gcc: revert an upstream patch that is causing a regression on powerpc

https://forum.openwrt.org/viewtopic.php?pid=232494#p232494

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 40709

toolchain/gcc/patches/4.8-linaro/001-revert_register_mode_search.patch

@@ -0,0 +1,65 @@
+Revert of:
+
+commit 275035b56823b26d5fb7e90fad945b998648edf2
+Author: bergner <bergner@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date:   Thu Sep 5 14:09:07 2013 +0000
+
+        PR target/58139
+        * reginfo.c (choose_hard_reg_mode): Scan through all mode classes
+        looking for widest mode.
+
+
+    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202286 138bc75d-0d04-0410-961f-82ee72b054a4
+
+
+--- a/gcc/reginfo.c
++++ b/gcc/reginfo.c
+@@ -620,35 +620,40 @@ choose_hard_reg_mode (unsigned int regno
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
++  if (found_mode != VOIDmode)
++    return found_mode;
++
+   for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
+        mode != VOIDmode;
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
++  if (found_mode != VOIDmode)
++    return found_mode;
++
+   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
+        mode != VOIDmode;
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
++  if (found_mode != VOIDmode)
++    return found_mode;
++
+   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
+        mode != VOIDmode;
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
+   if (found_mode != VOIDmode)