[newlib-cygwin] fenv.h: Change fexcept_t to integral type for compatibility

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=279aaeb5c7511cacd5496603a6dbd2901bc8e9af

commit 279aaeb5c7511cacd5496603a6dbd2901bc8e9af
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Mar 30 00:12:22 2016 +0200

    fenv.h: Change fexcept_t to integral type for compatibility
    
    On Linux and in Mingw-w64, fexcept_t is defined as type unsigned short.
    There are packages in the wild which rely on the fact that fexcept_t is
    an integral type.  We're changing the internal handling to use the bits
    just as in GLibc, so only the 6 lowest bits are used to reflect the hw
    bits.  We even change the header file guard to reflect GLibc for compatibility.
    
    	* include/fenv.h (_FENV_H): Rename from _FENV_H_ and set to 1 as in
    	GLibc's header.
    	(fexcept_t): Change to __uint16_t to be an integral type as in GLibc.
    	* fenv.cc (fegetexceptflag): Align to the *flagp's type change.
    	(fesetexceptflag): Ditto.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/fenv.cc        |  9 ++++-----
 winsup/cygwin/include/fenv.h | 14 +++++---------
 2 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/winsup/cygwin/fenv.cc b/winsup/cygwin/fenv.cc
index 5443681..f025a17 100644
--- a/winsup/cygwin/fenv.cc
+++ b/winsup/cygwin/fenv.cc
@@ -295,9 +295,8 @@ fegetexceptflag (fexcept_t *flagp, int excepts)
   if (use_sse)
     __asm__ volatile ("stmxcsr %0" : "=m" (mxcsr) : );
 
-  /* Mask undesired bits out and set result struct.  */
-  flagp->_fpu_exceptions = (sw & excepts);
-  flagp->_sse_exceptions = (mxcsr & excepts);
+  /* Mask undesired bits out and set result.  */
+  *flagp = (sw | mxcsr) & excepts;
 
   return 0;
 }
@@ -317,9 +316,9 @@ fesetexceptflag (const fexcept_t *flagp, int excepts)
 
   /* Set/Clear desired exception bits.  */
   fenv._fpu._fpu_sw &= ~excepts;
-  fenv._fpu._fpu_sw |= (excepts & flagp->_fpu_exceptions);
+  fenv._fpu._fpu_sw |= excepts & *flagp;
   fenv._sse_mxcsr &= ~excepts;
-  fenv._sse_mxcsr |= (excepts & flagp->_sse_exceptions);
+  fenv._sse_mxcsr |= excepts & *flagp;
 
   /* Set back into FPU state.  */
   return fesetenv (&fenv);
diff --git a/winsup/cygwin/include/fenv.h b/winsup/cygwin/include/fenv.h
index 4976913..2646425 100644
--- a/winsup/cygwin/include/fenv.h
+++ b/winsup/cygwin/include/fenv.h
@@ -8,8 +8,8 @@ This software is a copyrighted work licensed under the terms of the
 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
-#ifndef _FENV_H_
-#define _FENV_H_
+#ifndef _FENV_H
+#define _FENV_H 1
 
 #include <sys/cdefs.h>
 
@@ -72,13 +72,9 @@ typedef struct _fenv_t
    of exceptional floating-point arithmetic to provide auxiliary information.
     A floating-point control mode is a system variable whose value may be
    set by the user to affect the subsequent behavior of floating-point
-   arithmetic.  */
+   arithmetic. */
 
-typedef struct _fexcept_t
-{
-  unsigned short _fpu_exceptions;
-  unsigned short _sse_exceptions;
-} fexcept_t;
+typedef __uint32_t fexcept_t;
 
 /*  The <fenv.h> header shall define the following constants if and only
    if the implementation supports the floating-point exception by means
@@ -176,4 +172,4 @@ extern int fegetexcept (void);
 }
 #endif
 
-#endif /* _FENV_H_ */
+#endif /* _FENV_H */