From: Wolfgang (Blub) Bumiller <blub@speed.at>
Date: Wed, 21 Nov 2012 16:40:35 +0000 (+0100)
Subject: Little optimization to not produce an unreachable goto instruction
X-Git-Tag: 0.1.9~380
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=5a6b2bceb218f5c4b243274db6620604523c9f1e;p=xonotic%2Fgmqcc.git

Little optimization to not produce an unreachable goto instruction
---

diff --git a/ir.c b/ir.c
index bf0a745..232bd69 100644
--- a/ir.c
+++ b/ir.c
@@ -2522,6 +2522,15 @@ tailcall:
                 /* fixup the jump address */
                 code_statements[stidx].o2.s1 = (onfalse->code_start) - (stidx);
                 stmt.opcode = vec_last(code_statements).opcode;
+                if (stmt.opcode == INSTR_GOTO ||
+                    stmt.opcode == INSTR_IF ||
+                    stmt.opcode == INSTR_IFNOT ||
+                    stmt.opcode == INSTR_RETURN ||
+                    stmt.opcode == INSTR_DONE)
+                {
+                    /* no use jumping from here */
+                    return true;
+                }
                 /* may have been generated in the previous recursive call */
                 stmt.opcode = INSTR_GOTO;
                 stmt.o1.s1 = (onfalse->code_start) - vec_size(code_statements);