gcc.target/cris/pr93372-2.c, -5.c, -8.c: New tests.

* gcc.target/cris/pr93372-2.c, gcc.target/cris/pr93372-5.c,
gcc.target/cris/pr93372-8.c: New tests.

These tests fails miserably both at being an example of cc0
eliminating compare instructions, and post-cc0-CRIS at showing a
significant improvement.  They're here to track suboptimal
comparison code for CRIS.

gcc/testsuite/ChangeLog

@@ -3,6 +3,8 @@
 	* gcc.target/cris/cris.exp (check_effective_target_cc0): New.
 
 	* gcc.target/cris/pr93372-1.c: New test.
+	* gcc.target/cris/pr93372-2.c, gcc.target/cris/pr93372-5.c,
+	gcc.target/cris/pr93372-8.c: New tests.
 
 2020-02-10  Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/gcc.target/cris/pr93372-2.c

+/* Check that eliminable compare-instructions are eliminated. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-not "\tcmp|\ttest" { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-not "\tnot" { xfail cc0 } } } */
+/* { dg-final { scan-assembler-not "\tlsr" { xfail cc0 } } } */
+
+int f(int a, int b, int *d)
+{
+  int c = a - b;
+
+  /* Whoops!  We get a cmp.d with the original operands here. */
+  *d = (c == 0);
+
+  /* Whoops!  While we don't get a test.d for the result here for cc0,
+     we get a sequence of insns: a move, a "not" and a shift of the
+     subtraction-result, where a simple "spl" would have done. */
+  return c >= 0;
+}

gcc/testsuite/gcc.target/cris/pr93372-5.c

+/* Check that eliminable compare-instructions are eliminated. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-not "\tcmp|\ttest|\tor" { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-not "\tnot" { xfail cc0 } } } */
+/* { dg-final { scan-assembler-not "\tlsr" { xfail cc0 } } } */
+
+int f(long long int a, long long int b, int *d)
+{
+  long long int c = a - b;
+
+  *d = (c == 0LL);
+
+  /* See pr93372-2.c; we have the same problem for DImode, but it's
+     worsened by the generic double-word "optimizations"; or:ing
+     together the DI parts and then testing the result for the equality
+     test.  */
+  return c >= 0LL;
+}

gcc/testsuite/gcc.target/cris/pr93372-8.c

+/* Check that eliminable compare-instructions are eliminated. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* See pr93372-5.c regarding the xfails.  */
+/* { dg-final { scan-assembler-not "\tcmp|\ttest|\tor" { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-not "\tnot" { xfail cc0 } } } */
+/* { dg-final { scan-assembler-not "\tlsr" { xfail cc0 } } } */
+
+int f(long long int a, long long int b, int *d)
+{
+  long long int c = a + b;
+
+  *d = (c == 0);
+
+  return c >= 0;
+}