Support for loongarch64 architecture (#280)

* Support for loongarch64 architecture

* fix compile error

Make.inc

@@ -84,6 +84,9 @@ endif
 ifeq ($(findstring riscv64,$(ARCH)),riscv64)
 override ARCH := riscv64
 endif
+ifeq ($(findstring loongarch64,$(ARCH)),loongarch64)
+override ARCH := loongarch64
+endif
 
 # If CFLAGS does not contain a -O optimization flag, default to -O3
 ifeq ($(findstring -O,$(CFLAGS)),)

Makefile

@@ -81,7 +81,7 @@ test/test-float: libopenlibm.$(OLM_MAJOR_MINOR_SHLIB_EXT)
 	$(MAKE) -C test test-float
 
 clean:
-	rm -f aarch64/*.o amd64/*.o arm/*.o bsdsrc/*.o i387/*.o ld80/*.o ld128/*.o src/*.o powerpc/*.o mips/*.o s390/*.o riscv64/*.o
+	rm -f aarch64/*.o amd64/*.o arm/*.o bsdsrc/*.o i387/*.o loongarch64/*.o ld80/*.o ld128/*.o src/*.o powerpc/*.o mips/*.o s390/*.o riscv64/*.o
 	rm -f libopenlibm.a libopenlibm.*$(SHLIB_EXT)*
 	$(MAKE) -C test clean
 

include/openlibm_fenv.h

@@ -16,6 +16,8 @@
 #include <openlibm_fenv_s390.h>
 #elif defined(__riscv)
 #include <openlibm_fenv_riscv.h>
+#elif defined(__loongarch64)
+#include <openlibm_fenv_loongarch64.h>
 #else
 #error "Unsupported platform"
 #endif

include/openlibm_fenv_loongarch64.h

@@ -0,0 +1,226 @@
+/*-
+ * Copyright (c) 2023 Yifan An <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef	_FENV_H_
+#define	_FENV_H_
+
+#include <stdint.h>
+#include "cdefs-compat.h"
+
+#ifndef	__fenv_static
+#define	__fenv_static	static
+#endif
+
+typedef	uint32_t	fenv_t;
+typedef	uint32_t	fexcept_t;
+
+/* Exception flags */
+#define	FE_INVALID	0x100000
+#define	FE_DIVBYZERO	0x080000
+#define	FE_OVERFLOW	0x040000
+#define	FE_UNDERFLOW	0x020000
+#define	FE_INEXACT	0x010000
+#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | \
+			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* Rounding modes */
+#define	FE_TONEAREST	0x0000
+#define	FE_TOWARDZERO	0x0100
+#define	FE_DOWNWARD	0x0200
+#define	FE_UPWARD	0x0300
+#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
+			 FE_UPWARD | FE_TOWARDZERO)
+
+__BEGIN_DECLS
+
+/* Default floating-point environment */
+extern const fenv_t	__fe_dfl_env;
+#define	FE_DFL_ENV	(&__fe_dfl_env)
+
+#define	_FPU_MASK_V	0x10
+#define	_FPU_MASK_Z	0x08
+#define	_FPU_MASK_O	0x04
+#define	_FPU_MASK_U	0x02
+#define	_FPU_MASK_I	0x01
+
+#define _FPUSW_SHIFT	16
+#define	_ENABLE_MASK	(_FPU_MASK_V | _FPU_MASK_Z | _FPU_MASK_O | _FPU_MASK_U | _FPU_MASK_I)
+
+#define __rfs(__fpsr)   __asm __volatile("movfcsr2gr %0,$r0" : "=r"(__fpsr))
+#define __wfs(__fpsr)   __asm __volatile("movgr2fcsr $r0,%0" : : "r"(__fpsr))
+
+__fenv_static inline int
+feclearexcept(int __excepts)
+{
+	fexcept_t __fpsr;
+
+	__rfs(__fpsr);
+	__fpsr &= ~__excepts;
+	__wfs(__fpsr);
+	return (0);
+}
+
+__fenv_static inline int
+fegetexceptflag(fexcept_t *__flagp, int __excepts)
+{
+	fexcept_t __fpsr;
+
+	__rfs(__fpsr);
+	*__flagp = __fpsr & __excepts;
+	return (0);
+}
+
+__fenv_static inline int
+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
+{
+	fexcept_t __fpsr;
+
+	__rfs(__fpsr);
+	__fpsr &= ~__excepts;
+	__fpsr |= *__flagp & __excepts;
+	__wfs(__fpsr);
+	return (0);
+}
+
+__fenv_static inline int
+feraiseexcept(int __excepts)
+{
+	fexcept_t __ex = __excepts;
+
+	fesetexceptflag(&__ex, __excepts);	/* XXX */
+	return (0);
+}
+
+__fenv_static inline int
+fetestexcept(int __excepts)
+{
+	fexcept_t __fpsr;
+
+	__rfs(__fpsr);
+	return (__fpsr & __excepts);
+}
+
+__fenv_static inline int
+fegetround(void)
+{
+	fexcept_t __fpsr;
+
+	__rfs(__fpsr);
+	return __fpsr & _ROUND_MASK;
+}
+
+__fenv_static inline int
+fesetround(int __round)
+{
+	fexcept_t __fpsr;
+	if ((__round & ~_ROUND_MASK) != 0)
+		return 1;
+
+	__rfs(__fpsr);
+	__fpsr &= ~_ROUND_MASK;
+	__fpsr |= __round;
+	__wfs(__fpsr);
+
+	return (0);
+}
+
+__fenv_static inline int
+fegetenv(fenv_t *__envp)
+{
+	__rfs(*__envp);
+	return (0);
+}
+
+__fenv_static inline int
+feholdexcept(fenv_t *__envp)
+{
+	fenv_t __env;
+
+	__rfs(__env);
+	*__envp = __env;
+	__env &= ~(FE_ALL_EXCEPT | _FPU_MASK_V | _FPU_MASK_Z | _FPU_MASK_O | _FPU_MASK_U | _FPU_MASK_I);
+	__wfs(__env);
+	return (0);
+}
+
+__fenv_static inline int
+fesetenv(const fenv_t *__envp)
+{
+	__wfs(*__envp);
+	return (0);
+}
+
+__fenv_static inline int
+feupdateenv(const fenv_t *__envp)
+{
+	fexcept_t __fpsr;
+
+	__rfs(__fpsr);
+	__wfs(*__envp);
+	feraiseexcept(__fpsr & FE_ALL_EXCEPT);
+	return (0);
+}
+
+#if __BSD_VISIBLE
+
+static inline int
+feenableexcept(int __mask)
+{
+	fenv_t __old_fpsr, __new_fpsr;
+
+	__rfs(__new_fpsr);
+	__old_fpsr = (__new_fpsr & _ENABLE_MASK) << _FPUSW_SHIFT;
+	__new_fpsr |= (__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT;
+	__wfs(__new_fpsr);
+	return __old_fpsr;
+}
+
+static inline int
+fedisableexcept(int __mask)
+{
+	fenv_t __old_fpsr, __new_fpsr;
+
+	__rfs(__new_fpsr);
+	__old_fpsr = (__new_fpsr & _ENABLE_MASK) << _FPUSW_SHIFT;
+	__new_fpsr &= ~((__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT);
+	__wfs(__new_fpsr);
+	return __old_fpsr;
+}
+
+static inline int
+fegetexcept(void)
+{
+	fenv_t __fpsr;
+
+	__rfs(__fpsr);
+	return ((__fpsr & _ENABLE_MASK) << _FPUSW_SHIFT);
+}
+
+#endif /* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif	/* !_FENV_H_ */

