On 09/23/2015 06:11 PM, Abe wrote:
The patch can pass the bootstrap stage2-to-stage3 comparison [same
platform] *_if_* I prevent the "bootstrap-debug" value for
BUILD_CONFIG from being automatically chosen, e.g. via
"--with-build-config=bootstrap=time" during configuration. With the
default "BUILD_CONFIG=bootstrap-debug", it fails at the comparison
stage.
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.
Jeff
