[BZ #376]

Update.
	* sysdeps/generic/s_fdim.c: Handle +inf/+inf
	* sysdeps/generic/s_fdimf.c: Likewise.
	* sysdeps/generic/s_fdiml.c: Likewise.
	* sysdeps/i386/i686/fpu/s_fdim.S: Likewise.
	* sysdeps/i386/i686/fpu/s_fdimf.S: Likewise.
	* sysdeps/i386/i686/fpu/s_fdiml.S: Likewise.
	* sysdeps/powerpc/fpu/s_fdim.c: Likewise.
	* sysdeps/powerpc/fpu/s_fdimf.c: Likewise.
	* sysdeps/x86_64/fpu/s_fdiml.S: Likewise.
	* math/libm-test.inc (fdim_test): Add test case.  [BZ #376].

9 files changed, 34 insertions, 26 deletions

diff --git a/sysdeps/generic/s_fdim.c b/sysdeps/generic/s_fdim.c
index 201f93692e..5804e631c3 100644
--- a/sysdeps/generic/s_fdim.c
+++ b/sysdeps/generic/s_fdim.c
@@ -1,5 +1,5 @@
 /* Return positive difference between arguments.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -31,7 +31,7 @@ __fdim (double x, double y)
     /* Raise invalid flag.  */
     return x - y;
 
-  return x < y ? 0 : x - y;
+  return x <= y ? 0 : x - y;
 }
 weak_alias (__fdim, fdim)
 #ifdef NO_LONG_DOUBLE
diff --git a/sysdeps/generic/s_fdimf.c b/sysdeps/generic/s_fdimf.c
index 64d54b7fe4..2f3ce303ae 100644
--- a/sysdeps/generic/s_fdimf.c
+++ b/sysdeps/generic/s_fdimf.c
@@ -1,5 +1,5 @@
 /* Return positive difference between arguments.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -31,6 +31,6 @@ __fdimf (float x, float y)
     /* Raise invalid flag.  */
     return x - y;
 
-  return x < y ? 0 : x - y;
+  return x <= y ? 0 : x - y;
 }
 weak_alias (__fdimf, fdimf)
diff --git a/sysdeps/generic/s_fdiml.c b/sysdeps/generic/s_fdiml.c
index 83049ae732..70246bafbd 100644
--- a/sysdeps/generic/s_fdiml.c
+++ b/sysdeps/generic/s_fdiml.c
@@ -1,5 +1,5 @@
 /* Return positive difference between arguments.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -31,6 +31,6 @@ __fdiml (long double x, long double y)
     /* Raise invalid flag.  */
     return x - y;
 
-  return x < y ? 0 : x - y;
+  return x <= y ? 0 : x - y;
 }
 weak_alias (__fdiml, fdiml)
diff --git a/sysdeps/i386/i686/fpu/s_fdim.S b/sysdeps/i386/i686/fpu/s_fdim.S
index e610973a56..30ecff4e7c 100644
--- a/sysdeps/i386/i686/fpu/s_fdim.S
+++ b/sysdeps/i386/i686/fpu/s_fdim.S
@@ -1,5 +1,5 @@
 /* Compute positive difference.
-   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -28,12 +28,14 @@ ENTRY(__fdim)
 	fucomi	%st(1), %st
 	jp	1f
 
-	fsubrp	%st, %st(1)
+	jc	3f
+	fstp	%st(1)
 	fldz
-	fcomi	%st(1), %st
-	fcmovb	%st(1), %st
 	jmp	2f
 
+3:	fsubrp	%st, %st(1)
+	ret
+
 1:	fucomi	%st(0), %st
 	fcmovnu	%st(1), %st
 2:	fstp	%st(1)
diff --git a/sysdeps/i386/i686/fpu/s_fdimf.S b/sysdeps/i386/i686/fpu/s_fdimf.S
index a22cbe9d66..888df14b6f 100644
--- a/sysdeps/i386/i686/fpu/s_fdimf.S
+++ b/sysdeps/i386/i686/fpu/s_fdimf.S
@@ -1,5 +1,5 @@
 /* Compute positive difference.
-   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -28,12 +28,14 @@ ENTRY(__fdimf)
 	fucomi	%st(1), %st
 	jp	1f
 
