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builtins.c (expand_builtin_setjmp_receiver): Use and clobber hard_frame_pointer_rtx.

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gcc/
	* builtins.c (expand_builtin_setjmp_receiver): Use and clobber
	hard_frame_pointer_rtx.
	* cse.c (cse_insn): Remove volatile check.
	* cselib.c (cselib_process_insn): Likewise.
	* dse.c (scan_insn): Likewise.

From-SVN: r208498
This commit is contained in:
Richard Sandiford 2014-03-11 21:35:02 +00:00 committed by Richard Sandiford
parent 5af1876c65
commit f12572682e
5 changed files with 31 additions and 32 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2014-03-11 Richard Sandiford <rdsandiford@googlemail.com>
* builtins.c (expand_builtin_setjmp_receiver): Use and clobber
hard_frame_pointer_rtx.
* cse.c (cse_insn): Remove volatile check.
* cselib.c (cselib_process_insn): Likewise.
* dse.c (scan_insn): Likewise.
2014-03-11 Joern Rennecke <joern.rennecke@embecosm.com>
* config/arc/arc.c (conditionalize_nonjump): New function, broken

34
gcc/builtins.c
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@ -910,18 +910,27 @@ expand_builtin_setjmp_receiver (rtx receiver_label ATTRIBUTE_UNUSED)
#ifdef HAVE_nonlocal_goto
if (! HAVE_nonlocal_goto)
#endif
/* First adjust our frame pointer to its actual value. It was
previously set to the start of the virtual area corresponding to
the stacked variables when we branched here and now needs to be
adjusted to the actual hardware fp value.
{
/* First adjust our frame pointer to its actual value. It was
previously set to the start of the virtual area corresponding to
the stacked variables when we branched here and now needs to be
adjusted to the actual hardware fp value.
Assignments to virtual registers are converted by
instantiate_virtual_regs into the corresponding assignment
to the underlying register (fp in this case) that makes
the original assignment true.
So the following insn will actually be decrementing fp by
STARTING_FRAME_OFFSET. */
emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
Assignments to virtual registers are converted by
instantiate_virtual_regs into the corresponding assignment
to the underlying register (fp in this case) that makes
the original assignment true.
So the following insn will actually be decrementing fp by
STARTING_FRAME_OFFSET. */
emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
/* Restoring the frame pointer also modifies the hard frame pointer.
Mark it used (so that the previous assignment remains live once
the frame pointer is eliminated) and clobbered (to represent the
implicit update from the assignment). */
emit_use (hard_frame_pointer_rtx);
emit_clobber (hard_frame_pointer_rtx);
}
#if !HARD_FRAME_POINTER_IS_ARG_POINTER
if (fixed_regs[ARG_POINTER_REGNUM])
@ -965,8 +974,7 @@ expand_builtin_setjmp_receiver (rtx receiver_label ATTRIBUTE_UNUSED)
/* We must not allow the code we just generated to be reordered by
scheduling. Specifically, the update of the frame pointer must
happen immediately, not later. Similarly, we must block
(frame-related) register values to be used across this code. */
happen immediately, not later. */
emit_insn (gen_blockage ());
}

5
gcc/cse.c
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@ -5682,11 +5682,6 @@ cse_insn (rtx insn)
invalidate (XEXP (dest, 0), GET_MODE (dest));
}
/* A volatile ASM or an UNSPEC_VOLATILE invalidates everything. */
if (NONJUMP_INSN_P (insn)
&& volatile_insn_p (PATTERN (insn)))
flush_hash_table ();
/* Don't cse over a call to setjmp; on some machines (eg VAX)
the regs restored by the longjmp come from a later time
than the setjmp. */

6
gcc/cselib.c
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@ -2645,12 +2645,10 @@ cselib_process_insn (rtx insn)
cselib_current_insn = insn;
/* Forget everything at a CODE_LABEL, a volatile insn, or a setjmp. */
/* Forget everything at a CODE_LABEL or a setjmp. */
if ((LABEL_P (insn)
|| (CALL_P (insn)
&& find_reg_note (insn, REG_SETJMP, NULL))
|| (NONJUMP_INSN_P (insn)
&& volatile_insn_p (PATTERN (insn))))
&& find_reg_note (insn, REG_SETJMP, NULL)))
&& !cselib_preserve_constants)
{
cselib_reset_table (next_uid);

10
gcc/dse.c
View File

@ -2470,16 +2470,6 @@ scan_insn (bb_info_t bb_info, rtx insn)
return;
}
/* Cselib clears the table for this case, so we have to essentially
do the same. */
if (NONJUMP_INSN_P (insn)
&& volatile_insn_p (PATTERN (insn)))
{
add_wild_read (bb_info);
insn_info->cannot_delete = true;
return;
}
/* Look at all of the uses in the insn. */
note_uses (&PATTERN (insn), check_mem_read_use, bb_info);