(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

(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
f507a070 · Richard Kenner · 0639444f · f507a070
Commit f507a070 authored Apr 10, 1995 by Richard Kenner
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gcc/combine.c
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--- 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)))