Generate better code for case labels with no code in between.
--
Zdenek Pavlas
Index: tcc.c
===================================================================
RCS file: /var/cvs/tinycc/tcc.c,v
retrieving revision 1.1.1.1
diff -u -b -B -w -p -r1.1.1.1 tcc.c
--- tcc.c 15 Jun 2007 14:29:47 -0000 1.1.1.1
+++ tcc.c 15 Jun 2007 14:43:48 -0000
@@ -7371,6 +7371,9 @@ static void block(int *bsym, int *csym,
int v1, v2;
if (!case_sym)
expect("switch");
+ /* since a case is like a label, we must skip it with a jmp */
+ b = gjmp(0);
+ next_case:
next();
v1 = expr_const();
v2 = v1;
@@ -7380,24 +7383,26 @@ static void block(int *bsym, int *csym,
if (v2 < v1)
warning("empty case range");
}
- /* since a case is like a label, we must skip it with a jmp */
- b = gjmp(0);
gsym(*case_sym);
vseti(case_reg, 0);
vpushi(v1);
if (v1 == v2) {
gen_op(TOK_EQ);
- *case_sym = gtst(1, 0);
+ *case_sym = 0;
} else {
gen_op(TOK_GE);
*case_sym = gtst(1, 0);
vseti(case_reg, 0);
vpushi(v2);
gen_op(TOK_LE);
- *case_sym = gtst(1, *case_sym);
}
- gsym(b);
skip(':');
+ if (tok == TOK_CASE) {
+ b = gtst(0, b);
+ goto next_case;
+ }
+ *case_sym = gtst(1, *case_sym);
+ gsym(b);
is_expr = 0;
goto block_after_label;
} else
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