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-rw-r--r--src/internal/libm.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/internal/libm.h b/src/internal/libm.h
index 5669c046..09fcfde3 100644
--- a/src/internal/libm.h
+++ b/src/internal/libm.h
@@ -59,6 +59,23 @@ union ldshape {
#error Unsupported long double representation
#endif
+/* Evaluate an expression as the specified type. With standard excess
+ precision handling a type cast or assignment is enough (with
+ -ffloat-store an assignment is required, in old compilers argument
+ passing and return statement may not drop excess precision). */
+
+static inline float eval_as_float(float x)
+{
+ float y = x;
+ return y;
+}
+
+static inline double eval_as_double(double x)
+{
+ double y = x;
+ return y;
+}
+
/* fp_barrier returns its input, but limits code transformations
as if it had a side-effect (e.g. observable io) and returned
an arbitrary value. */