From 268f6dda11e8afc861cbd964b2f209eb0ff816a3 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Wed, 30 May 2012 15:49:01 -0700
Subject: [PATCH] alpha: Use dynamic rounding with sqrt insn

---
 ChangeLog.alpha                      |  5 +++++
 sysdeps/alpha/alphaev6/fpu/e_sqrt.S  |  6 +++---
 sysdeps/alpha/alphaev6/fpu/e_sqrtf.S |  6 +++---
 sysdeps/alpha/fpu/math_private.h     | 26 ++++++++++++++++++++++++++
 4 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/ChangeLog.alpha b/ChangeLog.alpha
index f87c9d69be..44ffdc74e3 100644
--- a/ChangeLog.alpha
+++ b/ChangeLog.alpha
@@ -1,5 +1,10 @@
 2012-05-30  Richard Henderson  <rth@twiddle.net>
 
+	* sysdeps/alpha/alphaev6/fpu/e_sqrt.S: Use dynamic rounding.
+	* sysdeps/alpha/alphaev6/fpu/e_sqrtf.S: Likewise.
+	* sysdeps/alpha/fpu/math_private.h (__ieee754_sqrt): New.
+	(__ieee754_sqrtf): New.
+
 	* sysdeps/unix/sysv/linux/alpha/nptl/pthread_once.c: Replace
 	_internal alias by hidden_def.
 
diff --git a/sysdeps/alpha/alphaev6/fpu/e_sqrt.S b/sysdeps/alpha/alphaev6/fpu/e_sqrt.S
index eae1fb4e4c..c4625d0eca 100644
--- a/sysdeps/alpha/alphaev6/fpu/e_sqrt.S
+++ b/sysdeps/alpha/alphaev6/fpu/e_sqrt.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000 Free Software Foundation, Inc.
+/* Copyright (C) 2000-2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -33,9 +33,9 @@ ENTRY(__ieee754_sqrt)
 
 	.align 4
 #ifdef _IEEE_FP_INEXACT
-	sqrtt/sui $f16, $f0
+	sqrtt/suid $f16, $f0
 #else
-	sqrtt/su $f16, $f0
+	sqrtt/sud $f16, $f0
 #endif
 	ret
 	nop
diff --git a/sysdeps/alpha/alphaev6/fpu/e_sqrtf.S b/sysdeps/alpha/alphaev6/fpu/e_sqrtf.S
index c8217e5454..5681f3a947 100644
--- a/sysdeps/alpha/alphaev6/fpu/e_sqrtf.S
+++ b/sysdeps/alpha/alphaev6/fpu/e_sqrtf.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000 Free Software Foundation, Inc.
+/* Copyright (C) 2000-2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -33,9 +33,9 @@ ENTRY(__ieee754_sqrtf)
 
 	.align 4
 #ifdef _IEEE_FP_INEXACT
-	sqrts/sui $f16, $f0
+	sqrts/suid $f16, $f0
 #else
-	sqrts/su $f16, $f0
+	sqrts/sud $f16, $f0
 #endif
 	ret
 	nop
diff --git a/sysdeps/alpha/fpu/math_private.h b/sysdeps/alpha/fpu/math_private.h
index eb2177d78d..4f270f7a3f 100644
--- a/sysdeps/alpha/fpu/math_private.h
+++ b/sysdeps/alpha/fpu/math_private.h
@@ -18,4 +18,30 @@
 
 #include_next <math_private.h>
 
+#ifdef __alpha_fix__
+extern __always_inline double
+__ieee754_sqrt (double d)
+{
+  double ret;
+# ifdef _IEEE_FP_INEXACT
+  asm ("sqrtt/suid %1,%0" : "=f"(ret) : "f"(d));
+# else
+  asm ("sqrtt/sud %1,%0" : "=f"(ret) : "f"(d));
+# endif
+  return ret;
+}
+
+extern __always_inline float
+__ieee754_sqrtf (float d)
+{
+  float ret;
+# ifdef _IEEE_FP_INEXACT
+  asm ("sqrts/suid %1,%0" : "=f"(ret) : "f"(d));
+# else
+  asm ("sqrts/sud %1,%0" : "=f"(ret) : "f"(d));
+# endif
+  return ret;
+}
+#endif /* FIX */
+
 #endif /* ALPHA_MATH_PRIVATE_H */