MemSet() must not cast its pointer argument to int32* until after it has checked that the pointer is actually word-aligned.  Casting a non-aligned pointer to int32* is technically illegal per the C spec, and some recent versions of gcc actually generate bad code for the memset() when given such a pointer.  Per report from Andrew Morrow.
MemSet() must not cast its pointer argument to int32* until after it has
checked that the pointer is actually word-aligned.  Casting a non-aligned
pointer to int32* is technically illegal per the C spec, and some recent
versions of gcc actually generate bad code for the memset() when given
such a pointer.  Per report from Andrew Morrow.

rvs/gpdb,chrishajas/gpdb,edespino/gpdb,ahachete/gpdb,zeroae/postgres-xl,50wu/gpdb,oberstet/postgres-xl,randomtask1155/gpdb,lisakowen/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,adam8157/gpdb,Chibin/gpdb,snaga/postgres-xl,janebeckman/gpdb,cjcjameson/gpdb,rvs/gpdb,ovr/postgres-xl,ashwinstar/gpdb,jmcatamney/gpdb,adam8157/gpdb,royc1/gpdb,Chibin/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,lpetrov-pivotal/gpdb,lintzc/gpdb,tangp3/gpdb,tpostgres-projects/tPostgres,chrishajas/gpdb,cjcjameson/gpdb,Chibin/gpdb,rvs/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,edespino/gpdb,greenplum-db/gpdb,foyzur/gpdb,rubikloud/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,Quikling/gpdb,yuanzhao/gpdb,tangp3/gpdb,rvs/gpdb,0x0FFF/gpdb,tangp3/gpdb,kaknikhil/gpdb,ovr/postgres-xl,edespino/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rubikloud/gpdb,postmind-net/postgres-xl,royc1/gpdb,royc1/gpdb,snaga/postgres-xl,royc1/gpdb,yazun/postgres-xl,zaksoup/gpdb,jmcatamney/gpdb,tpostgres-projects/tPostgres,adam8157/gpdb,Chibin/gpdb,chrishajas/gpdb,tangp3/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,jmcatamney/gpdb,atris/gpdb,rvs/gpdb,janebeckman/gpdb,xuegang/gpdb,ahachete/gpdb,postmind-net/postgres-xl,ashwinstar/gpdb,zeroae/postgres-xl,kaknikhil/gpdb,lintzc/gpdb,techdragon/Postgres-XL,lintzc/gpdb,CraigHarris/gpdb,zeroae/postgres-xl,lpetrov-pivotal/gpdb,50wu/gpdb,lpetrov-pivotal/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,chrishajas/gpdb,Chibin/gpdb,lintzc/gpdb,ahachete/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,oberstet/postgres-xl,postmind-net/postgres-xl,atris/gpdb,ashwinstar/gpdb,foyzur/gpdb,zeroae/postgres-xl,edespino/gpdb,chrishajas/gpdb,cjcjameson/gpdb,rvs/gpdb,xuegang/gpdb,tpostgres-projects/tPostgres,xuegang/gpdb,chrishajas/gpdb,Quikling/gpdb,janebeckman/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,arcivanov/postgres-xl,zaksoup/gpdb,lintzc/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,xuegang/gpdb,lintzc/gpdb,lisakowen/gpdb,0x0FFF/gpdb,tangp3/gpdb,kaknikhil/gpdb,atris/gpdb,Quikling/gpdb,tangp3/gpdb,tangp3/gpdb,yuanzhao/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,postmind-net/postgres-xl,atris/gpdb,atris/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,pavanvd/postgres-xl,50wu/gpdb,techdragon/Postgres-XL,jmcatamney/gpdb,royc1/gpdb,postmind-net/postgres-xl,royc1/gpdb,greenplum-db/gpdb,edespino/gpdb,tpostgres-projects/tPostgres,randomtask1155/gpdb,atris/gpdb,edespino/gpdb,ahachete/gpdb,0x0FFF/gpdb,yuanzhao/gpdb,chrishajas/gpdb,Chibin/gpdb,snaga/postgres-xl,yazun/postgres-xl,lintzc/gpdb,rubikloud/gpdb,CraigHarris/gpdb,edespino/gpdb,xinzweb/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,zaksoup/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,yazun/postgres-xl,randomtask1155/gpdb,snaga/postgres-xl,yuanzhao/gpdb,Quikling/gpdb,atris/gpdb,ovr/postgres-xl,Chibin/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,oberstet/postgres-xl,50wu/gpdb,xinzweb/gpdb,xinzweb/gpdb,rubikloud/gpdb,adam8157/gpdb,ovr/postgres-xl,zaksoup/gpdb,ahachete/gpdb,lpetrov-pivotal/gpdb,greenplum-db/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,Quikling/gpdb,yuanzhao/gpdb,royc1/gpdb,tpostgres-projects/tPostgres,0x0FFF/gpdb,rvs/gpdb,kmjungersen/PostgresXL,techdragon/Postgres-XL,0x0FFF/gpdb,foyzur/gpdb,randomtask1155/gpdb,kaknikhil/gpdb,royc1/gpdb,kaknikhil/gpdb,Chibin/gpdb,jmcatamney/gpdb,chrishajas/gpdb,kmjungersen/PostgresXL,ahachete/gpdb,ahachete/gpdb,Quikling/gpdb,50wu/gpdb,lisakowen/gpdb,foyzur/gpdb,randomtask1155/gpdb,xinzweb/gpdb,Chibin/gpdb,CraigHarris/gpdb,rubikloud/gpdb,xuegang/gpdb,randomtask1155/gpdb,0x0FFF/gpdb,CraigHarris/gpdb,lisakowen/gpdb,ahachete/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,zaksoup/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,edespino/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,adam8157/gpdb,foyzur/gpdb,CraigHarris/gpdb,edespino/gpdb,kmjungersen/PostgresXL,ovr/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,janebeckman/gpdb,janebeckman/gpdb,rubikloud/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,yuanzhao/gpdb,lisakowen/gpdb,CraigHarris/gpdb,xuegang/gpdb,arcivanov/postgres-xl,pavanvd/postgres-xl,oberstet/postgres-xl,atris/gpdb,0x0FFF/gpdb,50wu/gpdb,edespino/gpdb,techdragon/Postgres-XL,rvs/gpdb,cjcjameson/gpdb,yazun/postgres-xl,CraigHarris/gpdb,Chibin/gpdb,adam8157/gpdb,xuegang/gpdb,foyzur/gpdb,50wu/gpdb,lintzc/gpdb,adam8157/gpdb,greenplum-db/gpdb,rubikloud/gpdb,foyzur/gpdb,rvs/gpdb,Quikling/gpdb,snaga/postgres-xl,zaksoup/gpdb,cjcjameson/gpdb,janebeckman/gpdb,arcivanov/postgres-xl,cjcjameson/gpdb,janebeckman/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,kmjungersen/PostgresXL,foyzur/gpdb,Quikling/gpdb,yuanzhao/gpdb,Quikling/gpdb,ashwinstar/gpdb,xuegang/gpdb,Postgres-XL/Postgres-XL,0x0FFF/gpdb,zaksoup/gpdb,randomtask1155/gpdb,50wu/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,adam8157/gpdb,kaknikhil/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,xuegang/gpdb,xinzweb/gpdb,tangp3/gpdb,rubikloud/gpdb,Quikling/gpdb,lintzc/gpdb,rvs/gpdb,CraigHarris/gpdb,xinzweb/gpdb