patches/gcc/4.3.2/160-flatten-switch-stmt-00.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Mon Feb 02 22:00:18 2009 +0000 (2009-02-02)
changeset 1201 c9967a6e3b25
parent 747 d3e603e7c17c
permissions -rw-r--r--
Add a patchset for glibc 2_9. Vampirised from the gentoo repository.

/trunk/patches/glibc/2_9/500-ppc-glibc-2.9-atomic.patch | 414 414 0 0 ++++++++++
/trunk/patches/glibc/2_9/140-regex-BZ9697.patch | 111 111 0 0 +++
/trunk/patches/glibc/2_9/190-queue-header-updates.patch | 89 89 0 0 ++
/trunk/patches/glibc/2_9/370-hppa_glibc-2.7-hppa-nptl-carlos.patch | 249 249 0 0 ++++++
/trunk/patches/glibc/2_9/450-alpha-glibc-2.5-no-page-header.patch | 32 32 0 0 +
/trunk/patches/glibc/2_9/270-ldbl-nexttowardf.patch | 68 68 0 0 ++
/trunk/patches/glibc/2_9/330-2.3.3-china.patch | 35 35 0 0 +
/trunk/patches/glibc/2_9/340-new-valencian-locale.patch | 120 120 0 0 +++
/trunk/patches/glibc/2_9/410-2.9-fnmatch.patch | 64 64 0 0 ++
/trunk/patches/glibc/2_9/350-2.4-undefine-__i686.patch | 47 47 0 0 +
/trunk/patches/glibc/2_9/160-i386-x86_64-revert-clone-cfi.patch | 53 53 0 0 +
/trunk/patches/glibc/2_9/420-dont-build-timezone.patch | 19 19 0 0 +
/trunk/patches/glibc/2_9/150-regex-BZ697.patch | 28 28 0 0 +
/trunk/patches/glibc/2_9/290-no-inline-gmon.patch | 38 38 0 0 +
/trunk/patches/glibc/2_9/280-section-comments.patch | 29 29 0 0 +
/trunk/patches/glibc/2_9/180-math-tests.patch | 72 72 0 0 ++
/trunk/patches/glibc/2_9/120-_nss_dns_gethostbyaddr2_r-check-and-adjust-the-buffer-alignment.patch | 35 35 0 0 +
/trunk/patches/glibc/2_9/250-resolv-dynamic.patch | 44 44 0 0 +
/trunk/patches/glibc/2_9/300-2.9-check_native-headers.patch | 22 22 0 0 +
/trunk/patches/glibc/2_9/310-2.3.6-fix-pr631.patch | 50 50 0 0 +
/trunk/patches/glibc/2_9/130-add_prio-macros.patch | 26 26 0 0 +
/trunk/patches/glibc/2_9/260-fadvise64_64.patch | 30 30 0 0 +
/trunk/patches/glibc/2_9/440-alpha-glibc-2.4-xstat.patch | 249 249 0 0 ++++++
/trunk/patches/glibc/2_9/170-2.10-dns-no-gethostbyname4.patch | 35 35 0 0 +
/trunk/patches/glibc/2_9/230-2.3.3-localedef-fix-trampoline.patch | 74 74 0 0 ++
/trunk/patches/glibc/2_9/360-2.8-nscd-one-fork.patch | 45 45 0 0 +
/trunk/patches/glibc/2_9/480-alpha-glibc-2.8-cache-shape.patch | 18 18 0 0 +
/trunk/patches/glibc/2_9/210-2.9-strlen-hack.patch | 109 109 0 0 +++
/trunk/patches/glibc/2_9/320-2.9-assume-pipe2.patch | 59 59 0 0 +
/trunk/patches/glibc/2_9/100-ssp-compat.patch | 193 193 0 0 +++++
/trunk/patches/glibc/2_9/110-respect-env-CPPFLAGS.patch | 30 30 0 0 +
/trunk/patches/glibc/2_9/220-manual-no-perl.patch | 29 29 0 0 +
/trunk/patches/glibc/2_9/390-2.3.3_pre20040117-pt_pax.patch | 35 35 0 0 +
/trunk/patches/glibc/2_9/460-alpha-glibc-2.5-no-asm-elf-header.patch | 38 38 0 0 +
/trunk/patches/glibc/2_9/400-tests-sandbox-libdl-paths.patch | 198 198 0 0 +++++
/trunk/patches/glibc/2_9/240-i386-LOAD_PIC_REG.patch | 23 23 0 0 +
/trunk/patches/glibc/2_9/200-awk-in-C-locale.patch | 23 23 0 0 +
/trunk/patches/glibc/2_9/430-2.7-cross-compile-nptl.patch | 57 57 0 0 +
/trunk/patches/glibc/2_9/380-2.3.6-dl_execstack-PaX-support.patch | 71 71 0 0 ++
/trunk/patches/glibc/2_9/490-ptr-mangling.patch | 114 114 0 0 +++
/trunk/patches/glibc/2_9/470-alpha-glibc-2.8-creat.patch | 19 19 0 0 +
41 files changed, 3094 insertions(+)
     1 Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/18_all_904-flatten-switch-stmt-00.patch
     2 http://gcc.gnu.org/ml/gcc-patches/2007-04/msg00927.html
     3 
     4 Hi,
     5 
     6 The attached patch makes sure that we create smaller object code for
     7 simple switch statements. We just make sure to flatten the switch
     8 statement into an if-else chain, basically.
