From: Richard Kenner <kenner@gcc.gnu.org>
Date: Mon, 10 Apr 1995 11:57:09 +0000 (-0400)
Subject: (simplify_set): Don't move a SUBREG to dest if it is changing the size
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f507a0704432f434b19063ced39f4e5cba986a5d;p=gcc.git

(simplify_set): Don't move a SUBREG to dest if it is changing the size
of a hard reg in CLASS_CANNOT_CHANGE_SIZE.

From-SVN: r9346
---

diff --git a/gcc/combine.c b/gcc/combine.c
index 48e5a87c2ac..2bb00d41bfd 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -4334,6 +4334,14 @@ simplify_set (x)
       && (GET_MODE_SIZE (GET_MODE (src))
 	  < GET_MODE_SIZE (GET_MODE (SUBREG_REG (src))))
 #endif
+#ifdef CLASS_CANNOT_CHANGE_SIZE
+      && ! (GET_CODE (dest) == REG && REGNO (dest) < FIRST_PSEUDO_REGISTER
+	    && (TEST_HARD_REG_BIT
+		(reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE],
+		 REGNO (dest)))
+	    && (GET_MODE_SIZE (GET_MODE (src))
+		!= GET_MODE_SIZE (GET_MODE (SUBREG_REG (src)))))
+#endif				  
       && (GET_CODE (dest) == REG
 	  || (GET_CODE (dest) == SUBREG
 	      && GET_CODE (SUBREG_REG (dest)) == REG)))