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compiler.cfg.branch-splitting: now that we do SSA construction we can split branches with fixnum overflow ops (which have a live-out)

db4
Slava Pestov 2009-07-23 18:02:29 -05:00
parent 7f87335afe
commit 93c58a8bb5
1 changed files with 2 additions and 15 deletions
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17
basis/compiler/cfg/branch-splitting/branch-splitting.factor
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@ -6,18 +6,8 @@ compiler.cfg.def-use compiler.cfg compiler.cfg.rpo
compiler.cfg.renaming compiler.cfg.instructions compiler.cfg.utilities ;
IN: compiler.cfg.branch-splitting
: clone-renamings ( insns -- assoc )
[ defs-vregs ] map concat [ dup fresh-vreg ] H{ } map>assoc ;
: clone-instructions ( insns -- insns' )
dup clone-renamings renamings [
[
clone
dup rename-insn-defs
dup rename-insn-uses
dup fresh-insn-temps
] map
] with-variable ;
[ clone dup fresh-insn-temps ] map ;
: clone-basic-block ( bb -- bb' )
! The new block gets the same RPO number as the old one.
@ -62,10 +52,7 @@ IN: compiler.cfg.branch-splitting
UNION: irrelevant ##peek ##replace ##inc-d ##inc-r ;
: split-instructions? ( insns -- ? )
[ [ irrelevant? not ] count 5 <= ]
[ last ##fixnum-overflow? not ]
bi and ;
: split-instructions? ( insns -- ? ) [ irrelevant? not ] count 5 <= ;
: split-branch? ( bb -- ? )
{