system.h (CASE_USE_BIT_TESTS): Poison.

	* system.h (CASE_USE_BIT_TESTS): Poison.
	* stmt.c (CASE_USE_BIT_TESTS): Fold away into its only user ...
	(expand_switch_using_bit_tests_p): ...here.
	* doc/tm.texi.in (CASE_USE_BIT_TESTS): Remove documentation.
	* doc/tm.texi (CASE_USE_BIT_TESTS): Regenerate.

From-SVN: r189078

5 files changed, 14 insertions, 30 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 82c968c..b45840f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,13 @@
 2012-06-29  Steven Bosscher  <steven@gcc.gnu.org>
 
+	* system.h (CASE_USE_BIT_TESTS): Poison.
+	* stmt.c (CASE_USE_BIT_TESTS): Fold away into its only user ...
+	(expand_switch_using_bit_tests_p): ...here.
+	* doc/tm.texi.in (CASE_USE_BIT_TESTS): Remove documentation.
+	* doc/tm.texi (CASE_USE_BIT_TESTS): Regenerate.
+
+2012-06-29  Steven Bosscher  <steven@gcc.gnu.org>
+
 	* system.h (IFCVT_EXTRA_FIELDS): Poison.
 	(IFCVT_INIT_EXTRA_FIELDS): Poison.
 	* basic-block.h (struct ce_if_block): Remove IFCVT_EXTRA_FIELDS.
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 282bc148..a11e2c0 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -10306,16 +10306,6 @@ The default is four for machines with a @code{casesi} instruction and
 five otherwise.  This is best for most machines.
 @end deftypefn
 
-@defmac CASE_USE_BIT_TESTS
-Define this macro to be a C expression to indicate whether C switch
-statements may be implemented by a sequence of bit tests.  This is
-advantageous on processors that can efficiently implement left shift
-of 1 by the number of bits held in a register, but inappropriate on
-targets that would require a loop.  By default, this macro returns
-@code{true} if the target defines an @code{ashlsi3} pattern, and
-@code{false} otherwise.
-@end defmac
-
 @defmac WORD_REGISTER_OPERATIONS
 Define this macro if operations between registers with integral mode
 smaller than a word are always performed on the entire register.
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 6f97b28..4ec2469 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -10180,16 +10180,6 @@ The default is four for machines with a @code{casesi} instruction and
 five otherwise.  This is best for most machines.
 @end deftypefn
 
-@defmac CASE_USE_BIT_TESTS
-Define this macro to be a C expression to indicate whether C switch
-statements may be implemented by a sequence of bit tests.  This is
-advantageous on processors that can efficiently implement left shift
-of 1 by the number of bits held in a register, but inappropriate on
-targets that would require a loop.  By default, this macro returns
-@code{true} if the target defines an @code{ashlsi3} pattern, and
-@code{false} otherwise.
-@end defmac
-
 @defmac WORD_REGISTER_OPERATIONS
 Define this macro if operations between registers with integral mode
 smaller than a word are always performed on the entire register.
diff --git a/gcc/stmt.c b/gcc/stmt.c
index 4ad4d0f..ea0d3a5 100644
--- a/gcc/stmt.c
+++ b/gcc/stmt.c
@@ -1722,13 +1722,6 @@ add_case_node (struct case_node *head, tree type, tree low, tree high,
 /* Maximum number of case bit tests.  */
 #define MAX_CASE_BIT_TESTS  3
 
-/* By default, enable case bit tests on targets with ashlsi3.  */
-#ifndef CASE_USE_BIT_TESTS
-#define CASE_USE_BIT_TESTS  (optab_handler (ashl_optab, word_mode) \
-			     != CODE_FOR_nothing)
-#endif
-
-
 /* A case_bit_test represents a set of case nodes that may be
    selected from using a bit-wise comparison.  HI and LO hold
    the integer to be tested against, LABEL contains the label
@@ -1888,8 +1881,10 @@ bool
 expand_switch_using_bit_tests_p (tree index_expr, tree range,
 				 unsigned int uniq, unsigned int count)
 {
-  return (CASE_USE_BIT_TESTS
-	  && ! TREE_CONSTANT (index_expr)
+  if (optab_handler (ashl_optab, word_mode) == CODE_FOR_nothing)
+    return false;
+ 
+  return (! TREE_CONSTANT (index_expr)
 	  && compare_tree_int (range, GET_MODE_BITSIZE (word_mode)) < 0
 	  && compare_tree_int (range, 0) > 0
 	  && lshift_cheap_p ()
diff --git a/gcc/system.h b/gcc/system.h
index d2e9e51..f8b5232 100644
--- a/gcc/system.h
+++ b/gcc/system.h
@@ -895,7 +895,8 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 	TARGET_ALIGN_ANON_BITFIELDS TARGET_NARROW_VOLATILE_BITFIELDS	   \
 	IDENT_ASM_OP UNALIGNED_SHORT_ASM_OP UNALIGNED_INT_ASM_OP	   \
 	UNALIGNED_LONG_ASM_OP UNALIGNED_DOUBLE_INT_ASM_OP		   \
-	USE_COMMON_FOR_ONE_ONLY IFCVT_EXTRA_FIELDS IFCVT_INIT_EXTRA_FIELDS
+	USE_COMMON_FOR_ONE_ONLY IFCVT_EXTRA_FIELDS IFCVT_INIT_EXTRA_FIELDS \
+	CASE_USE_BIT_TESTS
 
 /* Hooks that are no longer used.  */
  #pragma GCC poison LANG_HOOKS_FUNCTION_MARK LANG_HOOKS_FUNCTION_FREE	\