From: Ulrich Drepper <drepper@redhat.com>
Date: Sun, 6 Jul 1997 21:45:05 +0000 (+0000)
Subject: Correct the FE_INEXACT and FE_UNDERFLOW cases.
X-Git-Tag: glibc-2.16-ports-before-merge~3485
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c49416b519d6bf2a2236b038fd7c571a811e0382;p=thirdparty%2Fglibc.git

Correct the FE_INEXACT and FE_UNDERFLOW cases.
---

diff --git a/sysdeps/m68k/fpu/fraiseexcpt.c b/sysdeps/m68k/fpu/fraiseexcpt.c
index 51411dd2923..d509604e281 100644
--- a/sysdeps/m68k/fpu/fraiseexcpt.c
+++ b/sysdeps/m68k/fpu/fraiseexcpt.c
@@ -48,15 +48,43 @@ feraiseexcept (int excepts)
   /* Next: overflow.  */
   if (excepts & FE_OVERFLOW)
     {
+      /* We cannot raise the overflow exception without also setting the
+	 inexact flag.  Restore it after the operation, unless it should
+	 be set anyway.  */
       long double d = LDBL_MAX;
-      __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d));
+      fexcept_t fpsr;
+
+      __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
+      __asm__ __volatile__ ("fmul%.x %0,%0" : "=f" (d) : "0" (d));
+      if (!((excepts | fpsr) & FE_INEXACT))
+	{
+	  __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
+	  fpsr &= ~FE_INEXACT;
+	  __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
+	}
+      else
+	__asm__ ("fnop");
     }
 
   /* Next: underflow.  */
   if (excepts & FE_UNDERFLOW)
     {
-      long double d = LDBL_MIN;
-      __asm__ __volatile__ ("fdiv%.s %#0r16,%0; fnop" : "=f" (d) : "0" (d));
+      /* We cannot raise the underflow exception without also setting the
+	 inexact flag.  Restore it after the operation, unless it should
+	 be set anyway.  */
+      long double d = -LDBL_MAX;
+      fexcept_t fpsr;
+
+      __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
+      __asm__ __volatile__ ("fetox%.x %0" : "=f" (d) : "0" (d));
+      if (!((excepts | fpsr) & FE_INEXACT))
+	{
+	  __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
+	  fpsr &= ~FE_INEXACT;
+	  __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
+	}
+      else
+	__asm__ ("fnop");
     }
 
   /* Last: inexact.  */