Make output_insn() tell where it was called from, and avoid

doing unnecessary register->sameregister moves.

1 files changed, 7 insertions, 0 deletions

diff --git a/example.c b/example.c
index 9b943b7..d4f4c32 100644
--- a/example.c
+++ b/example.c
@@ -262,6 +262,9 @@ static void output_insn(struct bb_state *state, const char *fmt, ...)
 	output_line(state, "\t%s\n", buffer);
 }
 
+#define output_insn(state, fmt, arg...) \
+	output_insn(state, fmt "\t\t# %s" , ## arg , __FUNCTION__)
+
 static void output_comment(struct bb_state *state, const char *fmt, ...)
 {
 	static char buffer[512];
@@ -647,6 +650,10 @@ static struct hardreg *copy_reg(struct bb_state *state, struct hardreg *src, pse
 	int i;
 	struct hardreg *reg;
 
+	/* If the container has been killed off, just re-use it */
+	if (!src->contains)
+		return src;
+
 	/* If "src" only has one user, and the contents are dead, we can re-use it */
 	if (src->busy == 1 && src->dead == 1)
 		return src;