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GNU C Library master sources branch, ibm/2.12/master, updated. glibc-2.12.1-27-gf302527


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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=f302527f2cb6d915fee932e08776990bab959578

commit f302527f2cb6d915fee932e08776990bab959578
Author: Michael Meissner <meissner@linux.vnet.ibm.com>
Date:   Tue Oct 19 12:49:05 2010 -0400

    Add C99 FP_FAST_FMA{,F,L} macros to math.h
    (cherry picked from commit d20501241ea423e477b357d93147530987e0d89e)

diff --git a/ChangeLog b/ChangeLog
index 5ad5234..4cfa3be 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2010-10-19  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	* bits/mathdef.h (FP_FAST_FMA): If the GCC 4.6 port has fast fma
+	builtins, define the macros in the C99 standard.
+	(FP_FAST_FMAF): Likewise.
+	(FP_FAST_FMAL): Likewise.
+	* sysdeps/powerpc/bits/mathdef.h (FP_FAST_FMA): Define, ppc as
+	multiply/add.
+	(FP_FAST_FMAF): Likewise.
+
 2010-10-15  Jakub Jelinek  <jakub@redhat.com>
 
 	[BZ #3268]
diff --git a/bits/mathdef.h b/bits/mathdef.h
index 00c6724..9734380 100644
--- a/bits/mathdef.h
+++ b/bits/mathdef.h
@@ -34,6 +34,20 @@ typedef double double_t;	/* `double' expressions are evaluated as
 # define FP_ILOGB0	(-2147483647)
 # define FP_ILOGBNAN	2147483647
 
+/* The GCC 4.6 compiler will define __FP_FAST_FMA{,F,L} if the fma{,f,l}
+   builtins are supported.  */
+#if __FP_FAST_FMA
+# define FP_FAST_FMA 1
+#endif
+
+#if __FP_FAST_FMAF
+# define FP_FAST_FMAF 1
+#endif
+
+#if __FP_FAST_FMAL
+# define FP_FAST_FMAL 1
+#endif
+
 #endif	/* ISO C99 */
 
 #ifndef __NO_LONG_DOUBLE_MATH
diff --git a/sysdeps/powerpc/bits/mathdef.h b/sysdeps/powerpc/bits/mathdef.h
index b79cc6f..0c99248 100644
--- a/sysdeps/powerpc/bits/mathdef.h
+++ b/sysdeps/powerpc/bits/mathdef.h
@@ -61,4 +61,8 @@ typedef double double_t;
 # define FP_ILOGB0	(-2147483647)
 # define FP_ILOGBNAN	(2147483647)
 
+/* The powerpc has a combined multiply/add instruction.  */
+# define FP_FAST_FMA 1
+# define FP_FAST_FMAF 1
+
 #endif	/* ISO C99 */

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                      |   10 ++++++++++
 bits/mathdef.h                 |   14 ++++++++++++++
 sysdeps/powerpc/bits/mathdef.h |    4 ++++
 3 files changed, 28 insertions(+), 0 deletions(-)


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