1 files changed, 137 insertions, 0 deletions
diff --git a/src/internal/longdbl.h b/src/internal/longdbl.h
new file mode 100644
index 00000000..25ec8021
--- /dev/null
+++ b/src/internal/longdbl.h
@@ -0,0 +1,137 @@
+#ifndef _LDHACK_H
+#define _LDHACK_H
+
+#include <float.h>
+#include <stdint.h>
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
+union ldshape {
+	long double value;
+	struct {
+		uint64_t m;
+		uint16_t exp:15;
+		uint16_t sign:1;
+		uint16_t pad;
+	} bits;
+};
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+union ldshape {
+	long double value;
+	struct {
+		uint64_t mlo;
+		uint64_t mhi:48;
+		uint16_t exp:15;
+		uint16_t sign:1;
+	} bits;
+};
+#else
+#error Unsupported long double representation
+#endif
+
+
+// FIXME: hacks to make freebsd+openbsd long double code happy
+
+// union and macros for freebsd
+
+#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
+
+union IEEEl2bits {
+	long double e;
+	struct {
+		uint32_t manl:32;
+		uint32_t manh:32;
+		uint32_t exp:15;
+		uint32_t sign:1;
+		uint32_t pad:16;
+	} bits;
+	struct {
+		uint64_t man:64;
+		uint32_t expsign:16;
+		uint32_t pad:16;
+	} xbits;
+};
+
+#define LDBL_MANL_SIZE 32
+#define LDBL_MANH_SIZE 32
+#define LDBL_NBIT (1ull << LDBL_MANH_SIZE-1)
+#undef LDBL_IMPLICIT_NBIT
+#define mask_nbit_l(u) ((u).bits.manh &= ~LDBL_NBIT)
+
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+/*
+// ld128 float.h
+//#define LDBL_MAX 1.189731495357231765085759326628007016E+4932L
+#define LDBL_MAX 0x1.ffffffffffffffffffffffffffffp+16383
+#define LDBL_MAX_EXP 16384
+#define LDBL_HAS_INFINITY 1
+//#define LDBL_MIN 3.362103143112093506262677817321752603E-4932L
+#define LDBL_MIN 0x1p-16382
+#define LDBL_HAS_QUIET_NAN 1
+#define LDBL_HAS_DENORM 1
+//#define LDBL_EPSILON 1.925929944387235853055977942584927319E-34L
+#define LDBL_EPSILON 0x1p-112
+#define LDBL_MANT_DIG 113
+#define LDBL_MIN_EXP (-16381)
+#define LDBL_MAX_10_EXP 4932
+#define LDBL_DENORM_MIN 0x0.0000000000000000000000000001p-16381
+#define LDBL_MIN_10_EXP (-4931)
+#define LDBL_DIG 33
+*/
+
+union IEEEl2bits {
+	long double e;
+	struct {
+		uint64_t manl:64;
+		uint64_t manh:48;
+		uint32_t exp:15;
+		uint32_t sign:1;
+	} bits;
+	struct {
+		uint64_t unused0:64;
+		uint64_t unused1:48;
+		uint32_t expsign:16;
+	} xbits;
+};
+
+#define LDBL_MANL_SIZE 64
+#define LDBL_MANH_SIZE 48
+#define LDBL_NBIT (1ull << LDBL_MANH_SIZE)
+#define LDBL_IMPLICIT_NBIT 1
+#define mask_nbit_l(u)
+
+#endif
+
+
+// macros for openbsd
+
+#define GET_LDOUBLE_WORDS(se,mh,ml, f) do{ \
+	union IEEEl2bits u; \
+	u.e = (f); \
+	(se) = u.xbits.expsign; \
+	(mh) = u.bits.manh; \
+	(ml) = u.bits.manl; \
+}while(0)
+
+#define SET_LDOUBLE_WORDS(f,  se,mh,ml) do{ \
+	union IEEEl2bits u; \
+	u.xbits.expsign = (se); \
+	u.bits.manh = (mh); \
+	u.bits.manl = (ml); \
+	(f) = u.e; \
+}while(0)
+
+#define GET_LDOUBLE_EXP(se, f) do{ \
+	union IEEEl2bits u; \
+	u.e = (f); \
+	(se) = u.xbits.expsign; \
+}while(0)
+
+#define SET_LDOUBLE_EXP(f, se) do{ \
+	union IEEEl2bits u; \
+	u.e = (f); \
+	u.xbits.expsign = (se); \
+	(f) = u.e; \
+}while(0)
+
+#endif