From: Jeff Law <law@redhat.com>
Date: Mon, 23 Mar 2020 23:55:20 +0000 (-0600)
Subject: Verify the code used for the optimized comparison is valid for the comparison's mode.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=75fb811dfaa29d60a897924b0d1629577b90eee7;p=gcc.git

Verify the code used for the optimized comparison is valid for the comparison's mode.

	PR rtl-optimization/90275
	PR target/94238
	PR target/94144
	* simplify-rtx.c (comparison_code_valid_for_mode): New function.
	(simplify_logical_relational_operation): Use it.

	PR target/94144
	PR target/94238
	* gcc.c-torture/compile/pr94144.c: New test.
	* gcc.c-torture/compile/pr94238.c: New test.
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9ba58273c21..3b926703957 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2020-03-23  Jeff Law  <law@redhat.com>
+
+	PR rtl-optimization/90275
+	PR target/94238
+	PR target/94144
+	* simplify-rtx.c (comparison_code_valid_for_mode): New function.
+	(simplify_logical_relational_operation): Use it.
+
 2020-03-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/91993
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index dd3d85156c3..28c2dc69ae7 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -2215,6 +2215,53 @@ mask_to_comparison (int mask)
     }
 }
 
+/* Return true if CODE is valid for comparisons of mode MODE, false
+   otherwise.
+
+   It is always safe to return false, even if the code was valid for the
+   given mode as that will merely suppress optimizations.  */
+
+static bool
+comparison_code_valid_for_mode (enum rtx_code code, enum machine_mode mode)
+{
+  switch (code)
+    {
+      /* These are valid for integral, floating and vector modes.  */
+      case NE:
+      case EQ:
+      case GE:
+      case GT:
+      case LE:
+      case LT:
+	return (INTEGRAL_MODE_P (mode)
+		|| FLOAT_MODE_P (mode)
+		|| VECTOR_MODE_P (mode));
+
+      /* These are valid for floating point modes.  */
+      case LTGT:
+      case UNORDERED:
+      case ORDERED:
+      case UNEQ:
+      case UNGE:
+      case UNGT:
+      case UNLE:
+      case UNLT:
+	return FLOAT_MODE_P (mode);
+
+      /* These are filtered out in simplify_logical_operation, but
+	 we check for them too as a matter of safety.   They are valid
+	 for integral and vector modes.  */
+      case GEU:
+      case GTU:
+      case LEU:
+      case LTU:
+	return INTEGRAL_MODE_P (mode) || VECTOR_MODE_P (mode);
+
+      default:
+	gcc_unreachable ();
+    }
+}
+				       
 /* Simplify a logical operation CODE with result mode MODE, operating on OP0
    and OP1, which should be both relational operations.  Return 0 if no such
    simplification is possible.  */
@@ -2252,6 +2299,10 @@ simplify_logical_relational_operation (enum rtx_code code, machine_mode mode,
 
   code = mask_to_comparison (mask);
 
+  /* Many comparison codes are only valid for certain mode classes.  */
+  if (!comparison_code_valid_for_mode (code, mode))
+    return 0;
+
   op0 = XEXP (op1, 0);
   op1 = XEXP (op1, 1);
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5f079f1fca9..28adfd8b580 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2020-03-23  Jeff Law  <law@redhat.com>
+
+	PR target/94144
+	PR target/94238
+	* gcc.c-torture/compile/pr94144.c: New test.
+	* gcc.c-torture/compile/pr94238.c: New test.
+	
 2020-03-23  Patrick Palka  <ppalka@redhat.com>
 
 	PR c++/93805
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr94144.c b/gcc/testsuite/gcc.c-torture/compile/pr94144.c
new file mode 100644
index 00000000000..4358e0a7b00
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr94144.c
@@ -0,0 +1,18 @@
+
+int a, b, z;
+int c(int d, int e) { return d && e > 0 && d > 5 - e ? 0 : d + e; }
+int k();
+void h(int);
+void f(short d) {
+  int g = !(0 < d);
+  h(d);
+  if (b) {
+    unsigned i[1];
+    i[0] = g = 0;
+    for (; g <= 8; g++)
+      d || k();
+    if (c(!(i[0] <= z) >= d, d) != a)
+      k();
+  }
+}
+
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr94238.c b/gcc/testsuite/gcc.c-torture/compile/pr94238.c
new file mode 100644
index 00000000000..5a96a64d85b
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr94238.c
@@ -0,0 +1,22 @@
+enum { false, true } a;
+int b, c, d, e, f;
+int fn3();
+void fn2();
+
+void fn1() {
+  _Bool g, h = false, i = false;
+  int j;
+  c = b && f || d;
+  if (c) {
+    if (d)
+      i = true;
+    _Bool k = b;
+    int l = e, m = a;
+    g = k && l < m || l > m;
+  }
+  if (g)
+    h = true;
+  if (i)
+    fn2();
+  h &&j &&fn3();
+}