backport: re PR rtl-optimization/87065 (combine causes ICE in trunc_int_for_mode)

	Backported from mainline
	2018-08-27  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/87065
	* combine.c (simplify_if_then_else): Formatting fix.
	(if_then_else_cond): Guard MULT optimization with SCALAR_INT_MODE_P
	check.
	(known_cond): Don't return const_true_rtx for vector modes.  Use
	CONST0_RTX instead of const0_rtx.  Formatting fixes.

	* gcc.target/i386/pr87065.c: New test.

From-SVN: r265110

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8363ff2640631756e9574ee4095ba88c30c70841..b3d278d37ae8a7227c84b12acb18f63e7317c0f1 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,15 @@
 2018-10-12  Jakub Jelinek  <jakub@redhat.com>
 
        Backported from mainline
+       2018-08-27  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/87065
+       * combine.c (simplify_if_then_else): Formatting fix.
+       (if_then_else_cond): Guard MULT optimization with SCALAR_INT_MODE_P
+       check.
+       (known_cond): Don't return const_true_rtx for vector modes.  Use
+       CONST0_RTX instead of const0_rtx.  Formatting fixes.
+
        2018-07-24  Jakub Jelinek  <jakub@redhat.com>
 
        PR middle-end/86627

diff --git a/gcc/combine.c b/gcc/combine.c
index 81c40d84fa98cdbc754578eda1adff17e5476496..8da96d23cc8d1cf8da2f0a3c63d62ecb66e9566f 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6333,7 +6333,7 @@ simplify_if_then_else (rtx x)
                          pc_rtx, pc_rtx, 0, 0, 0);
       if (reg_mentioned_p (from, false_rtx))
        false_rtx = subst (known_cond (copy_rtx (false_rtx), false_code,
-                                  from, false_val),
+                                      from, false_val),
                           pc_rtx, pc_rtx, 0, 0, 0);
 
       SUBST (XEXP (x, 1), swapped ? false_rtx : true_rtx);
@@ -9187,6 +9187,7 @@ if_then_else_cond (rtx x, rtx *ptrue, rtx *pfalse)
 
          if (COMPARISON_P (cond0)
              && COMPARISON_P (cond1)
+             && SCALAR_INT_MODE_P (mode)
              && ((GET_CODE (cond0) == reversed_comparison_code (cond1, NULL)
                   && rtx_equal_p (XEXP (cond0, 0), XEXP (cond1, 0))
                   && rtx_equal_p (XEXP (cond0, 1), XEXP (cond1, 1)))
@@ -9335,12 +9336,12 @@ known_cond (rtx x, enum rtx_code cond, rtx reg, rtx val)
          if (COMPARISON_P (x))
            {
              if (comparison_dominates_p (cond, code))
-               return const_true_rtx;
+               return VECTOR_MODE_P (GET_MODE (x)) ? x : const_true_rtx;
 
              code = reversed_comparison_code (x, NULL);
              if (code != UNKNOWN
                  && comparison_dominates_p (cond, code))
-               return const0_rtx;
+               return CONST0_RTX (GET_MODE (x));
              else
                return x;
            }
@@ -9383,7 +9384,7 @@ known_cond (rtx x, enum rtx_code cond, rtx reg, rtx val)
          /* We must simplify subreg here, before we lose track of the
             original inner_mode.  */
          new_rtx = simplify_subreg (GET_MODE (x), r,
-                                inner_mode, SUBREG_BYTE (x));
+                                    inner_mode, SUBREG_BYTE (x));
          if (new_rtx)
            return new_rtx;
          else
@@ -9408,7 +9409,7 @@ known_cond (rtx x, enum rtx_code cond, rtx reg, rtx val)
          /* We must simplify the zero_extend here, before we lose
             track of the original inner_mode.  */
          new_rtx = simplify_unary_operation (ZERO_EXTEND, GET_MODE (x),
-                                         r, inner_mode);
+                                             r, inner_mode);
          if (new_rtx)
            return new_rtx;
          else

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c9f55dda7527ffa81467fab49c4935d1d31a4523..db1689ab8b1b2541b21e2fcd8f55ffb06f65bf2f 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,6 +1,11 @@
 2018-10-12  Jakub Jelinek  <jakub@redhat.com>
 
        Backported from mainline
+       2018-08-27  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/87065
+       * gcc.target/i386/pr87065.c: New test.
+
        2018-07-24  Jakub Jelinek  <jakub@redhat.com>
 
        PR middle-end/86627

diff --git a/gcc/testsuite/gcc.target/i386/pr87065.c b/gcc/testsuite/gcc.target/i386/pr87065.c
new file mode 100644 (file)
index 0000000..f1cc6f9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr87065.c
@@ -0,0 +1,22 @@
+/* PR rtl-optimization/87065 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -mxop -mprefer-avx128" } */
+
+int a, c, d, e;
+short *b;
+
+void
+foo (void)
+{
+  short *g = b;
+  int h = 1;
+  unsigned i;
+  for (; h <= 1; h++)
+    g = (short *) &c;
+  for (; c; c++)
+    {
+      for (; i <= 1; i++)
+       ;
+      a ^= (a > 0 <= i) + ((e += d) == 0 ?: (*g = 8));
+    }
+}