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authorQuentin Carbonneaux <quentin.carbonneaux@yale.edu>2015-08-22 16:02:12 -0400
committerQuentin Carbonneaux <quentin.carbonneaux@yale.edu>2015-09-15 23:01:32 -0400
commit390c5addd6c59075066138547285c17a9d3f49d9 (patch)
treef10d184b41cb97347eeb811918061f76e819d015
parent1eb875882480c83787507f2668fae6e58094444c (diff)
downloadroux-390c5addd6c59075066138547285c17a9d3f49d9.tar.gz
output labels only when necessary
-rw-r--r--lisc/emit.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/lisc/emit.c b/lisc/emit.c
index 278f579..140edab 100644
--- a/lisc/emit.c
+++ b/lisc/emit.c
@@ -319,8 +319,17 @@ emitfn(Fn *fn, FILE *f)
 	fs = framesz(fn);
 	if (fs)
 		fprintf(f, "\tsub $%d, %%rsp\n", fs);
+	for (b=fn->start; b; b=b->link)
+		b->visit = 0;
 	for (b=fn->start; b; b=b->link) {
-		fprintf(f, ".L%s:\n", b->name);
+		if (b->s1 && b->link != b->s1)
+			b->s1->visit++;
+		if (b->s2 && b->link != b->s2)
+			b->s2->visit++;
+	}
+	for (b=fn->start; b; b=b->link) {
+		if (b->visit != 0)
+			fprintf(f, ".L%s:\n", b->name);
 		for (i=b->ins; i-b->ins < b->nins; i++)
 			eins(*i, fn, f);
 		switch (b->jmp.type) {