* expr.c (emit_move_insn_1): Handle arbitrary moves that are

	the same size as a word.

	* regrename.c (find_oldest_value_reg): Take WORDS_BIG_ENDIAN /
	BYTES_BIG_ENDIAN into account.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@55482 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 15 insertions, 3 deletions

diff --git a/gcc/regrename.c b/gcc/regrename.c
index ffe170e2795..532d5753df3 100644
--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -1335,14 +1335,26 @@ find_oldest_value_reg (class, reg, vd)
     }
 
   for (i = vd->e[regno].oldest_regno; i != regno; i = vd->e[i].next_regno)
+    {
+      enum machine_mode oldmode = vd->e[i].mode;
+
     if (TEST_HARD_REG_BIT (reg_class_contents[class], i)
-	&& (vd->e[i].mode == mode
-	    || mode_change_ok (vd->e[i].mode, mode, i)))
+	&& (oldmode == mode
+	    || mode_change_ok (oldmode, mode, i)))
       {
-	rtx new = gen_rtx_raw_REG (mode, i);
+	int offset = GET_MODE_SIZE (oldmode) - GET_MODE_SIZE (mode);
+	int byteoffset = offset % UNITS_PER_WORD;
+	int wordoffset = offset - byteoffset;
+	rtx new;
+
+	offset = ((WORDS_BIG_ENDIAN ? wordoffset : 0)
+		  + (BYTES_BIG_ENDIAN ? byteoffset : 0));
+	new = (gen_rtx_raw_REG
+	       (mode, i + subreg_regno_offset (i, oldmode, offset, mode)));
 	ORIGINAL_REGNO (new) = ORIGINAL_REGNO (reg);
 	return new;
       }
+    }
 
   return NULL_RTX;
 }