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;
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