From: Piotr Caban <piotr@codeweavers.com>
Subject: [PATCH] msvcrt: Don't set x87 control word in x86_64 fesetenv.
Message-Id: <c0dc3be1-c650-6c8c-5dbc-292640ade4ea@codeweavers.com>
Date: Tue, 20 Jul 2021 19:14:05 +0200

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51215
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
---
  dlls/msvcrt/math.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 6dc0397ac27..a18a4cb6159 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -5874,6 +5874,7 @@ int CDECL fesetenv(const fenv_t *env)
 {
 #if (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
     unsigned int x87_cw, sse_cw, x87_stat, sse_stat;
+#ifdef __i386__
     struct {
         WORD control_word;
         WORD unused1;
@@ -5888,6 +5889,7 @@ int CDECL fesetenv(const fenv_t *env)
         WORD data_segment;
         WORD unused5;
     } fenv;
+#endif
 
     TRACE( "(%p)\n", env );
 
@@ -5906,6 +5908,7 @@ int CDECL fesetenv(const fenv_t *env)
     x87_stat = sse_stat = env->_Fe_stat;
 #endif
 
+#ifdef __i386__
     __asm__ __volatile__( "fnstenv %0" : "=m" (fenv) );
 
     fenv.control_word &= ~0xc3d;
@@ -5944,6 +5947,7 @@ int CDECL fesetenv(const fenv_t *env)
 
     __asm__ __volatile__( "fldenv %0" : : "m" (fenv) : "st", "st(1)",
             "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)" );
+#endif
 
     if (sse2_supported)
     {