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gcc: remove 904-flatten-switch-stmt-00.patch 

Remove brute-force flattening and bump PR.
Refer to -ftree-switch-conversion emit_case_bit_tests(),
-ftree-if-to-switch-conversion et al in 4.8

(From OE-Core rev: 2eb0e56217137ece3d86a70676a3f3c8db525459)

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bernhard Reutner-Fischer 2012-07-18 20:19:08 +02:00 committed by Richard Purdie
parent ac7a031182
commit 3e89b62a47
2 changed files with 1 additions and 78 deletions
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3
meta/recipes-devtools/gcc/gcc-4.7.inc
View File

@ -1,6 +1,6 @@
require gcc-common.inc
PR = "r6"
PR = "r7"
# Third digit in PV should be incremented after a minor release
# happens from this branch on gcc e.g. currently its 4.7.1
@ -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 \

76
meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch
View File

@ -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,