     9 
    10 This fixes a size-regression as compared to gcc-3.4, as can be seen
    11 below.
    12 
    13 2007-04-15  Bernhard Fischer  <..>
    14 
    15 	* stmt.c (expand_case): Do not create a complex binary tree when
    16 	optimizing for size but rather use the simple ordered list.
    17 	(emit_case_nodes): do not emit jumps to the default_label when
    18 	optimizing for size.
    19 
    20 Not regtested so far.
    21 Comments?
    22 
    23 Attached is the test switch.c mentioned below.
    24 
    25 $ for i in 2.95 3.3 3.4 4.0 4.1 4.2.orig-HEAD 4.3.orig-HEAD 4.3-HEAD;do
    26 gcc-$i  -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done
    27 $ for i in 2.95 3.3 3.4 4.0 4.1 4.2.orig-HEAD 4.3.orig-HEAD 4.3-HEAD;do
    28 gcc-$i  -UCHAIN -Os -o switch-$i.o -c switch.c ;done
    29 
    30 $ size switch-*.o
    31    text	   data	    bss	    dec	    hex	filename
    32     169	      0	      0	    169	     a9	switch-2.95.o
    33     115	      0	      0	    115	     73	switch-3.3.o
    34     103	      0	      0	    103	     67	switch-3.4.o
    35     124	      0	      0	    124	     7c	switch-4.0.o
    36     124	      0	      0	    124	     7c	switch-4.1.o
    37     124	      0	      0	    124	     7c	switch-4.2.orig-HEAD.o
    38      95	      0	      0	     95	     5f	switch-4.3-HEAD.o
    39     124	      0	      0	    124	     7c	switch-4.3.orig-HEAD.o
    40     166	      0	      0	    166	     a6	switch-CHAIN-2.95.o
    41     111	      0	      0	    111	     6f	switch-CHAIN-3.3.o
    42      95	      0	      0	     95	     5f	switch-CHAIN-3.4.o
    43      95	      0	      0	     95	     5f	switch-CHAIN-4.0.o
    44      95	      0	      0	     95	     5f	switch-CHAIN-4.1.o
    45      95	      0	      0	     95	     5f	switch-CHAIN-4.2.orig-HEAD.o
    46      95	      0	      0	     95	     5f	switch-CHAIN-4.3-HEAD.o
    47      95	      0	      0	     95	     5f	switch-CHAIN-4.3.orig-HEAD.o
    48 
    49 
    50 Content-Type: text/x-diff; charset=us-ascii
    51 Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff"
    52 
    53 diff -durN gcc-4.3.1.orig/gcc/stmt.c gcc-4.3.1/gcc/stmt.c
    54 --- gcc-4.3.1.orig/gcc/stmt.c	2008-05-09 20:12:13.000000000 +0200
    55 +++ gcc-4.3.1/gcc/stmt.c	2008-06-10 14:57:58.000000000 +0200
    56 @@ -2509,7 +2509,11 @@
    57  	  use_cost_table
    58  	    = (TREE_CODE (orig_type) != ENUMERAL_TYPE
    59  	       && estimate_case_costs (case_list));
    60 -	  balance_case_nodes (&case_list, NULL);
    61 +	  /* When optimizing for size, we want a straight list to avoid
    62 +	     jumps as much as possible. This basically creates an if-else
    63 +	     chain.  */
    64 +	  if (!optimize_size)
    65 +	    balance_case_nodes (&case_list, NULL);
    66  	  emit_case_nodes (index, case_list, default_label, index_type);
    67  	  emit_jump (default_label);
    68  	}
    69 @@ -3067,6 +3071,7 @@
    70  	    {
    71  	      if (!node_has_low_bound (node, index_type))
    72  		{
    73 +		  if (!optimize_size) /* don't jl to the .default_label. */
    74  		  emit_cmp_and_jump_insns (index,
    75  					   convert_modes
    76  					   (mode, imode,