summaryrefslogtreecommitdiff
path: root/lib/ppc/DD.h
diff options
context:
space:
mode:
Diffstat (limited to 'lib/ppc/DD.h')
-rw-r--r--lib/ppc/DD.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/ppc/DD.h b/lib/ppc/DD.h
new file mode 100644
index 000000000..32acecd5f
--- /dev/null
+++ b/lib/ppc/DD.h
@@ -0,0 +1,46 @@
+#ifndef __DD_HEADER
+#define __DD_HEADER
+
+#include <stdint.h>
+
+typedef union {
+ long double ld;
+ struct {
+ double hi;
+ double lo;
+ };
+} DD;
+
+typedef union {
+ double d;
+ uint64_t x;
+} doublebits;
+
+#define LOWORDER(xy,xHi,xLo,yHi,yLo) \
+ (((((xHi)*(yHi) - (xy)) + (xHi)*(yLo)) + (xLo)*(yHi)) + (xLo)*(yLo))
+
+static inline double __attribute__((always_inline))
+fabs(double x)
+{
+ doublebits result = { .d = x };
+ result.x &= UINT64_C(0x7fffffffffffffff);
+ return result.d;
+}
+
+static inline double __attribute__((always_inline))
+high26bits(double x)
+{
+ doublebits result = { .d = x };
+ result.x &= UINT64_C(0xfffffffff8000000);
+ return result.d;
+}
+
+static inline int __attribute__((always_inline))
+different_sign(double x, double y)
+{
+ doublebits xsignbit = { .d = x }, ysignbit = { .d = y };
+ int result = (int)(xsignbit.x >> 63) ^ (int)(ysignbit.x >> 63);
+ return result;
+}
+
+#endif // __DD_HEADER