patches/gcc/4.4.2/190-flatten-switch-stmt-00.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Tue Jan 12 19:24:03 2010 +0100 (2010-01-12)
changeset 1761 88020b2c3246
parent 1544 2228ea3f6b79
permissions -rw-r--r--
scripts/functions: change handling of nochdir

- 'nochdir' must be the first option
- have systematic pushd/popd, even if nochdir
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diff -durN gcc-4.4.0.orig/gcc/stmt.c gcc-4.4.0/gcc/stmt.c
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--- gcc-4.4.0.orig/gcc/stmt.c	2009-02-27 20:49:42.000000000 +0100
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+++ gcc-4.4.0/gcc/stmt.c	2009-05-27 21:38:21.000000000 +0200
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@@ -2376,7 +2376,11 @@
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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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 	  if (default_label)
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 	    emit_jump (default_label);
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@@ -2942,6 +2946,7 @@
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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,