1 files changed, 18 insertions, 0 deletions
diff --git a/toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch b/toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch
new file mode 100644
index 000000000..387e02a78
--- /dev/null
+++ b/toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch
@@ -0,0 +1,18 @@
+https://bugs.launchpad.net/gcc-linaro/+bug/728315
+https://lists.openwrt.org/pipermail/openwrt-devel/2011-March/009847.html
+
+--- a/gcc/ee.c
++++ b/gcc/ee.c
+@@ -209,7 +209,11 @@
+
+       *regno = REGNO (reg);
+
+-      if (paradoxical_subreg_p (use))
++      /* Non-paradoxical SUBREGs of promoted vars guarantee that the
++	 upper (elided) bits of the inner register have a particular value.
++	 For our purposes, such SUBREGs act as a full reference to the
++	 inner register.  */
++      if (paradoxical_subreg_p (use) || SUBREG_PROMOTED_VAR_P (use))
+         *size = GET_MODE_BITSIZE (GET_MODE (reg));
+       else
+         *size = subreg_lsb (use) + GET_MODE_BITSIZE (GET_MODE (use));