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[SPARC] Recognize the load when accessing the GOT 

Needed for the UT699 errata workaround to function correctly when
compiling with -fPIC.

2017-11-29  Daniel Cederman  <cederman@gaisler.com>

gcc/
	* config/sparc/sparc.c (sparc_do_work_around_errata): Treat the
        movsi_pic_gotdata_op instruction as a load for the UT699 errata
        workaround.

From-SVN: r255239
This commit is contained in:
Daniel Cederman 2017-11-29 15:45:41 +00:00 committed by Daniel Hellstrom
parent 6f9bc5a70f
commit 9d52da2f21
2 changed files with 13 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-11-29 Daniel Cederman <cederman@gaisler.com>
* config/sparc/sparc.c (sparc_do_work_around_errata): Treat the
movsi_pic_gotdata_op instruction as a load for the UT699 errata
workaround.
2017-11-29 Martin Aberg <maberg@gaisler.com>
* config/sparc/sparc.md (divdf3_fix): Add NOP and adjust length

8
gcc/config/sparc/sparc.c
View File

@ -1321,7 +1321,8 @@ sparc_do_work_around_errata (void)
&& NONJUMP_INSN_P (insn)
&& (set = single_set (insn)) != NULL_RTX
&& GET_MODE_SIZE (GET_MODE (SET_SRC (set))) <= 4
&& mem_ref (SET_SRC (set)) != NULL_RTX
&& (mem_ref (SET_SRC (set)) != NULL_RTX
|| INSN_CODE (insn) == CODE_FOR_movsi_pic_gotdata_op)
&& REG_P (SET_DEST (set))
&& REGNO (SET_DEST (set)) < 32)
{
@ -1359,6 +1360,11 @@ sparc_do_work_around_errata (void)
&& REGNO (src) != REGNO (x)))
&& !reg_mentioned_p (x, XEXP (dest, 0)))
insert_nop = true;
/* GOT accesses uses LD. */
else if (INSN_CODE (next) == CODE_FOR_movsi_pic_gotdata_op
&& !reg_mentioned_p (x, XEXP (XEXP (src, 0), 1)))
insert_nop = true;
}
}