[PATCH 2/2] [SPARC] Recognize the load when accessing the GOT

[Daniel Cederman]

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

gcc/ChangeLog:

2017-11-27  Daniel Cederman  <ceder...@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.
---
 gcc/config/sparc/sparc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index 6e91114..8b11c1a 100644
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -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;
            }
        }
 
-- 
2.9.3