msvcrt: Don't set x87 control word in x86_64 fesetenv.

Signed-off-by: Piotr Caban <piotr@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

msvcrt: Don't set x87 control word in x86_64 fesetenv.
67c7c403 · Piotr Caban · Alexandre Julliard · 5189d73b · 67c7c403
Commit 67c7c403 authored Jul 21, 2021 by Piotr Caban Committed by Alexandre Julliard Jul 21, 2021
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math.c dlls/msvcrt/math.c +4 -0

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--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -5873,6 +5873,7 @@ 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;
@@ -5887,6 +5888,7 @@ int CDECL fesetenv(const fenv_t *env)
        WORD data_segment;
        WORD unused5;
    } fenv;
+#endif

    TRACE( "(%p)\n", env );

@@ -5900,6 +5902,7 @@ int CDECL fesetenv(const fenv_t *env)
    if (!fenv_decode(env->_Fe_stat, &x87_stat, &sse_stat))
        return 1;

+#ifdef __i386__
    __asm__ __volatile__( "fnstenv %0" : "=m" (fenv) );

    fenv.control_word &= ~0xc3d;
@@ -5938,6 +5941,7 @@ 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)
    {