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Don't skip prologue/epilogue when initializing alias. 

Register might be modified in prologue/epilogue, which shouldn't
be skipped in alias info analysis.

2021-07-28  Bin Cheng  <bin.cheng@linux.alibaba.com>

gcc/
	* alias.c (init_alias_analysis): Don't skip prologue/epilogue.
This commit is contained in:
Bin Cheng 2021-07-28 17:44:35 +08:00
parent 88d0f70a32
commit 0f95c6b2f7
1 changed files with 0 additions and 12 deletions
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12
gcc/alias.c
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@ -3406,14 +3406,6 @@ init_alias_analysis (void)
rpo = XNEWVEC (int, n_basic_blocks_for_fn (cfun));
rpo_cnt = pre_and_rev_post_order_compute (NULL, rpo, false);
/* The prologue/epilogue insns are not threaded onto the
insn chain until after reload has completed. Thus,
there is no sense wasting time checking if INSN is in
the prologue/epilogue until after reload has completed. */
bool could_be_prologue_epilogue = ((targetm.have_prologue ()
|| targetm.have_epilogue ())
&& reload_completed);
pass = 0;
do
{
@ -3459,10 +3451,6 @@ init_alias_analysis (void)
{
rtx note, set;
if (could_be_prologue_epilogue
&& prologue_epilogue_contains (insn))
continue;
/* If this insn has a noalias note, process it, Otherwise,
scan for sets. A simple set will have no side effects
which could change the base value of any other register. */