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/trunk/patches/gcc/4.3.3/210-noteGNUstack-00.patch | 47 26 21 0 ++++--- /trunk/patches/gcc/4.3.3/270-missing-execinfo_h.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/260-uclibc-conf-noupstream.patch | 13 9 4 0 +- /trunk/patches/gcc/4.3.3/220-noteGNUstack-01.patch | 97 51 46 0 +++++++------- /trunk/patches/gcc/4.3.3/240-pr25343.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/100-alpha-mieee-default.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/230-pr34571.patch | 23 8 15 0 +-- /trunk/patches/gcc/4.3.3/350-sh-without-headers.patch | 17 10 7 0 +- /trunk/patches/gcc/4.3.3/330-unwind-for-uClibc.patch | 19 12 7 0 ++- /trunk/patches/gcc/4.3.3/190-libstdc++-pic.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/150-sparc64-bsd.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/290-index_macro.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/140-netbsd-symbolic.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/110-trampolinewarn.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/160-flatten-switch-stmt-00.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/280-c99-complex-ugly-hack.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/300-libmudflap-susv3-legacy.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/170-libiberty-pic.patch | 11 8 3 0 +- /trunk/patches/gcc/4.3.3/250-sh-pr24836.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/120-java-nomulti.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/320-alpha-signal_h.patch | 14 10 4 0 +- /trunk/patches/gcc/4.3.3/180-superh-default-multilib.patch | 13 9 4 0 +- /trunk/patches/gcc/4.3.3/340-make-mno-spe-work-as-expected.patch | 41 23 18 0 +++--- /trunk/patches/gcc/4.3.3/200-pr24170.patch | 23 14 9 0 ++- /trunk/patches/gcc/4.3.3/310-arm-softfloat.patch | 17 11 6 0 +- /trunk/patches/gcc/4.3.3/130-cross-compile.patch | 23 14 9 0 ++- /trunk/config/cc/gcc.in | 7 7 0 0 + 27 files changed, 334 insertions(+), 210 deletions(-)
82 lines
3.1 KiB
Diff
82 lines
3.1 KiB
Diff
Original patch from: ../4.3.2/160-flatten-switch-stmt-00.patch
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-= BEGIN original header =-
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Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/18_all_904-flatten-switch-stmt-00.patch
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http://gcc.gnu.org/ml/gcc-patches/2007-04/msg00927.html
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Hi,
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The attached patch makes sure that we create smaller object code for
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simple switch statements. We just make sure to flatten the switch
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statement into an if-else chain, basically.
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This fixes a size-regression as compared to gcc-3.4, as can be seen
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below.
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2007-04-15 Bernhard Fischer <..>
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* stmt.c (expand_case): Do not create a complex binary tree when
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optimizing for size but rather use the simple ordered list.
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(emit_case_nodes): do not emit jumps to the default_label when
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optimizing for size.
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Not regtested so far.
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Comments?
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Attached is the test switch.c mentioned below.
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$ 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
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gcc-$i -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done
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$ 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
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gcc-$i -UCHAIN -Os -o switch-$i.o -c switch.c ;done
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$ size switch-*.o
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text data bss dec hex filename
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169 0 0 169 a9 switch-2.95.o
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115 0 0 115 73 switch-3.3.o
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103 0 0 103 67 switch-3.4.o
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124 0 0 124 7c switch-4.0.o
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124 0 0 124 7c switch-4.1.o
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124 0 0 124 7c switch-4.2.orig-HEAD.o
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95 0 0 95 5f switch-4.3-HEAD.o
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124 0 0 124 7c switch-4.3.orig-HEAD.o
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166 0 0 166 a6 switch-CHAIN-2.95.o
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111 0 0 111 6f switch-CHAIN-3.3.o
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95 0 0 95 5f switch-CHAIN-3.4.o
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95 0 0 95 5f switch-CHAIN-4.0.o
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95 0 0 95 5f switch-CHAIN-4.1.o
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95 0 0 95 5f switch-CHAIN-4.2.orig-HEAD.o
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95 0 0 95 5f switch-CHAIN-4.3-HEAD.o
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95 0 0 95 5f switch-CHAIN-4.3.orig-HEAD.o
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Content-Type: text/x-diff; charset=us-ascii
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Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff"
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-= END original header =-
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diff -durN gcc-4.3.3.orig/gcc/stmt.c gcc-4.3.3/gcc/stmt.c
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--- gcc-4.3.3.orig/gcc/stmt.c 2008-05-09 20:12:13.000000000 +0200
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+++ gcc-4.3.3/gcc/stmt.c 2009-01-27 22:19:28.000000000 +0100
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@@ -2509,7 +2509,11 @@
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use_cost_table
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= (TREE_CODE (orig_type) != ENUMERAL_TYPE
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&& estimate_case_costs (case_list));
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- balance_case_nodes (&case_list, NULL);
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+ /* When optimizing for size, we want a straight list to avoid
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+ jumps as much as possible. This basically creates an if-else
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+ chain. */
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+ if (!optimize_size)
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+ balance_case_nodes (&case_list, NULL);
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emit_case_nodes (index, case_list, default_label, index_type);
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emit_jump (default_label);
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}
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@@ -3067,6 +3071,7 @@
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{
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if (!node_has_low_bound (node, index_type))
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{
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+ if (!optimize_size) /* don't jl to the .default_label. */
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emit_cmp_and_jump_insns (index,
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convert_modes
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(mode, imode,
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