svn commit: r219711 - head/contrib/gcc/config/i386

[Martin Matuska]

Author: mm
Date: Thu Mar 17 09:44:33 2011
New Revision: 219711
URL: http://svn.freebsd.org/changeset/base/219711

Log:
  Backport missing tunings for -march=core2:
  - enable extra 80387 mathematical constants (ext_80387_constants) [1]
  - enable compare and exchange 16 bytes (cmpxchg16b) [2]
  
  Verified against llvm-gcc (and apple gcc)
  
  Obtained from:	gcc-4.3 (ref. svn revs. 119260 [1], 121140 [2]; GPLv2)
  MFC after:	2 weeks

Modified:
  head/contrib/gcc/config/i386/i386.c

Modified: head/contrib/gcc/config/i386/i386.c
==============================================================================
--- head/contrib/gcc/config/i386/i386.c	Thu Mar 17 04:40:37 2011	(r219710)
+++ head/contrib/gcc/config/i386/i386.c	Thu Mar 17 09:44:33 2011	(r219711)
@@ -926,7 +926,7 @@ const int x86_use_incdec = ~(m_PENT4 | m
    integer data in xmm registers.  Which results in pretty abysmal code.  */
 const int x86_inter_unit_moves = 0 /* ~(m_ATHLON_K8) */;
 
-const int x86_ext_80387_constants = m_K6_GEODE | m_ATHLON | m_PENT4 | m_NOCONA | m_PPRO | m_GENERIC32;
+const int x86_ext_80387_constants = m_K6_GEODE | m_ATHLON | m_PENT4 | m_NOCONA | m_CORE2 | m_PPRO | m_GENERIC32;
 /* Some CPU cores are not able to predict more than 4 branch instructions in
    the 16 byte window.  */
 const int x86_four_jump_limit = m_PPRO | m_ATHLON_K8 | m_PENT4 | m_NOCONA | m_CORE2 | m_GENERIC;
@@ -937,7 +937,7 @@ const int x86_cmpxchg = ~m_386;
 /* Compare and exchange 8 bytes was added for pentium.  */
 const int x86_cmpxchg8b = ~(m_386 | m_486);
 /* Compare and exchange 16 bytes was added for nocona.  */
-const int x86_cmpxchg16b = m_NOCONA;
+const int x86_cmpxchg16b = m_NOCONA | m_CORE2;
 /* Exchange and add was added for 80486.  */
 const int x86_xadd = ~m_386;
 const int x86_pad_returns = m_ATHLON_K8 | m_CORE2 | m_GENERIC;