Merge branch 'rickard/alloc-opt/OTP-7775'

* rickard/alloc-opt/OTP-7775:
  Optimize memory allocation

Conflicts:
	erts/aclocal.m4
	erts/emulator/hipe/hipe_bif_list.m4
	erts/preloaded/ebin/erl_prim_loader.beam
	erts/preloaded/ebin/erlang.beam
	erts/preloaded/ebin/init.beam
	erts/preloaded/ebin/otp_ring0.beam
	erts/preloaded/ebin/prim_file.beam
	erts/preloaded/ebin/prim_inet.beam
	erts/preloaded/ebin/prim_zip.beam
	erts/preloaded/ebin/zlib.beam

1 files changed, 10 insertions, 6 deletions

diff --git a/erts/emulator/beam/erl_bestfit_alloc.c b/erts/emulator/beam/erl_bestfit_alloc.c
index f2199d41a1..c50fdeb4e8 100644
--- a/erts/emulator/beam/erl_bestfit_alloc.c
+++ b/erts/emulator/beam/erl_bestfit_alloc.c
@@ -161,14 +161,18 @@ erts_bfalc_start(BFAllctr_t *bfallctr,
 		 BFAllctrInit_t *bfinit,
 		 AllctrInit_t *init)
 {
-    BFAllctr_t nulled_state = {{0}};
-    /* {{0}} is used instead of {0}, in order to avoid (an incorrect) gcc
-       warning. gcc warns if {0} is used as initializer of a struct when
-       the first member is a struct (not if, for example, the third member
-       is a struct). */
+    struct {
+	int dummy;
+	BFAllctr_t allctr;
+    } zero = {0};
+    /* The struct with a dummy element first is used in order to avoid (an
+       incorrect) gcc warning. gcc warns if {0} is used as initializer of
+       a struct when the first member is a struct (not if, for example,
+       the third member is a struct). */
+
     Allctr_t *allctr = (Allctr_t *) bfallctr;
 
-    sys_memcpy((void *) bfallctr, (void *) &nulled_state, sizeof(BFAllctr_t));
+    sys_memcpy((void *) bfallctr, (void *) &zero.allctr, sizeof(BFAllctr_t));
 
     bfallctr->address_order		= bfinit->ao;