re PR target/43920 (Choosing conditional execution over conditional branches for…

re PR target/43920 (Choosing conditional execution over conditional branches for code size in some cases.)

2011-04-05  Tom de Vries  <tom@codesourcery.com>

	PR target/43920
	* config/arm/arm.h (BRANCH_COST): Set to 1 for Thumb-2 when optimizing
	for size.

From-SVN: r171978

gcc/ChangeLog

 2011-04-05  Tom de Vries  <tom@codesourcery.com>
 
 	PR target/43920
+	* config/arm/arm.h (BRANCH_COST): Set to 1 for Thumb-2 when optimizing
+	for size.
+
+2011-04-05  Tom de Vries  <tom@codesourcery.com>
+
+	PR target/43920
 	* function.c (emit_use_return_register_into_block): New function.
 	(thread_prologue_and_epilogue_insns): Use
 	emit_use_return_register_into_block.

gcc/config/arm/arm.h

@@ -2019,7 +2019,8 @@ typedef struct
 /* Try to generate sequences that don't involve branches, we can then use
    conditional instructions */
 #define BRANCH_COST(speed_p, predictable_p) \
-  (TARGET_32BIT ? 4 : (optimize > 0 ? 2 : 0))
+  (TARGET_32BIT ? (TARGET_THUMB2 && !speed_p ? 1 : 4) \
+		: (optimize > 0 ? 2 : 0))
 
 /* Position Independent Code.  */
 /* We decide which register to use based on the compilation options and