diff options
Diffstat (limited to 'patches/gcc-4.5.2/0011-flatten-switch-stmt-00.patch')
-rw-r--r-- | patches/gcc-4.5.2/0011-flatten-switch-stmt-00.patch | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/patches/gcc-4.5.2/0011-flatten-switch-stmt-00.patch b/patches/gcc-4.5.2/0011-flatten-switch-stmt-00.patch deleted file mode 100644 index 0376bb7..0000000 --- a/patches/gcc-4.5.2/0011-flatten-switch-stmt-00.patch +++ /dev/null @@ -1,81 +0,0 @@ -From: Bernhard Reutner-Fischer <aldot@gcc.gnu.org> - -This is http://gcc.gnu.org/ml/gcc-patches/2007-04/msg00927.html - -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 - -Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de> ---- - gcc/stmt.c | 9 ++++++++- - 1 file changed, 8 insertions(+), 1 deletion(-) - -Index: gcc-4.5.1/gcc/stmt.c -=================================================================== ---- gcc-4.5.1.orig/gcc/stmt.c -+++ gcc-4.5.1/gcc/stmt.c -@@ -2440,7 +2440,13 @@ expand_case (gimple stmt) - 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); -@@ -3008,6 +3014,7 @@ emit_case_nodes (rtx index, case_node_pt - { - 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, |