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authorRich Felker <dalias@aerifal.cx>2017-06-23 15:28:10 -0400
committerRich Felker <dalias@aerifal.cx>2017-06-23 15:28:10 -0400
commitce385fcfb2db74b109067083db4a26ca810eaa14 (patch)
treef759439c9cf1c25ea52f1488d6441dcb30b1b28d /src/math/s390x/roundl.c
parente6def544358afd5648a428d2e02c147a1f901048 (diff)
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s390x: add single-instruction math functions
these were introduced in z196 and not available in the baseline (z900)
ISA level. use __HTM__ as an alternate indicator for ISA level, since
gcc did not define __ARCH__ until 7.x.

patch by David Edelsohn.
Diffstat (limited to 'src/math/s390x/roundl.c')
-rw-r--r--src/math/s390x/roundl.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/math/s390x/roundl.c b/src/math/s390x/roundl.c
new file mode 100644
index 00000000..ce644ddd
--- /dev/null
+++ b/src/math/s390x/roundl.c
@@ -0,0 +1,15 @@
+#include <math.h>
+
+#if defined(__HTM__) || __ARCH__ >= 9
+
+long double roundl(long double x)
+{
+	__asm__ ("fixbra %0, 1, %1, 4" : "=f"(x) : "f"(x));
+	return x;
+}
+
+#else
+
+#include "../roundl.c"
+
+#endif