C version of fabs(), for now

turns out same as a diff drahn didn't commit
ok kettenis

2 files changed, 37 insertions, 2 deletions

diff --git a/lib/libc/arch/riscv64/gen/Makefile.inc b/lib/libc/arch/riscv64/gen/Makefile.inc
index 7bbb5508478..e251b496848 100644
--- a/lib/libc/arch/riscv64/gen/Makefile.inc
+++ b/lib/libc/arch/riscv64/gen/Makefile.inc
@@ -1,10 +1,10 @@
-# $OpenBSD: Makefile.inc,v 1.1 2021/04/29 18:37:19 drahn Exp $
+# $OpenBSD: Makefile.inc,v 1.2 2021/06/19 18:43:28 deraadt Exp $
 SRCS+=	ldexp.c
 SRCS+=	infinity.c modf.c nan.c
 SRCS+=	flt_rounds.c
 SRCS+=	fpclassifyl.c
 SRCS+=	fpgetmask.c fpgetround.c fpgetsticky.c
 SRCS+=	fpsetmask.c fpsetround.c fpsetsticky.c
-SRCS+=	usertc.c
+SRCS+=	fabs.c usertc.c
 SRCS+=	setjmp.S _setjmp.S sigsetjmp.S
 SRCS+=	isnanl.c signbitl.c isfinitel.c isinfl.c isnormall.c
diff --git a/lib/libc/arch/riscv64/gen/fabs.c b/lib/libc/arch/riscv64/gen/fabs.c
new file mode 100644
index 00000000000..dcd2532cecd
--- /dev/null
+++ b/lib/libc/arch/riscv64/gen/fabs.c
@@ -0,0 +1,35 @@
+/*	$OpenBSD: fabs.c,v 1.1 2021/06/19 18:43:28 deraadt Exp $	*/
+/*
+ * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <machine/ieee.h>
+#include <math.h>
+
+/*
+ * fabs(d) returns the absolute value of d.
+ */
+double
+fabs(double d)
+{
+	struct ieee_double *p = (struct ieee_double *)&d;
+
+	p->dbl_sign = 0;
+
+	return(d);
+}
+
+__strong_alias(fabsl, fabs);