re PR rtl-optimization/87305 (Segfault in end_hard_regno in…

re PR rtl-optimization/87305 (Segfault in end_hard_regno in setup_live_pseudos_and_spill_after_risky_transforms on aarch64 big-endian)

2019-01-11  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/87305
	* lra-assigns.c
	(setup_live_pseudos_and_spill_after_risky_transforms): Add code
	for little endian pseudos used as paradoxical subreg.

From-SVN: r267854

gcc/ChangeLog

+2019-01-11  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/87305
+	* lra-assigns.c
+	(setup_live_pseudos_and_spill_after_risky_transforms): Add code
+	for little endian pseudos used as paradoxical subreg.
+
 2019-01-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/88693

gcc/lra-assigns.c

@@ -1174,10 +1174,14 @@ setup_live_pseudos_and_spill_after_risky_transforms (bitmap
 		      - hard_regno_nregs (hard_regno, PSEUDO_REGNO_MODE (i)));
 	enum reg_class rclass = lra_get_allocno_class (i);
 
-	if (WORDS_BIG_ENDIAN
-	    && (hard_regno - nregs_diff < 0
-		|| !TEST_HARD_REG_BIT (reg_class_contents[rclass],
-				       hard_regno - nregs_diff)))
+	if ((WORDS_BIG_ENDIAN
+	     && (hard_regno - nregs_diff < 0
+		 || !TEST_HARD_REG_BIT (reg_class_contents[rclass],
+					hard_regno - nregs_diff)))
+	    || (!WORDS_BIG_ENDIAN
+		&& (hard_regno + nregs_diff >= FIRST_PSEUDO_REGISTER
+		    || !TEST_HARD_REG_BIT (reg_class_contents[rclass],
+					   hard_regno + nregs_diff))))
 	  {
 	    /* Hard registers of paradoxical sub-registers are out of
 	       range of pseudo register class.  Spill the pseudo.  */