From: Ulrich Drepper <drepper@redhat.com>
Date: Mon, 24 Aug 2009 21:52:49 +0000 (-0700)
Subject: Optimize float construction/extraction on x86-64.
X-Git-Tag: fedora/glibc-2.10.90-16~1^2~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9a1ea1525eb8e02ce20eb93d65dc880186731bf7;p=thirdparty%2Fglibc.git

Optimize float construction/extraction on x86-64.
---

diff --git a/ChangeLog b/ChangeLog
index bc1c0f17a96..c29660d6525 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-08-24  Ulrich Drepper  <drepper@redhat.com>
+
+	* sysdeps/x86_64/fpu/math_private.h: Add specialized GET_FLOAT_WORD
+	and SET_FLOAT_WORD definitions.
+
 2009-08-24  Roland McGrath  <roland@redhat.com>
 
 	* sysdeps/unix/syscall-template.S: New file.
diff --git a/sysdeps/x86_64/fpu/math_private.h b/sysdeps/x86_64/fpu/math_private.h
index 4febcbb5ec9..8f4b792e776 100644
--- a/sysdeps/x86_64/fpu/math_private.h
+++ b/sysdeps/x86_64/fpu/math_private.h
@@ -18,4 +18,24 @@ do							\
 while (0)
 
 #include <math/math_private.h>
+
+/* We can do a few things better on x86-64.  */
+
+/* Direct movement of float into integer register.  */
+#undef GET_FLOAT_WORD
+#define GET_FLOAT_WORD(i,d) \
+do {								\
+  int i_;							\
+  asm ("movd %1, %0" : "=rm" (i_) : "x" (d));			\
+  (i) = i_;							\
+} while (0)
+
+/* And the reverse.  */
+#undef SET_FLOAT_WORD
+#define SET_FLOAT_WORD(d,i) \
+do {								\
+  int i_ = i;							\
+  asm ("movd %1, %0" : "=x" (d) : "rm" (i_));			\
+} while (0)
+
 #endif