PATCH: H8/300 BRANCH_COST fix
tm
tm@mail.kloo.net
Wed Apr 24 17:59:00 GMT 2002
Branches are not free on the H8/300! (would be nice, though)
Toshi
2002-04-24 Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com>
* config/h8300/h8300.h (BRANCH_COST): Fix cost
*** h8300.h.orig Wed Apr 24 16:55:32 2002
--- h8300.h Wed Apr 24 17:00:27 2002
*************** struct cum_arg
*** 999,1005 ****
#define DEFAULT_RTX_COSTS(RTX, CODE, OUTER_CODE) \
return (const_costs (RTX, CODE, OUTER_CODE));
! #define BRANCH_COST 0
/* We say that MOD and DIV are so cheap because otherwise we'll
generate some really horrible code for division of a power of two. */
--- 999,1008 ----
#define DEFAULT_RTX_COSTS(RTX, CODE, OUTER_CODE) \
return (const_costs (RTX, CODE, OUTER_CODE));
! /* Branches require 4 states on the H8/300 and H8/300H.
! On the H8S, they only require 2 states, but all the other instructions
! are twice as fast also, so the relative cost is the same. */
! #define BRANCH_COST 4
/* We say that MOD and DIV are so cheap because otherwise we'll
generate some really horrible code for division of a power of two. */
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