Check for 64 FP instructions availability in libm before using them

Currently, double precision math functions in newlib/libm/machine/arm detect whether neon instructions can be used for double precision computation by checking the architecture version (>= 8) and the availability of floating-point instructions. However, these instructions would not be available if targeting fpv5-sp-d16 as the FPU, which by definition does not have 64bit float instructions. This patch adds a check that __ARM_FP advertises 64bit float instructions.

        * libm/machine/arm/s_ceil.c: Also check that 64bit FP instructions are
        available in the guard.
        * libm/machine/arm/s_floor.c: Likewise.
        * libm/machine/arm/s_nearbyint.c: Likewise.
        * libm/machine/arm/s_rint.c: Likewise.
        * libm/machine/arm/s_round.c: Likewise.
        * libm/machine/arm/s_trunc.c: Likewise.

7 files changed, 16 insertions, 6 deletions

diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index de5c84b21..1524b9923 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,13 @@
+2015-12-09  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* libm/machine/arm/s_ceil.c: Also check that 64bit FP instructions are
+	available in the guard.
+	* libm/machine/arm/s_floor.c: Likewise.
+	* libm/machine/arm/s_nearbyint.c: Likewise.
+	* libm/machine/arm/s_rint.c: Likewise.
+	* libm/machine/arm/s_round.c: Likewise.
+	* libm/machine/arm/s_trunc.c: Likewise.
+
 2015-12-08  Corinna Vinschen  <corinna@vinschen.de>
 
 	* libc/stdio/fclose.c (_fclose_r): Make _flockfile/_funlockfile calls
diff --git a/newlib/libm/machine/arm/s_ceil.c b/newlib/libm/machine/arm/s_ceil.c
index ceb5bbfb0..ed1e85a3c 100644
--- a/newlib/libm/machine/arm/s_ceil.c
+++ b/newlib/libm/machine/arm/s_ceil.c
@@ -24,7 +24,7 @@
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-#if __ARM_ARCH >= 8 && !defined (__SOFTFP__)
+#if __ARM_ARCH >= 8 && (__ARM_FP & 0x8) && !defined (__SOFTFP__)
 #include <math.h>
 
 double
diff --git a/newlib/libm/machine/arm/s_floor.c b/newlib/libm/machine/arm/s_floor.c
index 50019819c..d25132f0d 100644
--- a/newlib/libm/machine/arm/s_floor.c
+++ b/newlib/libm/machine/arm/s_floor.c
@@ -24,7 +24,7 @@
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-#if __ARM_ARCH >= 8 && !defined (__SOFTFP__)
+#if __ARM_ARCH >= 8 && (__ARM_FP & 0x8) && !defined (__SOFTFP__)
 #include <math.h>
 
 double
diff --git a/newlib/libm/machine/arm/s_nearbyint.c b/newlib/libm/machine/arm/s_nearbyint.c
index c3b50dc7b..7ead69b12 100644
--- a/newlib/libm/machine/arm/s_nearbyint.c
+++ b/newlib/libm/machine/arm/s_nearbyint.c
@@ -24,7 +24,7 @@
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-#if __ARM_ARCH >= 8 && !defined (__SOFTFP__)
+#if __ARM_ARCH >= 8 && (__ARM_FP & 0x8) && !defined (__SOFTFP__)
 #include <math.h>
 
 double
diff --git a/newlib/libm/machine/arm/s_rint.c b/newlib/libm/machine/arm/s_rint.c
index 9050424a7..02c102250 100644
--- a/newlib/libm/machine/arm/s_rint.c
+++ b/newlib/libm/machine/arm/s_rint.c
@@ -24,7 +24,7 @@
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-#if __ARM_ARCH >= 8 && !defined (__SOFTFP__)
+#if __ARM_ARCH >= 8 && (__ARM_FP & 0x8) && !defined (__SOFTFP__)
 #include <math.h>
 
 double
diff --git a/newlib/libm/machine/arm/s_round.c b/newlib/libm/machine/arm/s_round.c
index 97f0296c6..a8f246602 100644
--- a/newlib/libm/machine/arm/s_round.c
+++ b/newlib/libm/machine/arm/s_round.c
@@ -24,7 +24,7 @@
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-#if __ARM_ARCH >= 8 && !defined (__SOFTFP__)
+#if __ARM_ARCH >= 8 && (__ARM_FP & 0x8) && !defined (__SOFTFP__)
 #include <math.h>
 
 double
diff --git a/newlib/libm/machine/arm/s_trunc.c b/newlib/libm/machine/arm/s_trunc.c
index 2f38a3574..6fb696814 100644
--- a/newlib/libm/machine/arm/s_trunc.c
+++ b/newlib/libm/machine/arm/s_trunc.c
@@ -24,7 +24,7 @@
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-#if __ARM_ARCH >= 8 && !defined (__SOFTFP__)
+#if __ARM_ARCH >= 8 && (__ARM_FP & 0x8) && !defined (__SOFTFP__)
 #include <math.h>
 
 double