-	fsubrp	%st, %st(1)
+	jc	3f
+	fstp	%st(1)
 	fldz
-	fcomi	%st(1), %st
-	fcmovb	%st(1), %st
 	jmp	2f
 
+3:	fsubrp	%st, %st(1)
+	ret
+
 1:	fucomi	%st(0), %st
 	fcmovnu	%st(1), %st
 2:	fstp	%st(1)
diff --git a/sysdeps/i386/i686/fpu/s_fdiml.S b/sysdeps/i386/i686/fpu/s_fdiml.S
index fa3c51e462..cb0e26e367 100644
--- a/sysdeps/i386/i686/fpu/s_fdiml.S
+++ b/sysdeps/i386/i686/fpu/s_fdiml.S
@@ -1,5 +1,5 @@
 /* Compute positive difference.
-   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -28,12 +28,14 @@ ENTRY(__fdiml)
 	fucomi	%st(1), %st
 	jp	1f
 
-	fsubrp	%st, %st(1)
+	jc	3f
+	fstp	%st(1)
 	fldz
-	fcomi	%st(1), %st
-	fcmovb	%st(1), %st
 	jmp	2f
 
+3:	fsubrp	%st, %st(1)
+	ret
+
 1:	fucomi	%st(0), %st
 	fcmovnu	%st(1), %st
 2:	fstp	%st(1)
diff --git a/sysdeps/powerpc/fpu/s_fdim.c b/sysdeps/powerpc/fpu/s_fdim.c
index 165e2ff5a5..2b767addab 100644
--- a/sysdeps/powerpc/fpu/s_fdim.c
+++ b/sysdeps/powerpc/fpu/s_fdim.c
@@ -1,5 +1,5 @@
 /* Return positive difference between arguments.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,7 +22,7 @@
 double
 __fdim (double x, double y)
 {
-  return x < y ? 0 : x - y;
+  return x <= y ? 0 : x - y;
 }
 weak_alias (__fdim, fdim)
 #ifdef NO_LONG_DOUBLE
diff --git a/sysdeps/powerpc/fpu/s_fdimf.c b/sysdeps/powerpc/fpu/s_fdimf.c
index 997ec8983f..a27c1e4039 100644
--- a/sysdeps/powerpc/fpu/s_fdimf.c
+++ b/sysdeps/powerpc/fpu/s_fdimf.c
@@ -1,5 +1,5 @@
 /* Return positive difference between arguments.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,6 +22,6 @@
 float
 __fdimf (float x, float y)
 {
-  return x < y ? 0 : x - y;
+  return x <= y ? 0 : x - y;
 }
 weak_alias (__fdimf, fdimf)
diff --git a/sysdeps/x86_64/fpu/s_fdiml.S b/sysdeps/x86_64/fpu/s_fdiml.S
index 3460b0f979..d63ca00ef1 100644
--- a/sysdeps/x86_64/fpu/s_fdiml.S
+++ b/sysdeps/x86_64/fpu/s_fdiml.S
@@ -1,5 +1,5 @@
 /* Compute positive difference.
-   Copyright (C) 1997, 1998, 2002 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 2002, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -28,12 +28,14 @@ ENTRY(__fdiml)
 	fucomi	%st(1), %st
 	jp	1f
 
-	fsubrp	%st, %st(1)
+	jc	3f
+	fstp	%st(1)
 	fldz
-	fcomi	%st(1), %st
-	fcmovb	%st(1), %st
 	jmp	2f
 
+3:	fsubrp	%st, %st(1)
+	ret
+
 1:	fucomi	%st(0), %st
 	fcmovnu	%st(1), %st
 2:	fstp	%st(1)