On Wed, Jul 18, 2012 at 11:03 AM, Bernhard Reutner-Fischer
<rep.dot....@gmail.com> wrote:
> Remove brute-force flattening.
> Refer to -ftree-switch-conversion emit_case_bit_tests(),
> -ftree-if-to-switch-conversion et al in 4.8
>
I have been meaning to remove this patch. Thanks for doing it
you need to bump PR as well.
Acked-by: Khem Raj <raj.k...@gmail.com>
> Signed-off-by: Bernhard Reutner-Fischer <rep.dot....@gmail.com>
> ---
> meta/recipes-devtools/gcc/gcc-4.7.inc | 1 -
> .../gcc/gcc-4.7/904-flatten-switch-stmt-00.patch | 76
> --------------------
> 2 files changed, 77 deletions(-)
> delete mode 100644
> meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch
>
> diff --git a/meta/recipes-devtools/gcc/gcc-4.7.inc
> b/meta/recipes-devtools/gcc/gcc-4.7.inc
> index ece32c1..682cfa8 100644
> --- a/meta/recipes-devtools/gcc/gcc-4.7.inc
> +++ b/meta/recipes-devtools/gcc/gcc-4.7.inc
> @@ -52,7 +52,6 @@ SRC_URI =
> "git://github.com/mirrors/gcc.git;branch=${BRANCH};protocol=git \
> file://306-libstdc++-namespace.patch \
> file://740-sh-pr24836.patch \
> file://800-arm-bigendian.patch \
> - file://904-flatten-switch-stmt-00.patch \
> file://arm-nolibfloat.patch \
> file://gcc-poison-system-directories.patch \
> file://gcc-poison-dir-extend.patch \
> diff --git
> a/meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch
> b/meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch
> deleted file mode 100644
> index e790e06..0000000
> --- a/meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch
> +++ /dev/null
> @@ -1,76 +0,0 @@
> -Upstream-Status: Pending
> -
> -Hi,
> -
> -The attached patch makes sure that we create smaller object code for
> -simple switch statements. We just make sure to flatten the switch
> -statement into an if-else chain, basically.
> -
> -This fixes a size-regression as compared to gcc-3.4, as can be seen
> -below.
> -
> -2007-04-15 Bernhard Fischer <..>
> -
> - * stmt.c (expand_case): Do not create a complex binary tree when
> - optimizing for size but rather use the simple ordered list.
> - (emit_case_nodes): do not emit jumps to the default_label when
> - optimizing for size.
> -
> -Not regtested so far.
> -Comments?
> -
> -Attached is the test switch.c mentioned below.
> -
> -$ 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
> -gcc-$i -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done
> -$ 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
> -gcc-$i -UCHAIN -Os -o switch-$i.o -c switch.c ;done
> -
> -$ size switch-*.o
> - text data bss dec hex filename
> - 169 0 0 169 a9 switch-2.95.o
> - 115 0 0 115 73 switch-3.3.o
> - 103 0 0 103 67 switch-3.4.o
> - 124 0 0 124 7c switch-4.0.o
> - 124 0 0 124 7c switch-4.1.o
> - 124 0 0 124 7c switch-4.2.orig-HEAD.o
> - 95 0 0 95 5f switch-4.3-HEAD.o
> - 124 0 0 124 7c switch-4.3.orig-HEAD.o
> - 166 0 0 166 a6 switch-CHAIN-2.95.o
> - 111 0 0 111 6f switch-CHAIN-3.3.o
> - 95 0 0 95 5f switch-CHAIN-3.4.o
> - 95 0 0 95 5f switch-CHAIN-4.0.o
> - 95 0 0 95 5f switch-CHAIN-4.1.o
> - 95 0 0 95 5f switch-CHAIN-4.2.orig-HEAD.o
> - 95 0 0 95 5f switch-CHAIN-4.3-HEAD.o
> - 95 0 0 95 5f switch-CHAIN-4.3.orig-HEAD.o
> -
> -
> -Content-Type: text/x-diff; charset=us-ascii
> -Content-Disposition: attachment;
> filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff"
> -
> -Index: gcc-4_7-branch/gcc/stmt.c
> -===================================================================
> ---- gcc-4_7-branch.orig/gcc/stmt.c 2012-04-10 10:19:49.095337065 -0700
> -+++ gcc-4_7-branch/gcc/stmt.c 2012-04-10 10:32:52.219375048 -0700
> -@@ -2397,7 +2397,11 @@
> - default code is emitted. */
> -
> - use_cost_table = estimate_case_costs (case_list);
> -- balance_case_nodes (&case_list, NULL);
> -+ /* When optimizing for size, we want a straight list to avoid
> -+ jumps as much as possible. This basically creates an if-else
> -+ chain. */
> -+ if (!optimize_size)
> -+ balance_case_nodes (&case_list, NULL);
> - emit_case_nodes (index, case_list, default_label, index_type);
> - if (default_label)
> - emit_jump (default_label);
> -@@ -2965,6 +2969,7 @@
> - {
> - if (!node_has_low_bound (node, index_type))
> - {
> -+ if (!optimize_size) /* don't jl to the .default_label. */
> - emit_cmp_and_jump_insns (index,
> - convert_modes
> - (mode, imode,
> --
> 1.7.10.4
>
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