re PR target/85860 (ICE: in lra_split_hard_reg_for, at lra-assigns.c:1810:…

re PR target/85860 (ICE: in lra_split_hard_reg_for, at lra-assigns.c:1810: unable to find a register to spill with -flive-range-shrinkage -mbmi2)

2019-03-13  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/85860
	* lra-constraints.c (inherit_in_ebb): Update
	potential_reload_hard_regs along with live_hard_regs.

2019-03-13  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/85860
	* gcc.target/i386/pr85860.c: New.

From-SVN: r269662

gcc/ChangeLog

+2019-03-13  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR target/85860
+	* lra-constraints.c (inherit_in_ebb): Update
+	potential_reload_hard_regs along with live_hard_regs.
+
 2019-03-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/89498

gcc/lra-constraints.c

@@ -6365,6 +6365,7 @@ inherit_in_ebb (rtx_insn *head, rtx_insn *tail)
 			add_to_hard_reg_set (&s, PSEUDO_REGNO_MODE (dst_regno),
 					     reg_renumber[dst_regno]);
 		      AND_COMPL_HARD_REG_SET (live_hard_regs, s);
+		      AND_COMPL_HARD_REG_SET (potential_reload_hard_regs, s);
 		    }
 		  /* We should invalidate potential inheritance or
 		     splitting for the current insn usages to the next

gcc/testsuite/ChangeLog

+2019-03-13  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR target/85860
+	* gcc.target/i386/pr85860.c: New.
+
 2019-03-13  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/89686 - mixing init-capture and simple-capture in lambda.

gcc/testsuite/gcc.target/i386/pr85860.c

+/* { dg-do compile { target lp64 } } */
+/* { dg-options "-O2 -fno-guess-branch-probability -flive-range-shrinkage -mbmi2" } */
+
+int a, b, c, d, e;
+
+extern int bar(void);
+
+__int128
+foo (unsigned g, int h, long i, __int128 j, short k, __int128 l)
+{
+  unsigned __int128 m = j;
+  do
+    {
+      j %= 5;
+      c = c >> (m & 31);
+      e = __builtin_sub_overflow (b, 0, &m);
+      d = bar ();
+      l *= __builtin_mul_overflow_p ((unsigned) d, ~(unsigned __int128) 1,
+				     (unsigned __int128) 0);
+    }
+  while (a);
+  return m + j + k + l;
+}