[PATCH] Fix PR 109919: ICE in emit_move_insn with some bit tests

[Andrew Pinski via Gcc-patches]

The problem is I used expand_expr with the target but
we don't want to use the target here as it is the wrong
mode for the original expression. The testcase would ICE
deap down while trying to do a move to use the target.
Anyways just calling expand_expr with NULL_EXPR fixes
the issue.

Committed as obvious after a bootstrap/test on x86_64-linux-gnu.

        PR middle-end/109919

gcc/ChangeLog:

        * expr.cc (expand_single_bit_test): Don't use the
        target for expand_expr.

gcc/testsuite/ChangeLog:

        * gcc.c-torture/compile/pr109919-1.c: New test.
---
 gcc/expr.cc                                      | 2 +-
 gcc/testsuite/gcc.c-torture/compile/pr109919-1.c | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.c-torture/compile/pr109919-1.c

diff --git a/gcc/expr.cc b/gcc/expr.cc
index 2070198acda..02f24c00148 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -12956,7 +12956,7 @@ expand_single_bit_test (location_t loc, enum tree_code 
code,
   intermediate_type = ops_unsigned ? unsigned_type : signed_type;
   inner = fold_convert_loc (loc, intermediate_type, inner);
 
-  rtx inner0 = expand_expr (inner, target, VOIDmode, EXPAND_NORMAL);
+  rtx inner0 = expand_expr (inner, NULL_RTX, VOIDmode, EXPAND_NORMAL);
 
   inner0 = extract_bit_field (inner0, 1, bitnum, 1, target,
                              operand_mode, mode, 0, NULL);
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr109919-1.c 
b/gcc/testsuite/gcc.c-torture/compile/pr109919-1.c
new file mode 100644
index 00000000000..bb612a1f020
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr109919-1.c
@@ -0,0 +1,9 @@
+/* { dg-options "-fno-tree-dce -fno-tree-vrp" } */
+int a;
+int main() {
+  int b = 1;
+  while (a) {
+    short c = b && ((a || a) & (a * c));
+  }
+  return 0;
+}
-- 
2.31.1