[gcc r13-5556] gccrs: backend: correctly formulate the exit condition ...

[gcc r13-5556] gccrs: backend: correctly formulate the exit condition ...

[Arthur Cohen]

https://gcc.gnu.org/g:e6a3886a833a0c499ab20a828ffae79076d47a4d

commit r13-5556-ge6a3886a833a0c499ab20a828ffae79076d47a4d
Author: liushuyu <liushuyu011@gmail.com>
Date:   Mon Sep 5 17:56:03 2022 -0600

    gccrs: backend: correctly formulate the exit condition ...
    
    ... previously the exit condition was treated the same as the loop
    condition (which is the inverse condition of the exit condition). Now
    this is corrected.
    
    gcc/rust/ChangeLog:
    
            * backend/rust-compile-expr.cc (CompileExpr::visit): Properly formulate
            exit condition when compiling while loops.
    
    Signed-off-by: Zixing Liu <liushuyu011@gmail.com>

Diff:
---
 gcc/rust/backend/rust-compile-expr.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/backend/rust-compile-expr.cc b/gcc/rust/backend/rust-compile-expr.cc
index ea146731cbe..d58e2258947 100644
--- a/gcc/rust/backend/rust-compile-expr.cc
+++ b/gcc/rust/backend/rust-compile-expr.cc
@@ -727,8 +727,11 @@ CompileExpr::visit (HIR::WhileLoopExpr &expr)
 
   tree condition
     = CompileExpr::Compile (expr.get_predicate_expr ().get (), ctx);
+  tree exit_condition
+    = fold_build1_loc (expr.get_locus ().gcc_location (), TRUTH_NOT_EXPR,
+		       boolean_type_node, condition);
   tree exit_expr
-    = ctx->get_backend ()->exit_expression (condition, expr.get_locus ());
+    = ctx->get_backend ()->exit_expression (exit_condition, expr.get_locus ());
   ctx->add_statement (exit_expr);
 
   tree code_block_stmt