copy_rtx avoids duplicating DEBUG_EXPRs, so that they map one-to-one to
DEBUG_EXPR_DECLs, but copy_insn lacks these smarts. This was exposed by
a patch I'm working on, that uses RTL flags in DEBUG_EXPRs to speed up
expansion of var location notes within var-tracking.
Regstrapped on i686-pc-linux-gnu and x86_64-linux-gnu. Ok to install?
for gcc/ChangeLog
from Alexandre Oliva <aol...@redhat.com>
* emit-rtl.c (copy_insn_1): Do not copy DEBUG_EXPRs.
Index: gcc/emit-rtl.c
===================================================================
--- gcc/emit-rtl.c.orig 2011-09-15 03:51:41.982777588 -0300
+++ gcc/emit-rtl.c 2011-09-15 03:51:50.767633680 -0300
@@ -5269,6 +5269,7 @@ copy_insn_1 (rtx orig)
switch (code)
{
case REG:
+ case DEBUG_EXPR:
case CONST_INT:
case CONST_DOUBLE:
case CONST_FIXED:
--
Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/ FSF Latin America board member
Free Software Evangelist Red Hat Brazil Compiler Engineer
