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re PR debug/84875 (ICE in maybe_record_trace_start, at dwarf2cfi.c:2348 on s390x)

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PR debug/84875
	* dce.c (delete_unmarked_insns): Don't remove frame related noop moves
	holding REG_CFA_RESTORE notes, instead turn them into a USE.

	* gcc.dg/pr84875.c: New test.

From-SVN: r258692
This commit is contained in:
Jakub Jelinek 2018-03-20 22:07:13 +01:00 committed by Jakub Jelinek
parent 1efb1dc2d8
commit 6f21dc3c4f
4 changed files with 63 additions and 3 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2018-03-20 Jakub Jelinek <jakub@redhat.com>
PR debug/84875
* dce.c (delete_unmarked_insns): Don't remove frame related noop moves
holding REG_CFA_RESTORE notes, instead turn them into a USE.
2018-03-20 Peter Bergner <bergner@vnet.ibm.com>
PR target/83789

27
gcc/dce.c
View File

@ -569,9 +569,19 @@ delete_unmarked_insns (void)
FOR_BB_INSNS_REVERSE_SAFE (bb, insn, next)
if (NONDEBUG_INSN_P (insn))
{
rtx turn_into_use = NULL_RTX;
/* Always delete no-op moves. */
if (noop_move_p (insn))
;
{
if (RTX_FRAME_RELATED_P (insn))
turn_into_use
= find_reg_note (insn, REG_CFA_RESTORE, NULL);
if (turn_into_use && REG_P (XEXP (turn_into_use, 0)))
turn_into_use = XEXP (turn_into_use, 0);
else
turn_into_use = NULL_RTX;
}
/* Otherwise rely only on the DCE algorithm. */
else if (marked_insn_p (insn))
@ -611,8 +621,19 @@ delete_unmarked_insns (void)
if (CALL_P (insn))
must_clean = true;
/* Now delete the insn. */
delete_insn_and_edges (insn);
if (turn_into_use)
{
/* Don't remove frame related noop moves if they cary
REG_CFA_RESTORE note, while we don't need to emit any code,
we need it to emit the CFI restore note. */
PATTERN (insn)
= gen_rtx_USE (GET_MODE (turn_into_use), turn_into_use);
INSN_CODE (insn) = -1;
df_insn_rescan (insn);
}
else
/* Now delete the insn. */
delete_insn_and_edges (insn);
}
/* Deleted a pure or const call. */

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2018-03-20 Jakub Jelinek <jakub@redhat.com>
PR debug/84875
* gcc.dg/pr84875.c: New test.
2018-03-20 Marek Polacek <polacek@redhat.com>
PR c++/84978, ICE with NRVO.

28
gcc/testsuite/gcc.dg/pr84875.c Normal file
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@ -0,0 +1,28 @@
/* PR debug/84875 */
/* { dg-do compile } */
/* { dg-options "-Os" } */
/* { dg-additional-options "-fpie" { target pie } } */
/* { dg-additional-options "-march=z196" { target s390*-*-* } } */
static long *a[100];
static int b[100];
long *c;
int d;
void foo (long *);
void
bar ()
{
long *g = c;
g--;
d = *g;
if (d)
if (b[d] < 8)
{
*(void **)g = a[d];
a[d] = g;
b[d]++;
return;
}
foo (g);
}