From 94105f5c8a20973e49579064e7ae3ac2013117e8 Mon Sep 17 00:00:00 2001 From: Segher Boessenkool Date: Mon, 9 Oct 2017 21:47:08 +0200 Subject: [PATCH] Add targetm.insn_cost hook This adds a new hook that the insn_cost function uses if a target has implemented it (it uses the old pattern_cost nee insn_rtx_cost if not). * target.def (insn_cost): New hook. * doc/tm.texi.in (TARGET_INSN_COST): New hook. * doc/tm.texi: Regenerate. * rtlanal.c (insn_cost): Use the new hook. From-SVN: r253562 --- gcc/ChangeLog | 7 +++++++ gcc/doc/tm.texi | 12 ++++++++++++ gcc/doc/tm.texi.in | 2 ++ gcc/rtlanal.c | 3 +++ gcc/target.def | 14 ++++++++++++++ 5 files changed, 38 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index dfb19231a98..871166a0bd3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2017-10-09 Segher Boessenkool + + * target.def (insn_cost): New hook. + * doc/tm.texi.in (TARGET_INSN_COST): New hook. + * doc/tm.texi: Regenerate. + * rtlanal.c (insn_cost): Use the new hook. + 2017-10-09 Segher Boessenkool * combine.c (combine_validate_cost): Compute the new insn_cost, diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 8f503e1904e..03772177d0d 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -6652,6 +6652,18 @@ 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 15b3f1f6771..d2cf68fee00 100644 --- a/gcc/doc/tm.texi.in +++ b/gcc/doc/tm.texi.in @@ -4600,6 +4600,8 @@ 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 f01eab5bdb4..eadf691d077 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -5329,6 +5329,9 @@ 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 80ef7469a50..aac5d2711a8 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -3715,6 +3715,20 @@ 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 -- 2.30.2