* gcse.c (hoist_code): Generate new pseudo for every new set insn.

git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@162591 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 6 insertions, 2 deletions

diff --git a/gcc/gcse.c b/gcc/gcse.c
index 4b2547c3367..812cc0a888d 100644
--- a/gcc/gcse.c
+++ b/gcc/gcse.c
@@ -4581,8 +4581,12 @@ hoist_code (void)
 
 		      /* Create a pseudo-reg to store the result of reaching
 			 expressions into.  Get the mode for the new pseudo
-			 from the mode of the original destination pseudo.  */
-		      if (expr->reaching_reg == NULL)
+			 from the mode of the original destination pseudo.
+
+			 It is important to use new pseudos whenever we
+			 emit a set.  This will allow reload to use
+			 rematerialization for such registers.  */
+		      if (!insn_inserted_p)
 			expr->reaching_reg
 			  = gen_reg_rtx_and_attrs (SET_DEST (set));