From 5544e6de07392395b907333afd8b0e71e1a166aa Mon Sep 17 00:00:00 2001
From: Piotr Caban <piotr@codeweavers.com>
Date: Mon, 17 May 2021 15:38:18 +0200
Subject: [PATCH] msvcrt: Import truncf implementation from musl.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 configure             |  3 +--
 configure.ac          |  3 +--
 dlls/msvcrt/math.c    | 16 +++++++++++++++-
 dlls/msvcrt/unixlib.c | 13 -------------
 dlls/msvcrt/unixlib.h |  1 -
 include/config.h.in   |  3 ---
 6 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/configure b/configure
index 69b97958832..fe54e30321f 100755
--- a/configure
+++ b/configure
@@ -19644,8 +19644,7 @@ for ac_func in \
 	remquof \
 	tgamma \
 	tgammaf \
-	trunc \
-	truncf
+	trunc
 
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
diff --git a/configure.ac b/configure.ac
index 7fde36f7616..fb4ec181ea2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2684,8 +2684,7 @@ AC_CHECK_FUNCS(\
 	remquof \
 	tgamma \
 	tgammaf \
-	trunc \
-	truncf
+	trunc
 )
 LIBS="$ac_save_LIBS"
 
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 5682b00bb66..246f329ee95 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -4989,10 +4989,24 @@ double CDECL trunc(double x)
 
 /*********************************************************************
  *      truncf (MSVCR120.@)
+ *
+ * Copied from musl: src/math/truncf.c
  */
 float CDECL truncf(float x)
 {
-    return unix_funcs->truncf(x);
+    union {float f; UINT32 i;} u = {x};
+    int e = (u.i >> 23 & 0xff) - 0x7f + 9;
+    UINT32 m;
+
+    if (e >= 23 + 9)
+        return x;
+    if (e < 9)
+        e = 1;
+    m = -1U >> e;
+    if ((u.i & m) == 0)
+        return x;
+    u.i &= ~m;
+    return u.f;
 }
 
 /*********************************************************************
diff --git a/dlls/msvcrt/unixlib.c b/dlls/msvcrt/unixlib.c
index 83a1e5386c1..e809d7353ff 100644
--- a/dlls/msvcrt/unixlib.c
+++ b/dlls/msvcrt/unixlib.c
@@ -648,18 +648,6 @@ static double CDECL unix_trunc(double x)
 #endif
 }
 
-/*********************************************************************
- *      truncf
- */
-static float CDECL unix_truncf(float x)
-{
-#ifdef HAVE_TRUNCF
-    return truncf(x);
-#else
-    return unix_trunc(x);
-#endif
-}
-
 /*********************************************************************
  *      tgammaf
  */
@@ -735,7 +723,6 @@ static const struct unix_funcs funcs =
     unix_tgamma,
     unix_tgammaf,
     unix_trunc,
-    unix_truncf
 };
 
 NTSTATUS CDECL __wine_init_unix_lib( HMODULE module, DWORD reason, const void *ptr_in, void *ptr_out )
diff --git a/dlls/msvcrt/unixlib.h b/dlls/msvcrt/unixlib.h
index a86e2d34852..fd279cf5519 100644
--- a/dlls/msvcrt/unixlib.h
+++ b/dlls/msvcrt/unixlib.h
@@ -83,7 +83,6 @@ struct unix_funcs
     double          (CDECL *tgamma)(double x);
     float           (CDECL *tgammaf)(float x);
     double          (CDECL *trunc)(double x);
-    float           (CDECL *truncf)(float x);
 };
 
 #endif /* __UNIXLIB_H */
diff --git a/include/config.h.in b/include/config.h.in
index ce83ecacd8e..7fe9383a778 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -1013,9 +1013,6 @@
 /* Define to 1 if you have the `trunc' function. */
 #undef HAVE_TRUNC
 
-/* Define to 1 if you have the `truncf' function. */
-#undef HAVE_TRUNCF
-
 /* Define to 1 if you have the `udev' library (-ludev). */
 #undef HAVE_UDEV