--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2012-02-25  Bruno Haible  <bruno@clisp.org>
+
+	fabsf tests: More tests.
+	* tests/test-fabsf.c: Include <string.h>, minus-zero.h.
+	(zero): New variable.
+	(main): Add tests for signed zero.
+	* modules/fabsf-tests (Files): Add tests/minus-zero.h.
+
 2012-02-24  Bruno Haible  <bruno@clisp.org>
 
 	atanl: Provide function definition on MSVC.

--- a/modules/fabsf-tests
+++ b/modules/fabsf-tests
@@ -1,6 +1,7 @@
 Files:
 tests/test-fabsf.c
 tests/signature.h
+tests/minus-zero.h
 tests/macros.h
 
 Depends-on:

--- a/tests/test-fabsf.c
+++ b/tests/test-fabsf.c
@@ -23,10 +23,14 @@
 #include "signature.h"
 SIGNATURE_CHECK (fabsf, float, (float));
 
+#include <string.h>
+
 #include "macros.h"
+#include "minus-zero.h"
 
 volatile float x;
 float y;
+float zero = 0.0f;
 
 int
 main ()
@@ -41,5 +45,16 @@
   y = fabsf (x);
   ASSERT (y == 0.6f);
 
+  /* Signed zero.  */
+  x = 0.0f;
+  y = fabsf (x);
+  ASSERT (y == 0.0f);
+  ASSERT (memcmp (&y, &zero, sizeof y) == 0);
+
+  x = minus_zerof;
+  y = fabsf (x);
+  ASSERT (y == 0.0f);
+  ASSERT (memcmp (&y, &zero, sizeof y) == 0);
+
   return 0;
 }