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