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re PR rtl-optimization/88870 (ICE: Segmentation fault (in df_worklist_propagate_backward))

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PR rtl-optimization/88870
	* dce.c (deletable_insn_p): Never delete const/pure calls that can
	throw if we can't alter the cfg or delete dead exceptions.
	(mark_insn): Don't call find_call_stack_args for such calls.

	* gcc.dg/pr88870.c: New test.

From-SVN: r268008
This commit is contained in:
Jakub Jelinek 2019-01-17 09:04:28 +01:00 committed by Jakub Jelinek
parent 404fa41fcf
commit 9556b012b7
4 changed files with 42 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2019-01-17 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/88870
* dce.c (deletable_insn_p): Never delete const/pure calls that can
throw if we can't alter the cfg or delete dead exceptions.
(mark_insn): Don't call find_call_stack_args for such calls.
2019-01-17 Kewen Lin <linkw@gcc.gnu.org>
* doc/extend.texi: Add four new prototypes for vec_ld and seven new

9
gcc/dce.c
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@ -108,7 +108,10 @@ deletable_insn_p (rtx_insn *insn, bool fast, bitmap arg_stores)
/* We can delete dead const or pure calls as long as they do not
infinite loop. */
&& (RTL_CONST_OR_PURE_CALL_P (insn)
&& !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn)))
&& !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn))
/* Don't delete calls that may throw if we cannot do so. */
&& ((cfun->can_delete_dead_exceptions && can_alter_cfg)
|| insn_nothrow_p (insn)))
return find_call_stack_args (as_a <rtx_call_insn *> (insn), false,
fast, arg_stores);
@ -201,7 +204,9 @@ mark_insn (rtx_insn *insn, bool fast)
&& !df_in_progress
&& !SIBLING_CALL_P (insn)
&& (RTL_CONST_OR_PURE_CALL_P (insn)
&& !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn)))
&& !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn))
&& ((cfun->can_delete_dead_exceptions && can_alter_cfg)
|| insn_nothrow_p (insn)))
find_call_stack_args (as_a <rtx_call_insn *> (insn), true, fast, NULL);
}
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-01-17 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/88870
* gcc.dg/pr88870.c: New test.
2019-01-17 Kewen Lin <linkw@gcc.gnu.org>
* gcc.target/powerpc/altivec_vld_vst_addr.c: New test.

23
gcc/testsuite/gcc.dg/pr88870.c Normal file
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@ -0,0 +1,23 @@
/* PR rtl-optimization/88870 */
/* { dg-do compile } */
/* { dg-options "-O1 -fexceptions -fnon-call-exceptions -ftrapv -fno-tree-dominator-opts" } */
int a, b;
void
foo (int *x)
{
int c = 0;
{
int d;
x = &c;
for (;;)
{
x = &d;
b = 0;
d = c + 1;
b = c = 1;
++a;
}
}
}