patches/gcc/4.4.5/190-flatten-switch-stmt-00.patch
author "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
Mon Apr 16 15:25:36 2012 +0200 (2012-04-16)
changeset 2941 13e40098fffc
permissions -rw-r--r--
cc/gcc: update Linaro GCC revisions to 2012.04

Update Linaro GCC with the latest available revisions.

The 4.7 revision is also released, but the infrastructure is not yet ready for
it in CT-NG.

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
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diff -durN gcc-4.4.5.orig/gcc/stmt.c gcc-4.4.5/gcc/stmt.c
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--- gcc-4.4.5.orig/gcc/stmt.c	2010-03-08 12:46:28.000000000 +0100
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+++ gcc-4.4.5/gcc/stmt.c	2010-10-09 23:01:01.000000000 +0200
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@@ -2377,7 +2377,11 @@
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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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@@ -2943,6 +2947,7 @@
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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,