On 09/25/2015 01:18 PM, Segher Boessenkool wrote:
On Fri, Sep 25, 2015 at 10:09:23AM -0600, Jeff Law wrote:
So what that means is the presence or absence of debug information is
causing a difference in
the code you generate. That is (of course) bad and indicates a bug
of some kind in your code.
I haven't put your code under a debugger or anything like that, but
this does jump out:
+ rtx_insn* temp_src_insn = BB_HEAD (then_bb);
+ if (temp_src_insn && NOTE_INSN_BASIC_BLOCK_P (temp_src_insn))
+ temp_src_insn = NEXT_INSN (temp_src_insn); /* skip over a
start-of-BB note */
What if BB_HEAD (then_bb) is a DEBUG_INSN with -g enabled, but is a
NOTE_INSN_BASIC_BLOCK when -g is not enabled. That could cause
this kind of failure.
I haven't looked at the full code, but NEXT_INSN is even more suspicious
(you also need to skip the debug insns).
Yes, you're absolutely right. :-)
jeff
