Looking at the regor.c code I came across the function
try_merge_delay_insns().
There around the line 1488 we will find the following code:
merged_insns = gen_rtx_INSN_LIST (SImode, dtrial,
merged_insns);
Please note that in literally *all* other cases the gen_rtx_INSN_LIST
function is supposed to take an enum reg_note as first argument and
not the somehow arbitrary value SImode. All subsequent rtx tree
processing
is assuming that in case of instruction lists we have a reg_note
present in
this field.
I assume therefore that the value REG_DEP_TRUE should be assed as
first argument
to gen_rtx_INSN_LIST there. I think only the fact that the code in
question
isn't likely to trigger didn't make this occur immediately as a bug.
Is this analysis correct?
Marcin Dalecki
