[4.8, PATCH 12/26] Backport Power8 and LE support: Defaults

[Bill Schmidt]

Hi,

This patch (diff-le-align) sets some miscellaneous defaults for little
endian support.

Thanks,
Bill


2014-03-29  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

        Apply mainline r205060.
        2013-11-20  Alan Modra  <amo...@gmail.com>
        * config/rs6000/sysv4.h (CC1_ENDIAN_LITTLE_SPEC): Define as empty.
        * config/rs6000/rs6000.c (rs6000_option_override_internal): Default
        to strict alignment on older processors when little-endian.
        * config/rs6000/linux64.h (PROCESSOR_DEFAULT64): Default to power8
        for ELFv2.


Index: gcc-4_8-branch/gcc/config/rs6000/linux64.h
===================================================================
--- gcc-4_8-branch.orig/gcc/config/rs6000/linux64.h     2013-12-28 
17:50:44.252360594 +0100
+++ gcc-4_8-branch/gcc/config/rs6000/linux64.h  2013-12-28 17:50:46.356371060 
+0100
@@ -71,7 +71,11 @@ extern int dot_symbols;
 #undef  PROCESSOR_DEFAULT
 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
 #undef  PROCESSOR_DEFAULT64
+#ifdef LINUX64_DEFAULT_ABI_ELFv2
+#define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
+#else
 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
+#endif
 
 /* We don't need to generate entries in .fixup, except when
    -mrelocatable or -mrelocatable-lib is given.  */
Index: gcc-4_8-branch/gcc/config/rs6000/rs6000.c
===================================================================
--- gcc-4_8-branch.orig/gcc/config/rs6000/rs6000.c      2013-12-28 
17:50:44.219360429 +0100
+++ gcc-4_8-branch/gcc/config/rs6000/rs6000.c   2013-12-28 17:50:46.369371125 
+0100
@@ -3206,6 +3206,12 @@ rs6000_option_override_internal (bool gl
        }
     }
 
+  /* If little-endian, default to -mstrict-align on older processors.
+     Testing for htm matches power8 and later.  */
+  if (!BYTES_BIG_ENDIAN
+      && !(processor_target_table[tune_index].target_enable & OPTION_MASK_HTM))
+    rs6000_isa_flags |= ~rs6000_isa_flags_explicit & OPTION_MASK_STRICT_ALIGN;
+
   /* Add some warnings for VSX.  */
   if (TARGET_VSX)
     {
Index: gcc-4_8-branch/gcc/config/rs6000/sysv4.h
===================================================================
--- gcc-4_8-branch.orig/gcc/config/rs6000/sysv4.h       2013-12-28 
17:50:44.243360549 +0100
+++ gcc-4_8-branch/gcc/config/rs6000/sysv4.h    2013-12-28 17:50:46.374371150 
+0100
@@ -538,12 +538,7 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEF
 
 #define        CC1_ENDIAN_BIG_SPEC ""
 
-#define        CC1_ENDIAN_LITTLE_SPEC "\
-%{!mstrict-align: %{!mno-strict-align: \
-    %{!mcall-i960-old: \
-       -mstrict-align \
-    } \
-}}"
+#define        CC1_ENDIAN_LITTLE_SPEC ""
 
 #define        CC1_ENDIAN_DEFAULT_SPEC "%(cc1_endian_big)"