[gcc r12-1832] Fix PR 101230: ICE in fold_cond_expr_with_comparison

[Andrew Pinski <pinskia@gcc.gnu.org>]

https://gcc.gnu.org/g:37ad257c06d88fdb810be336d212c1ab54b99dad

commit r12-1832-g37ad257c06d88fdb810be336d212c1ab54b99dad
Author: Andrew Pinski <apinski@marvell.com>
Date:   Sun Jun 27 13:14:48 2021 -0700

    Fix PR 101230: ICE in fold_cond_expr_with_comparison
    
    This fixes PR 101230 where I had messed up and forgot that
    invert_tree_comparison can return ERROR_MARK if the comparsion
    is not invertable (floating point types).
    
    Committed as obvious after a bootstrap/test on x86_64-linux-gnu-gnu
    
    gcc/ChangeLog:
    
            PR middle-end/101230
            * fold-const.c (fold_ternary_loc): Check
            the return value of invert_tree_comparison.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/torture/pr101230-1.c: New test.

Diff:
---
 gcc/fold-const.c                          |  9 +++++----
 gcc/testsuite/gcc.dg/torture/pr101230-1.c | 15 +++++++++++++++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index e2110b6bffe..dfccbaec683 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -12837,10 +12837,11 @@ fold_ternary_loc (location_t loc, enum tree_code code, tree type,
 	  tree arg00 = TREE_OPERAND (arg0, 0);
 	  tree arg01 = TREE_OPERAND (arg0, 1);
 	  comp_code = invert_tree_comparison (comp_code, HONOR_NANS (arg00));
-	  tem = fold_cond_expr_with_comparison (loc, type, comp_code,
-						arg00,
-						arg01,
-						op2, op1);
+	  if (comp_code != ERROR_MARK)
+	    tem = fold_cond_expr_with_comparison (loc, type, comp_code,
+						  arg00,
+						  arg01,
+						  op2, op1);
 	  if (tem)
 	    return tem;
 	}
diff --git a/gcc/testsuite/gcc.dg/torture/pr101230-1.c b/gcc/testsuite/gcc.dg/torture/pr101230-1.c
new file mode 100644
index 00000000000..f10ca8b1f49
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr101230-1.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fno-signed-zeros" } */
+
+
+double distance3d_sqr_pt4d_pt4d(void);
+
+int update_r_k_curr_cluster;
+void update_r_k(void) {
+  double curr_distance = distance3d_sqr_pt4d_pt4d();
+  for (int cluster; cluster; cluster++)
+    if (0 < curr_distance) {
+      curr_distance = 0;
+      update_r_k_curr_cluster = cluster;
+    }
+}