[ARM] Enable arm_legitimize_address for Thumb-2

Currently arm_legitimize_address doesn't handle Thumb-2 at all, resulting in
inefficient code.  Since Thumb-2 supports similar address offsets use the Arm
legitimization code for Thumb-2 to get significant codesize and performance
gains.  SPECINT2006 shows 0.4% gain on Cortex-A57, while SPECFP improves 0.2%.

    gcc/
	* config/arm/arm.c (arm_legitimize_address): Remove Thumb-2 bailout.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@276961 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f07a0e61e6be6fbcb6983a3b8b6a8d617c5dad1a..176c0d219795c6b90d046a4b2040b01119fd527b 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2019-10-14  Wilco Dijkstra  <wdijkstr@arm.com>
+
+       * config/arm/arm.c (arm_legitimize_address): Remove Thumb-2 bailout.
+
 2019-10-14  Wilco Dijkstra  <wdijkstr@arm.com>
 
        * config/arm/arm.c (arm_option_override): Don't override sched

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 394b1dd1902b21006a512c52f71d13c422be4a59..ba33047014113949162d0c8de6f0b4571304cf7a 100644 (file)
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -8934,13 +8934,8 @@ arm_legitimize_address (rtx x, rtx orig_x, machine_mode mode)
        return x;
     }
 
-  if (!TARGET_ARM)
-    {
-      /* TODO: legitimize_address for Thumb2.  */
-      if (TARGET_THUMB2)
-        return x;
-      return thumb_legitimize_address (x, orig_x, mode);
-    }
+  if (TARGET_THUMB1)
+    return thumb_legitimize_address (x, orig_x, mode);
 
   if (GET_CODE (x) == PLUS)
     {