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author | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2013-07-29 12:10:11 +0000 |
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committer | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2013-07-29 12:10:11 +0000 |
commit | 41b7ecb127b93b1aecc29a298ec21dc94603e6fa (patch) | |
tree | 287ce1cbf88caf973534715c7816d57b9089b265 /ia32/SelectOp.vp | |
parent | 4bf8b331372388dc9cb39154c986c918df9e071c (diff) | |
download | compcert-41b7ecb127b93b1aecc29a298ec21dc94603e6fa.tar.gz compcert-41b7ecb127b93b1aecc29a298ec21dc94603e6fa.zip |
Optimize integer divisions by positive constants, turning them into
multiply-high and shifts.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2300 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'ia32/SelectOp.vp')
-rw-r--r-- | ia32/SelectOp.vp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/ia32/SelectOp.vp b/ia32/SelectOp.vp index 2d1ab483..209147e3 100644 --- a/ia32/SelectOp.vp +++ b/ia32/SelectOp.vp @@ -299,10 +299,13 @@ Nondetfunction xor (e1: expr) (e2: expr) := (** ** Integer division and modulus *) -Definition divu (e1: expr) (e2: expr) := Eop Odivu (e1:::e2:::Enil). -Definition modu (e1: expr) (e2: expr) := Eop Omodu (e1:::e2:::Enil). -Definition divs (e1: expr) (e2: expr) := Eop Odiv (e1:::e2:::Enil). -Definition mods (e1: expr) (e2: expr) := Eop Omod (e1:::e2:::Enil). +Definition divu_base (e1: expr) (e2: expr) := Eop Odivu (e1:::e2:::Enil). +Definition modu_base (e1: expr) (e2: expr) := Eop Omodu (e1:::e2:::Enil). +Definition divs_base (e1: expr) (e2: expr) := Eop Odiv (e1:::e2:::Enil). +Definition mods_base (e1: expr) (e2: expr) := Eop Omod (e1:::e2:::Enil). + +Definition shrximm (e1: expr) (n2: int) := + if Int.eq n2 Int.zero then e1 else Eop (Oshrximm n2) (e1:::Enil). (** ** General shifts *) |