From ff3f9aa6ba4a2f56a3cb0c4532ce0460c834ba6d Mon Sep 17 00:00:00 2001
From: Edmund Grimley Evans <Edmund.Grimley.Evans@gmail.com>
Date: Fri, 20 Feb 2015 23:16:00 +0000
Subject: [PATCH] Fix handling of case_reg in switch statement.

The back end functions gen_op(comparison) and gtst() might allocate
registers so case_reg should be left on the value stack while they
are called and set again afterwards.
---
 tccgen.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tccgen.c b/tccgen.c
index d456a2a..510051a 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -4883,6 +4883,7 @@ static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
         b = gjmp(0);
         gsym(*case_sym);
         vseti(case_reg, 0);
+        vdup();
         vpushi(v1);
         if (v1 == v2) {
             gen_op(TOK_EQ);
@@ -4895,6 +4896,8 @@ static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
             gen_op(TOK_LE);
             *case_sym = gtst(1, *case_sym);
         }
+        case_reg = gv(RC_INT);
+        vpop();
         gsym(b);
         skip(':');
         is_expr = 0;