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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 /arm/PrintAsm.ml | |
| 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 'arm/PrintAsm.ml')
| -rw-r--r-- | arm/PrintAsm.ml | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arm/PrintAsm.ml b/arm/PrintAsm.ml index d700326b..c0e2687b 100644 --- a/arm/PrintAsm.ml +++ b/arm/PrintAsm.ml @@ -599,14 +599,16 @@ let print_instruction oc = function fprintf oc " strb %a, [%a, %a]\n" ireg r1 ireg r2 shift_addr sa; 1 | Pstrh(r1, r2, sa) -> fprintf oc " strh %a, [%a, %a]\n" ireg r1 ireg r2 shift_addr sa; 1 - | Psdiv(r1, r2, r3) -> - assert (r1 = IR0 && r2 = IR0 && r3 = IR1); + | Psdiv -> fprintf oc " bl __aeabi_idiv\n"; 1 + | Psmull(r1, r2, r3, r4) -> + fprintf oc " smull %a, %a, %a, %a\n" ireg r1 ireg r2 ireg r3 ireg r4; 1 | Psub(r1, r2, so) -> fprintf oc " sub %a, %a, %a\n" ireg r1 ireg r2 shift_op so; 1 - | Pudiv(r1, r2, r3) -> - assert (r1 = IR0 && r2 = IR0 && r3 = IR1); + | Pudiv -> fprintf oc " bl __aeabi_uidiv\n"; 1 + | Pumull(r1, r2, r3, r4) -> + fprintf oc " umull %a, %a, %a, %a\n" ireg r1 ireg r2 ireg r3 ireg r4; 1 (* Floating-point coprocessor instructions *) | Pfcpyd(r1, r2) -> fprintf oc " fcpyd %a, %a\n" freg r1 freg r2; 1 |