From 86c293bf54231dee13f45592a39a3f0d0cf19931 Mon Sep 17 00:00:00 2001
From: das <das@FreeBSD.org>
Date: Mon, 19 Jul 2004 08:17:25 +0000
Subject: Make FLT_ROUNDS correctly reflect the dynamic rounding mode.

---
 lib/libc/i386/gen/Makefile.inc |  2 +-
 lib/libc/i386/gen/flt_rounds.c | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 lib/libc/i386/gen/flt_rounds.c

(limited to 'lib/libc/i386/gen')

diff --git a/lib/libc/i386/gen/Makefile.inc b/lib/libc/i386/gen/Makefile.inc
index fcfc9ec..7776387 100644
--- a/lib/libc/i386/gen/Makefile.inc
+++ b/lib/libc/i386/gen/Makefile.inc
@@ -2,5 +2,5 @@
 # $FreeBSD$
 
 SRCS+=	_ctx_start.S _setjmp.S alloca.S fabs.S \
-	infinity.c ldexp.c makecontext.c modf.S \
+	flt_rounds.c infinity.c ldexp.c makecontext.c modf.S \
 	rfork_thread.S setjmp.S signalcontext.c sigsetjmp.S
diff --git a/lib/libc/i386/gen/flt_rounds.c b/lib/libc/i386/gen/flt_rounds.c
new file mode 100644
index 0000000..16417ff
--- /dev/null
+++ b/lib/libc/i386/gen/flt_rounds.c
@@ -0,0 +1,25 @@
+/*
+ * Written by J.T. Conklin, Apr 10, 1995
+ * Public domain.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <float.h>
+
+static const int map[] = {
+	1,	/* round to nearest */
+	3,	/* round to zero */
+	2,	/* round to negative infinity */
+	0	/* round to positive infinity */
+};
+
+int
+__flt_rounds(void)
+{
+	int x;
+
+	__asm("fnstcw %0" : "=m" (x));
+        return (map[(x >> 10) & 0x03]);
+}
-- 
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