crosstool-ng: patches/gcc/4.2.4/260-flatten-switch-stmt-00.patch@268544004e77

On 20090131.1659+0100, Vincent Sanders <vince@kyllikki.org> wrote:
[This]patch is a bit more involved. The patch addresses a gcc
regression in the 4.3 series (specifically this patch is against 4.3.2
which does *not* have a lot of other issues which affect kernel building)

GCC bug tracker has this issue as
#38453 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38453
#32044 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32044

comment 65 of #32044 has the fix being applied to gcc trunk as revision #142719

The attached patch is a backport to gcc 4.3.2 which allows this
version to be used to generate correct output for various ARM kernel
build (and indeed is teh correct answer in general).

/trunk/patches/gcc/4.3.2/360-fix-expensive-optimize.patch | 207 207 0 0 +++++++++++++++++++++
1 file changed, 207 insertions(+)

     1 diff -durN gcc-4.2.1.orig/gcc/stmt.c gcc-4.2.1/gcc/stmt.c

     2 --- gcc-4.2.1.orig/gcc/stmt.c	2007-07-19 05:25:32.000000000 +0200

     3 +++ gcc-4.2.1/gcc/stmt.c	2007-08-03 20:37:19.000000000 +0200

     4 @@ -2512,7 +2512,11 @@

     5  	  use_cost_table

     6  	    = (TREE_CODE (orig_type) != ENUMERAL_TYPE

     7  	       && estimate_case_costs (case_list));

     8 -	  balance_case_nodes (&case_list, NULL);

     9 +	  /* When optimizing for size, we want a straight list to avoid

    10 +	     jumps as much as possible. This basically creates an if-else

    11 +	     chain.  */

    12 +	  if (!optimize_size)

    13 +	    balance_case_nodes (&case_list, NULL);

    14  	  emit_case_nodes (index, case_list, default_label, index_type);

    15  	  emit_jump (default_label);

    16  	}

    17 @@ -3070,6 +3074,7 @@

    18  	    {

    19  	      if (!node_has_low_bound (node, index_type))

    20  		{

    21 +		  if (!optimize_size) /* don't jl to the .default_label. */

    22  		  emit_cmp_and_jump_insns (index,

    23  					   convert_modes

    24  					   (mode, imode,

author	"Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
	Sat Jan 31 17:49:27 2009 +0000 (2009-01-31)
changeset 1183	268544004e77
parent 687	b2b6b1d46aa1
permissions	-rw-r--r--