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Re: [PATCH] PPC64 Use hardware sqrt.


I do not think its fair to say that all future PPC64 processors will implement the fsqrt instruction.

- kumar

On Apr 29, 2004, at 11:16 AM, Steve Munroe wrote:

w_sqrt and w_sqrtf coded in assembler to take advantage of the "optional instruction" fsqrt, which is implememented for all PPC64 processors.

2004-04-29 Steven Munroe <sjmunroe@us.ibm.com>
* sysdeps/powerpc/powerpc64/fpu/w_sqrt.S: New file.
* sysdeps/powerpc/powerpc64/fpu/w_sqrtf.S: New file.
diff -urN libc23-cvstip-20040412/sysdeps/powerpc/powerpc64/fpu/w_sqrt.S libc23/sysdeps/powerpc/powerpc64/fpu/w_sqrt.S
--- libc23-cvstip-20040412/sysdeps/powerpc/powerpc64/fpu/w_sqrt.S Wed Dec 31 17:00:00 1969
+++ libc23/sysdeps/powerpc/powerpc64/fpu/w_sqrt.S Fri Apr 23 15:01:21 2004
@@ -0,0 +1,39 @@
+/* Double square root. PowerPC64 version.
+ Copyright (C) 2004 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
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* This has been coded in assembler to take advantage of the "optional
+ instruction" fsqrt, which is implememented for all PPC64 processors. */
+
+#include <sysdep.h>
+
+ENTRY(__sqrt)
+ fsqrt fp1,fp1
+ blr
+ END (__sqrt)
+
+weak_alias(__sqrt,sqrt)
+
+/* Strictly, this is wrong, but the only places where _ieee754_sqrt is
+ used will not pass in a negative result. */
+strong_alias(__sqrt,__ieee754_sqrt)
+
+#ifdef NO_LONG_DOUBLE
+weak_alias(__sqrt,sqrtl)
+strong_alias(__sqrt,__sqrtl)
+#endif
diff -urN libc23-cvstip-20040412/sysdeps/powerpc/powerpc64/fpu/w_sqrtf.S libc23/sysdeps/powerpc/powerpc64/fpu/w_sqrtf.S
--- libc23-cvstip-20040412/sysdeps/powerpc/powerpc64/fpu/w_sqrtf.S Wed Dec 31 17:00:00 1969
+++ libc23/sysdeps/powerpc/powerpc64/fpu/w_sqrtf.S Fri Apr 23 15:02:29 2004
@@ -0,0 +1,35 @@
+/* Float square root. PowerPC64 version.
+ Copyright (C) 2004 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
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* This has been coded in assembler to take advantage of the "optional
+ instruction" fsqrts, which is implememented for all PPC64 processors. */
+
+#include <sysdep.h>
+
+ENTRY(__sqrtf)
+ fsqrts fp1,fp1
+ blr
+ END (__sqrtf)
+
+weak_alias(__sqrtf,sqrtf)
+
+/* Strictly, this is wrong, but the only places where _ieee754_sqrt is
+ used will not pass in a negative result. */
+strong_alias(__sqrtf,__ieee754_sqrtf)
+


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