re PR rtl-optimization/88296 (Infinite loop in lra_split_hard_reg_for)

PR rtl-optimization/88296
	* gcc.target/i386/pr88296.c: New test.

From-SVN: r267831

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2019-01-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/88296
+	* gcc.target/i386/pr88296.c: New test.
+
 2019-01-11  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* g++.dg/diagnostic/extern-initialized.C: New.

gcc/testsuite/gcc.target/i386/pr88296.c

@@ -0,0 +1,66 @@
+/* PR rtl-optimization/88296 */
+/* { dg-do compile { target int128 } } */
+/* { dg-options "-O2 -march=core2 -fnon-call-exceptions -fschedule-insns -fselective-scheduling -funroll-all-loops -fno-caller-saves -fno-guess-branch-probability -fno-ivopts -fno-rerun-cse-after-loop -fno-split-wide-types -fno-tree-bit-ccp -fno-tree-coalesce-vars --param max-completely-peeled-insns=13" } */
+
+int a, b, c;
+void bar (int, int);
+
+void
+foo (__int128 x, unsigned int y, char z)
+{
+  __int128 *d = &x;
+  unsigned short int e = 0;
+  unsigned char f = 0;
+  char g = 1;
+  (void) d;
+  bar (0, 0);
+  while (e < 1)
+    {
+      __int128 h = 1;
+      ++c;
+      e = x;
+      g /= e;
+      if (g != 0)
+        {
+          int i;
+          if (g == 0)
+            i = a;
+          else
+            {
+              ++g;
+              i = g;
+            }
+          if (i == 0)
+            {
+              a -= b + (!!g ? y : 0);
+              break;
+            }
+          for (g = 0; g < 3; ++g)
+            {
+              unsigned char *j = &f;
+              x /= h;
+              h /= x;
+              for (i = 0; i < 2; ++i)
+                {
+                  z <<= ((!!g && !!c) ? (b + 1) : (1 / *j));
+                  y = ~e;
+                  g &= y;
+                  x |= 1;
+                  b *= i;
+                  ++c;
+                }
+              f /= b > 1;
+              e /= f;
+              x += b << 32;	/* { dg-warning "left shift count" } */
+            }
+          if (g << g == 0)
+            {
+              e *= b + 1;
+              a = 32;
+              f += (e << a) + (y && 1);
+              x = z;
+              c += x / 3;
+            }
+        }
+    }
+}