This adds some extra debug info to the dump file for combine: print
the insns that are input to try_combine. I was worried printing more
will make the dump file only harder to read, but especially the info
from the REG_DEAD notes is invaluable.
Committing to trunk.
Segher
2017-11-02 Segher Boessenkool <seg...@kernel.crashing.org>
* combine (try_combine): Print the insns input to try_combine to the
dump file.
---
gcc/combine.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/gcc/combine.c b/gcc/combine.c
index 5782013..910d4b0 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -2797,6 +2797,13 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1,
rtx_insn *i0,
else
fprintf (dump_file, "\nTrying %d -> %d:\n",
INSN_UID (i2), INSN_UID (i3));
+
+ if (i0)
+ dump_insn_slim (dump_file, i0);
+ if (i1)
+ dump_insn_slim (dump_file, i1);
+ dump_insn_slim (dump_file, i2);
+ dump_insn_slim (dump_file, i3);
}
/* If multiple insns feed into one of I2 or I3, they can be in any
--
1.8.3.1
