qemu/0041-tcg-mark-set_label-with-TCG_OPF_BB_END-flag.patch

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2012-10-28 18:05:07 +00:00
From 1610a0e56c0be3e4bfd3034e5323188b1d05badd Mon Sep 17 00:00:00 2001
From: Aurelien Jarno <aurelien@aurel32.net>
Date: Mon, 10 Sep 2012 14:23:49 +0200
Subject: [PATCH] tcg: mark set_label with TCG_OPF_BB_END flag
set_label is effectively the end of a basic block, 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 <blauwirbel@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
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;