From 12c18155f6a11afe4d1d4e88f6605818276e3a92 Mon Sep 17 00:00:00 2001
From: Ben Gamari <ben@smart-cactus.org>
Date: Mon, 16 Dec 2019 21:29:04 +0000
Subject: [PATCH] rts/Updates: Set prediction of stg_upd_frame_info branch
This is a very important branch yet it didn't have any prediction set.
We predict the updated thunk to live in the young generation since this
is how the original code predicted.
---
rts/Updates.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/rts/Updates.h b/rts/Updates.h
index 91d1b0b1cbd6..029e43f80870 100644
--- a/rts/Updates.h
+++ b/rts/Updates.h
@@ -58,7 +58,7 @@
SET_INFO(p1, stg_BLACKHOLE_info); \
LDV_RECORD_CREATE(p1); \
bd = Bdescr(p1); \
- if (bdescr_gen_no(bd) != 0 :: bits16) { \
+ if (bdescr_gen_no(bd) != 0 :: bits16) (likely: False) { \
recordMutableCap(p1, TO_W_(bdescr_gen_no(bd))); \
TICK_UPD_OLD_IND(); \
and_then; \
--
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