[PATCH][committed]middle-end intialize regnum in store_bit_field_1

[Tamar Christina via Gcc-patches]

Hi All,

This initializes regnum to 0 for when undefined_p.
0 is the right default as it's supposed to get the lowpart
when undefined.

Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

        * expmed.cc (store_bit_field_1): Initialize regnum to 0.

--- inline copy of patch -- 
diff --git a/gcc/expmed.cc b/gcc/expmed.cc
index 
8d7418be418406e72a895ecddf2dc7fdb950c76c..cdc0adb389202a5cab79a8d89056ddc347fb28cb
 100644
--- a/gcc/expmed.cc
+++ b/gcc/expmed.cc
@@ -794,7 +794,7 @@ store_bit_field_1 (rtx str_rtx, poly_uint64 bitsize, 
poly_uint64 bitnum,
         words or to cope with mode punning between equal-sized modes.
         In the latter case, use subreg on the rhs side, not lhs.  */
       rtx sub;
-      HOST_WIDE_INT regnum;
+      HOST_WIDE_INT regnum = 0;
       poly_uint64 regsize = REGMODE_NATURAL_SIZE (GET_MODE (op0));
       if (known_eq (bitnum, 0U)
          && known_eq (bitsize, GET_MODE_BITSIZE (GET_MODE (op0))))




-- 

diff --git a/gcc/expmed.cc b/gcc/expmed.cc
index 
8d7418be418406e72a895ecddf2dc7fdb950c76c..cdc0adb389202a5cab79a8d89056ddc347fb28cb
 100644
--- a/gcc/expmed.cc
+++ b/gcc/expmed.cc
@@ -794,7 +794,7 @@ store_bit_field_1 (rtx str_rtx, poly_uint64 bitsize, 
poly_uint64 bitnum,
         words or to cope with mode punning between equal-sized modes.
         In the latter case, use subreg on the rhs side, not lhs.  */
       rtx sub;
-      HOST_WIDE_INT regnum;
+      HOST_WIDE_INT regnum = 0;
       poly_uint64 regsize = REGMODE_NATURAL_SIZE (GET_MODE (op0));
       if (known_eq (bitnum, 0U)
          && known_eq (bitsize, GET_MODE_BITSIZE (GET_MODE (op0))))