[Qemu-devel] [PATCH v2 1/3] tcg: mark set_label with TCG_OPF_BB_END flag

[Aurelien Jarno]

set_label is effectively the end of a basic bloc, as no optimization
can be made accross it. It was treated as such in the liveness analysis
code, but as a special case.

Mark it with TCG_OPF_BB_END flag so that this information can be used
by other parts of the TCG code, and remove the special case in the liveness
analysis code.

Cc: Blue Swirl <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
---
 tcg/tcg-opc.h |    2 +-
 tcg/tcg.c     |    5 -----
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/tcg/tcg-opc.h b/tcg/tcg-opc.h
index 8e06d03..d12e8d0 100644
--- a/tcg/tcg-opc.h
+++ b/tcg/tcg-opc.h
@@ -36,7 +36,7 @@ DEF(nopn, 0, 0, 1, 0) /* variable number of parameters */
 
 DEF(discard, 1, 0, 0, 0)
 
-DEF(set_label, 0, 0, 1, 0)
+DEF(set_label, 0, 0, 1, TCG_OPF_BB_END)
 DEF(call, 0, 1, 2, TCG_OPF_SIDE_EFFECTS) /* variable number of parameters */
 DEF(jmp, 0, 1, 0, TCG_OPF_BB_END | TCG_OPF_SIDE_EFFECTS)
 DEF(br, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_SIDE_EFFECTS)
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 8386b70..c002a88 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1297,11 +1297,6 @@ static void tcg_liveness_analysis(TCGContext *s)
                 args--;
             }
             break;
-        case INDEX_op_set_label:
-            args--;
-            /* mark end of basic block */
-            tcg_la_bb_end(s, dead_temps);
-            break;
         case INDEX_op_debug_insn_start:
             args -= def->nb_args;
             break;
-- 
1.7.10.4