re PR target/91604 (ICE in extract_insn at recog.c:2310 since r272323)

	PR target/91604
	* config/i386/i386-expand.c (split_double_mode): If there is more than
	one MEM operand and they are rtx_equal_p, reuse lo_half/hi_half from
	already split matching MEM operand instead of calling adjust_address
	again.

	* gcc.target/i386/pr91604.c: New test.

From-SVN: r275344

gcc/ChangeLog

+2019-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/91604
+	* config/i386/i386-expand.c (split_double_mode): If there is more than
+	one MEM operand and they are rtx_equal_p, reuse lo_half/hi_half from
+	already split matching MEM operand instead of calling adjust_address
+	again.
+
 2019-09-03  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* config.gcc: Obsolete spu target.  Remove references to spu.

gcc/config/i386/i386-expand.c

@@ -106,6 +106,8 @@ split_double_mode (machine_mode mode, rtx operands[],
 {
   machine_mode half_mode;
   unsigned int byte;
+  rtx mem_op = NULL_RTX;
+  int mem_num = 0;
 
   switch (mode)
     {
@@ -129,8 +131,18 @@ split_double_mode (machine_mode mode, rtx operands[],
          but we still have to handle it.  */
       if (MEM_P (op))
 	{
-	  lo_half[num] = adjust_address (op, half_mode, 0);
-	  hi_half[num] = adjust_address (op, half_mode, byte);
+	  if (mem_op && rtx_equal_p (op, mem_op))
+	    {
+	      lo_half[num] = lo_half[mem_num];
+	      hi_half[num] = hi_half[mem_num];
+	    }
+	  else
+	    {
+	      mem_op = op;
+	      mem_num = num;
+	      lo_half[num] = adjust_address (op, half_mode, 0);
+	      hi_half[num] = adjust_address (op, half_mode, byte);
+	    }
 	}
       else
 	{

gcc/testsuite/ChangeLog

+2019-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/91604
+	* gcc.target/i386/pr91604.c: New test.
+
 2019-09-03  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* lib/compat.exp: Remove references to spu.

gcc/testsuite/gcc.target/i386/pr91604.c

+/* PR target/91604 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -msse2 --param max-gcse-memory=0 -fno-rerun-cse-after-loop" } */
+
+long long v;
+
+void
+foo (void)
+{
+  v = ~v;
+}