From b173e4262f65800ea488b4494125284779a61547 Mon Sep 17 00:00:00 2001
From: Alexander Monakov <amonakov@ispras.ru>
Date: Tue, 14 Jan 2020 23:36:44 +0300
Subject: math: move x87-family remainder functions to C with inline asm

---
 src/math/i386/remainder.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 src/math/i386/remainder.c

(limited to 'src/math/i386/remainder.c')

diff --git a/src/math/i386/remainder.c b/src/math/i386/remainder.c
new file mode 100644
index 00000000..c083df90
--- /dev/null
+++ b/src/math/i386/remainder.c
@@ -0,0 +1,12 @@
+#include <math.h>
+
+double remainder(double x, double y)
+{
+	unsigned short fpsr;
+	// fprem1 does not introduce excess precision into x
+	do __asm__ ("fprem1; fnstsw %%ax" : "+t"(x), "=a"(fpsr) : "u"(y));
+	while (fpsr & 0x400);
+	return x;
+}
+
+weak_alias(remainder, drem);
-- 
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