls/msvcrt/unixlib.h
index 6a3732234a2..f915f2f92d0 100644
--- a/dlls/msvcrt/unixlib.h
+++ b/dlls/msvcrt/unixlib.h
@@ -23,7 +23,6 @@
 
 struct unix_funcs
 {
-    double          (CDECL *asinh)(double x);
     double          (CDECL *atanh)(double x);
     float           (CDECL *atanhf)(float x);
     double          (CDECL *cosh)(double x);
diff --git a/include/config.h.in b/include/config.h.in
index f44f72c459d..bca2d843e58 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -25,9 +25,6 @@
 /* Define to 1 if you have the <arpa/nameser.h> header file. */
 #undef HAVE_ARPA_NAMESER_H
 
-/* Define to 1 if you have the `asinh' function. */
-#undef HAVE_ASINH
-
 /* Define to 1 if you have the <asm/types.h> header file. */
 #undef HAVE_ASM_TYPES_H