[PATCH] Make ieee754 fma tolerate architectures without exception support.

[Chris Metcalf]

2012-11-05  Chris Metcalf  <cmetcalf@tilera.com>

	* sysdeps/ieee754/dbl-64/s_fma.c [!defined FE_INEXACT]:
	Provide no-op defines for exception and rounding macros.

---
 ChangeLog                      |    5 +++++
 sysdeps/ieee754/dbl-64/s_fma.c |   11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 3ff6937..a44ff1a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-05  Chris Metcalf  <cmetcalf@tilera.com>
+
+	* sysdeps/ieee754/dbl-64/s_fma.c [!defined FE_INEXACT]:
+	Provide no-op defines for exception and rounding macros.
+
 2012-11-05  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #14805]
diff --git a/sysdeps/ieee754/dbl-64/s_fma.c b/sysdeps/ieee754/dbl-64/s_fma.c
index cd28830..6ceb925 100644
--- a/sysdeps/ieee754/dbl-64/s_fma.c
+++ b/sysdeps/ieee754/dbl-64/s_fma.c
@@ -28,6 +28,17 @@
    double rounding.  See a paper by Boldo and Melquiond:
    http://www.lri.fr/~melquion/doc/08-tc.pdf  */
 
+/* For IEEE754 architectures without exception support, tolerate imprecision
+   in __fma but allow using this implementation instead of the generic one.
+   Use statement expressions to avoid "statement with no effect" warnings.  */
+#ifndef FE_INEXACT
+# define libc_feholdexcept_setround(env, exc)	({ (void) (env); 0; })
+# define libc_feupdateenv_test(env, exc)	({ (void) (env); 0; })
+# define libc_fesetround(rnd)			({ 0; })
+# define libc_fetestexcept(exc)			({ 0; })
+# define feclearexcept(exc)			({ 0; })
+#endif
+
 double
 __fma (double x, double y, double z)
 {
-- 
1.7.10.3