loongarch64/Make.files

@@ -0,0 +1 @@
+$(CUR_SRCS) = fenv.c

loongarch64/fenv.c

@@ -0,0 +1,27 @@
+#define	__fenv_static
+#include <fenv.h>
+
+#ifdef __GNUC_GNU_INLINE__
+#error "This file must be compiled with C99 'inline' semantics"
+#endif
+
+/*
+ * Hopefully the system ID byte is immutable, so it's valid to use
+ * this as a default environment.
+ */
+const fenv_t __fe_dfl_env = 0;
+
+extern inline int feclearexcept(int __excepts);
+extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
+extern inline int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
+extern inline int feraiseexcept(int __excepts);
+extern inline int fetestexcept(int __excepts);
+extern inline int fegetround(void);
+extern inline int fesetround(int __round);
+extern inline int fegetenv(fenv_t *__envp);
+extern inline int feholdexcept(fenv_t *__envp);
+extern inline int fesetenv(const fenv_t *__envp);
+extern inline int feupdateenv(const fenv_t *__envp);
+extern inline int feenableexcept(int __mask);
+extern inline int fedisableexcept(int __mask);
+extern inline int fegetexcept(void);

src/fpmath.h

@@ -45,6 +45,8 @@
 #include "s390_fpmath.h"
 #elif defined(__riscv)
 #include "riscv_fpmath.h"
+#elif defined(__loongarch64)
+#include "loongarch64_fpmath.h"
 #endif
 
 /* Definitions provided directly by GCC and Clang. */

src/loongarch64_fpmath.h

@@ -0,0 +1,56 @@
+/*-
+ * Copyright (c) 2023 Yifan An <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+
+union IEEEl2bits {
+	long double	e;
+	struct {
+		uint64_t	manl	:64;
+		uint64_t	manh	:48;
+		unsigned int	exp	:15;
+		unsigned int	sign	:1;
+	} bits;
+	struct {
+		uint64_t	manl	:64;
+		uint64_t	manh	:48;
+		unsigned int	expsign	:16;
+	} xbits;
+};
+
+#define	LDBL_NBIT	0
+#define	LDBL_IMPLICIT_NBIT
+#define	mask_nbit_l(u)	((void)0)
+
+#define	LDBL_MANH_SIZE	48
+#define	LDBL_MANL_SIZE	64
+
+#define	LDBL_TO_ARRAY32(u, a) do {			\
+	(a)[0] = (uint32_t)(u).bits.manl;		\
+	(a)[1] = (uint32_t)((u).bits.manl >> 32);	\
+	(a)[2] = (uint32_t)(u).bits.manh;		\
+	(a)[3] = (uint32_t)((u).bits.manh >> 32);	\
+} while(0)