re PR rtl-optimization/87246 (ICE in decompose_normal_address, at rtlanal.c:6379)

2019-01-30  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/87246
	* lra-constraints.c (simplify_operand_subreg): Reload memory
	in subreg if the address became invalid.

2019-01-30  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/87246
	* gcc.target/i386/pr87246.c: New.

From-SVN: r268404

4 files changed, 52 insertions, 13 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f7f145f..895194f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-01-30  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/87246
+	* lra-constraints.c (simplify_operand_subreg): Reload memory
+	in subreg if the address became invalid.
+
 2019-01-30  Bill Schmidt  <wschmidt@linux.ibm.com>
 
 	PR target/87064
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index 0ef1343..d581513 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -1497,10 +1497,11 @@ simplify_operand_subreg (int nop, machine_mode reg_mode)
       alter_subreg (curr_id->operand_loc[nop], false);
       rtx subst = *curr_id->operand_loc[nop];
       lra_assert (MEM_P (subst));
-
+      const bool addr_is_valid = valid_address_p (GET_MODE (subst),
+						  XEXP (subst, 0),
+						  MEM_ADDR_SPACE (subst));
       if (!addr_was_valid
-	  || valid_address_p (GET_MODE (subst), XEXP (subst, 0),
-			      MEM_ADDR_SPACE (subst))
+	  || addr_is_valid
 	  || ((get_constraint_type (lookup_constraint
 				    (curr_static_id->operand[nop].constraint))
 	       != CT_SPECIAL_MEMORY)
@@ -1529,12 +1530,17 @@ simplify_operand_subreg (int nop, machine_mode reg_mode)
 	     data into a register when the inner is narrower than outer or
 	     missing important data from memory when the inner is wider than
 	     outer.  This rule only applies to modes that are no wider than
-	     a word.  */
-	  if (!(maybe_ne (GET_MODE_PRECISION (mode),
-			  GET_MODE_PRECISION (innermode))
-		&& known_le (GET_MODE_SIZE (mode), UNITS_PER_WORD)
-		&& known_le (GET_MODE_SIZE (innermode), UNITS_PER_WORD)
-		&& WORD_REGISTER_OPERATIONS)
+	     a word.
+
+	     If valid memory becomes invalid after subreg elimination
+	     we still have to reload memory.
+	  */
+	  if ((! addr_was_valid || addr_is_valid)
+	      && !(maybe_ne (GET_MODE_PRECISION (mode),
+			     GET_MODE_PRECISION (innermode))
+		   && known_le (GET_MODE_SIZE (mode), UNITS_PER_WORD)
+		   && known_le (GET_MODE_SIZE (innermode), UNITS_PER_WORD)
+		   && WORD_REGISTER_OPERATIONS)
 	      && (!(MEM_ALIGN (subst) < GET_MODE_ALIGNMENT (mode)
 		    && targetm.slow_unaligned_access (mode, MEM_ALIGN (subst)))
 		  || (MEM_ALIGN (reg) < GET_MODE_ALIGNMENT (innermode)
@@ -1553,7 +1559,7 @@ simplify_operand_subreg (int nop, machine_mode reg_mode)
 	  enum reg_class rclass
 	    = (enum reg_class) targetm.preferred_reload_class (reg, ALL_REGS);
 	  if (get_reload_reg (curr_static_id->operand[nop].type, innermode,
-			      reg, rclass, TRUE, "slow mem", &new_reg))
+			      reg, rclass, TRUE, "slow/invalid mem", &new_reg))
 	    {
 	      bool insert_before, insert_after;
 	      bitmap_set_bit (&lra_subreg_reload_pseudos, REGNO (new_reg));
@@ -1572,7 +1578,7 @@ simplify_operand_subreg (int nop, machine_mode reg_mode)
 	  rclass
 	    = (enum reg_class) targetm.preferred_reload_class (reg, ALL_REGS);
 	  if (get_reload_reg (curr_static_id->operand[nop].type, mode, reg,
-			      rclass, TRUE, "slow mem", &new_reg))
+			      rclass, TRUE, "slow/invalid mem", &new_reg))
 	    {
 	      bool insert_before, insert_after;
 	      bitmap_set_bit (&lra_subreg_reload_pseudos, REGNO (new_reg));
@@ -1585,7 +1591,7 @@ simplify_operand_subreg (int nop, machine_mode reg_mode)
 	    }
 	  *curr_id->operand_loc[nop] = new_reg;
 	  lra_process_new_insns (curr_insn, before, after,
-				 "Inserting slow mem reload");
+				 "Inserting slow/invalid mem reload");
 	  return true;
 	}
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8bb5f40..d14df18 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-01-30  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/87246
+	* gcc.target/i386/pr87246.c: New.
+
 2019-01-30  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/89119 - ICE with value-initialization in template.
@@ -15,7 +20,7 @@
 	* gcc.target/powerpc/vec-extract-uint128-1.c: New test.
 	* gcc.target/powerpc/vec-extract-ulong-1.c: New test.
 	* gcc.target/powerpc/vec-extract-ushort-1.c: New test.
-	
+
 2019-01-30  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/89111
diff --git a/gcc/testsuite/gcc.target/i386/pr87246.c b/gcc/testsuite/gcc.target/i386/pr87246.c
new file mode 100644
index 0000000..82322e4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr87246.c
@@ -0,0 +1,22 @@
+/* PR rtl-optimization/87246 */
+/* { dg-do compile { target int128 } } */
+/* { dg-options "-O2 -w -fnon-call-exceptions -fno-split-wide-types" } */
+
+__int128 zd;
+int c1;
+
+void
+s2 (__int128 *qv)
+{
+  if (*qv != 0)
+    {
+      zd = 0;
+      c1 = c1 <= *qv;
+    }
+}
+
+void
+lt (unsigned int vb)
+{
+  s2 (vb + 1);
+}