compiler

commit 4cd1ee5128c84d7e314e5f1d0005e0eacf8d1a88
parent 6084d79dbeefec3cfbf04e626ac58d91d2dd5fbb
Author: Brian Swetland <swetland@frotz.net>
Date:   Sat,  4 Dec 2021 21:40:03 -0800

compiler2: codeflow for while loops

Diffstat:
M
src/codegen-risc5-simple.c
 | 
8
+++++---

1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/codegen-risc5-simple.c b/src/codegen-risc5-simple.c
@@ -362,12 +362,14 @@ void gen_while(Ast node) {
 
 	loop_continue = ctx.pc;
 	u32 r = gen_expr(node->child);
-	put_reg(r);
 
-	// XXX flow
+	emit_mov(R11, r); // set z flag
+	put_reg(r);
+	gen_branch_fwd(EQ, &list);
 
 	gen_block(node->child->next);
-	emit_br(AL, loop_continue);
+
+	gen_branch(AL, loop_continue);
 
 	// patch breaks
 	fixup_branches_fwd(loop_exit->next);