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--- modules/fdlibm/src/math_private.h.orig 2021-09-30 19:32:33.764224000 +0200
+++ modules/fdlibm/src/math_private.h 2021-10-02 22:15:33.265122000 +0200
@@ -30,7 +30,11 @@
* Adapted from https://github.com/freebsd/freebsd-src/search?q=__double_t
*/
-typedef double __double_t;
+#ifdef __LP64__
+typedef double __double_t;
+#else
+typedef long double __double_t;
+#endif
typedef __double_t double_t;
/*
@@ -630,7 +634,37 @@
return ((double)(x + 0x1.8p52) - 0x1.8p52);
}
+static inline float
+rnintf(__float_t x)
+{
+ /*
+ * As for rnint(), except we could just call that to handle the
+ * extra precision case, usually without losing efficiency.
+ */
+ return ((float)(x + 0x1.8p23F) - 0x1.8p23F);
+}
+
+#ifdef LDBL_MANT_DIG
/*
+ * The complications for extra precision are smaller for rnintl() since it
+ * can safely assume that the rounding precision has been increased from
+ * its default to FP_PE on x86. We don't exploit that here to get small
+ * optimizations from limiting the rangle to double. We just need it for
+ * the magic number to work with long doubles. ld128 callers should use
+ * rnint() instead of this if possible. ld80 callers should prefer
+ * rnintl() since for amd64 this avoids swapping the register set, while
+ * for i386 it makes no difference (assuming FP_PE), and for other arches
+ * it makes little difference.
+ */
+static inline long double
+rnintl(long double x)
+{
+ return (x + __CONCAT(0x1.8p, LDBL_MANT_DIG) / 2 -
+ __CONCAT(0x1.8p, LDBL_MANT_DIG) / 2);
+}
+#endif /* LDBL_MANT_DIG */
+
+/*
* irint() and i64rint() give the same result as casting to their integer
* return type provided their arg is a floating point integer. They can
* sometimes be more efficient because no rounding is required.
@@ -644,6 +678,39 @@
sizeof(x) == sizeof(long double) ? irintl(x) : (int)(x))
#else
#define irint(x) ((int)(x))
+#endif
+
+#define i64rint(x) ((int64_t)(x)) /* only needed for ld128 so not opt. */
+
+#if defined(__i386__) && defined(__GNUCLIKE_ASM)
+static __inline int
+irintf(float x)
+{
+ int n;
+
+ __asm("fistl %0" : "=m" (n) : "t" (x));
+ return (n);
+}
+
+static __inline int
+irintd(double x)
+{
+ int n;
+
+ __asm("fistl %0" : "=m" (n) : "t" (x));
+ return (n);
+}
+#endif
+
+#if (defined(__amd64__) || defined(__i386__)) && defined(__GNUCLIKE_ASM)
+static __inline int
+irintl(long double x)
+{
+ int n;
+
+ __asm("fistl %0" : "=m" (n) : "t" (x));
+ return (n);
+}
#endif
#ifdef DEBUG
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