From: Alexander Monakov <amonakov@ispras.ru>
Date: Mon, 6 Jan 2020 17:31:47 +0000 (+0300)
Subject: math: move i386 sqrtf to C with inline asm
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=29adaeb2c0e795e75044a9b678b8cc66570f7e95;p=oweals%2Fmusl.git

math: move i386 sqrtf to C with inline asm
---

diff --git a/src/math/i386/sqrtf.c b/src/math/i386/sqrtf.c
new file mode 100644
index 00000000..41c65c2b
--- /dev/null
+++ b/src/math/i386/sqrtf.c
@@ -0,0 +1,12 @@
+#include <math.h>
+
+float sqrtf(float x)
+{
+	long double t;
+	/* The long double result has sufficient precision so that
+	 * second rounding to float still keeps the returned value
+	 * correctly rounded, see Pierre Roux, "Innocuous Double
+	 * Rounding of Basic Arithmetic Operations". */
+	__asm__ ("fsqrt" : "=t"(t) : "0"(x));
+	return (float)t;
+}
diff --git a/src/math/i386/sqrtf.s b/src/math/i386/sqrtf.s
deleted file mode 100644
index 9e944f45..00000000
--- a/src/math/i386/sqrtf.s
+++ /dev/null
@@ -1,7 +0,0 @@
-.global sqrtf
-.type sqrtf,@function
-sqrtf:	flds 4(%esp)
-	fsqrt
-	fstps 4(%esp)
-	flds 4(%esp)
-	ret