[newlib-cygwin] Removed Soft float from MIPS

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=55a6e49a0813232bbca3b3e97bb03c22c5857639

commit 55a6e49a0813232bbca3b3e97bb03c22c5857639
Author: Eshan dhawan <eshandhawan51@gmail.com>
Date:   Thu Feb 4 03:34:06 2021 +0530

    Removed Soft float from MIPS
    
    This Patch removes Soft Float code from MIPS.
    Instead It adds the soft float code from RISCV
    
    The code came from FreeBSD and assumes the FreeBSD softfp
    implementation not the one with GCC. That was an overlooked and
    fixed in the other fenv code already.
    
    Signed-off-by: Eshan Dhawan <eshandhawan51@gmail.com>

Diff:
---
 newlib/libc/machine/mips/machine/fenv-softfloat.h | 49 +++++++++--------------
 newlib/libm/machine/mips/fenv.c                   | 10 -----
 2 files changed, 18 insertions(+), 41 deletions(-)

diff --git a/newlib/libc/machine/mips/machine/fenv-softfloat.h b/newlib/libc/machine/mips/machine/fenv-softfloat.h
index cf13e73fc..43340e596 100644
--- a/newlib/libc/machine/mips/machine/fenv-softfloat.h
+++ b/newlib/libc/machine/mips/machine/fenv-softfloat.h
@@ -50,16 +50,11 @@
  * doesn't matter how you define them.
  */
 #include <errno.h>
-int __softfloat_float_exception_flags;
-int __softfloat_float_exception_mask;
-int __softfloat_float_rounding_mode;
-
 
 __fenv_static inline int
 feclearexcept(int excepts)
 {
 
-	__softfloat_float_exception_flags &= ~excepts;
 	return (0);
 }
 
@@ -67,16 +62,14 @@ __fenv_static inline int
 fegetexceptflag(fexcept_t *flagp, int excepts)
 {
 
-	*flagp = __softfloat_float_exception_flags & excepts;
 	return (0);
+
 }
 
 __fenv_static inline int
 fesetexceptflag(const fexcept_t *flagp, int excepts)
 {
 
-	__softfloat_float_exception_flags &= ~excepts;
-	__softfloat_float_exception_flags |= *flagp & excepts;
 	return (0);
 }
 
@@ -84,7 +77,7 @@ __fenv_static inline int
 feraiseexcept(int excepts)
 {
 
-return(excepts  ?  -ENOTSUP : 0 );
+	return( excepts != 0 );
 
 }
 
@@ -92,21 +85,25 @@ __fenv_static inline int
 fetestexcept(int excepts)
 {
 
-	return (__softfloat_float_exception_flags & excepts);
+	return (0);
 }
 
 __fenv_static inline int
 fegetround(void)
 {
 
-	return (__softfloat_float_rounding_mode);
+#ifdef FE_TONEAREST
+	return FE_TONEAREST;
+#else
+	return 0;
+#endif
+
 }
 
 __fenv_static inline int
 fesetround(int rounding_mode)
 {
 
-	__softfloat_float_rounding_mode = rounding_mode;
 	return (0);
 }
 
@@ -114,19 +111,13 @@ __fenv_static inline int
 fegetenv(fenv_t *envp)
 {
 
-	__set_env(*envp, __softfloat_float_exception_flags,
-	    __softfloat_float_exception_mask, __softfloat_float_rounding_mode);
 	return (0);
 }
 
 __fenv_static inline int
 feholdexcept(fenv_t *envp)
 {
-	fenv_t __env;
 
-	fegetenv(envp);
-	__softfloat_float_exception_flags = 0;
-	__softfloat_float_exception_mask = 0;
 	return (0);
 }
 
@@ -134,19 +125,19 @@ __fenv_static inline int
 fesetenv(const fenv_t *envp)
 {
 
-	__softfloat_float_exception_flags = __env_flags(*envp);
-	__softfloat_float_exception_mask = __env_mask(*envp);
-	__softfloat_float_rounding_mode = __env_round(*envp);
+
 	return (0);
 }
 
 __fenv_static inline int
 feupdateenv(const fenv_t *envp)
 {
-	int __oflags = __softfloat_float_exception_flags;
 
-	fesetenv(envp);
-	feraiseexcept(__oflags);
+#if defined FE_NOMASK_ENV && FE_ALL_EXCEPT != 0
+	  if (envp == FE_NOMASK_ENV)
+	      return 1;
+#endif
+
 	return (0);
 }
 
@@ -157,26 +148,22 @@ feupdateenv(const fenv_t *envp)
 __fenv_static inline int
 feenableexcept(int __mask)
 {
-	int __omask = __softfloat_float_exception_mask;
 
-	__softfloat_float_exception_mask |= __mask;
-	return (__omask);
+	return (0);
 }
 
 __fenv_static inline int
 fedisableexcept(int __mask)
 {
-	int __omask = __softfloat_float_exception_mask;
 
-	__softfloat_float_exception_mask &= ~__mask;
-	return (__omask);
+	return (0);
 }
 
 __fenv_static inline int
 fegetexcept(void)
 {
 
-	return (__softfloat_float_exception_mask);
+	return (0);
 }
 
 #endif /* __BSD_VISIBLE */
diff --git a/newlib/libm/machine/mips/fenv.c b/newlib/libm/machine/mips/fenv.c
index 6e4bb8f33..e2179eb20 100644
--- a/newlib/libm/machine/mips/fenv.c
+++ b/newlib/libm/machine/mips/fenv.c
@@ -44,20 +44,10 @@
  * this as a default environment.
  */
 
-
 #ifdef	__mips_soft_float
-#define __set_env(env, flags, mask, rnd) env = ((flags)                 \
-                                                | (mask)<<_FPUSW_SHIFT  \
-                                                | (rnd) << 24)
-#define __env_flags(env)                ((env) & FE_ALL_EXCEPT)
-#define __env_mask(env)                 (((env) >> _FPUSW_SHIFT)        \
-                                                & FE_ALL_EXCEPT)
-#define __env_round(env)                (((env) >> 24) & _ROUND_MASK)
 #include <machine/fenv-softfloat.h>
 #endif
 
-
-
 extern inline int feclearexcept(int excepts);
 extern inline int fegetexceptflag(fexcept_t *flagp, int excepts);
 extern inline int fesetexceptflag(const fexcept_t *flagp, int excepts);