From 41b7ecb127b93b1aecc29a298ec21dc94603e6fa Mon Sep 17 00:00:00 2001 From: xleroy Date: Mon, 29 Jul 2013 12:10:11 +0000 Subject: 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 --- arm/PrintAsm.ml | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'arm/PrintAsm.ml') 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 -- cgit