This introduces a hook to implement insn_cost. If a target does not implement the hook, the old function (i.e. pattern_cost) is used.
--- gcc/doc/tm.texi | 12 ++++++++++++ gcc/doc/tm.texi.in | 2 ++ gcc/rtlanal.c | 3 +++ gcc/target.def | 14 ++++++++++++++ 4 files changed, 31 insertions(+) diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 23e85c7..dfba37f 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -6640,6 +6640,18 @@ should probably only be given to addresses with different numbers of registers on machines with lots of registers. @end deftypefn +@deftypefn {Target Hook} int TARGET_INSN_COST (rtx_insn *@var{insn}, bool @var{speed}) +This target hook describes the relative costs of RTL instructions. + +In implementing this hook, you can use the construct +@code{COSTS_N_INSNS (@var{n})} to specify a cost equal to @var{n} fast +instructions. + +When optimizing for code size, i.e.@: when @code{speed} is +false, this target hook should be used to estimate the relative +size cost of an expression, again relative to @code{COSTS_N_INSNS}. +@end deftypefn + @deftypefn {Target Hook} {unsigned int} TARGET_MAX_NOCE_IFCVT_SEQ_COST (edge @var{e}) This hook returns a value in the same units as @code{TARGET_RTX_COSTS}, giving the maximum acceptable cost for a sequence generated by the RTL diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in index 6df08a2..6e81341 100644 --- a/gcc/doc/tm.texi.in +++ b/gcc/doc/tm.texi.in @@ -4796,6 +4796,8 @@ Define this macro if a non-short-circuit operation produced by @hook TARGET_ADDRESS_COST +@hook TARGET_INSN_COST + @hook TARGET_MAX_NOCE_IFCVT_SEQ_COST @hook TARGET_NOCE_CONVERSION_PROFITABLE_P diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 8f05546..aca194e 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -5314,6 +5314,9 @@ pattern_cost (rtx pat, bool speed) int insn_cost (rtx_insn *insn, bool speed) { + if (targetm.insn_cost) + return targetm.insn_cost (insn, speed); + return pattern_cost (PATTERN (insn), speed); } diff --git a/gcc/target.def b/gcc/target.def index 6d67b1f..2eb411d 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -3647,6 +3647,20 @@ registers on machines with lots of registers.", int, (rtx address, machine_mode mode, addr_space_t as, bool speed), default_address_cost) +/* Compute a cost for INSN. */ +DEFHOOK +(insn_cost, + "This target hook describes the relative costs of RTL instructions.\n\ +\n\ +In implementing this hook, you can use the construct\n\ +@code{COSTS_N_INSNS (@var{n})} to specify a cost equal to @var{n} fast\n\ +instructions.\n\ +\n\ +When optimizing for code size, i.e.@: when @code{speed} is\n\ +false, this target hook should be used to estimate the relative\n\ +size cost of an expression, again relative to @code{COSTS_N_INSNS}.", + int, (rtx_insn *insn, bool speed), NULL) + /* Give a cost, in RTX Costs units, for an edge. Like BRANCH_COST, but with well defined units. */ DEFHOOK -- 1.9.3