/* Statistics we collect about inlining algorithm. */
static int overall_size;
static gcov_type max_count;
-static sreal max_count_real, max_relbenefit_real, half_int_min_real;
static gcov_type spec_rem;
+/* Pre-computed constants 1/CGRAPH_FREQ_BASE and 1/100. */
+static sreal cgraph_freq_base_rec, percent_rec;
+
/* Return false when inlining edge E would lead to violating
limits on function unit growth or stack usage growth.
/* Compute time of the edge->caller + edge->callee execution when inlining
does not happen. */
-inline gcov_type
+inline sreal
compute_uninlined_call_time (struct inline_summary *callee_info,
struct cgraph_edge *edge)
{
- gcov_type uninlined_call_time =
- RDIV ((gcov_type)callee_info->time * MAX (edge->frequency, 1),
- CGRAPH_FREQ_BASE);
- gcov_type caller_time = inline_summaries->get (edge->caller->global.inlined_to
- ? edge->caller->global.inlined_to
- : edge->caller)->time;
+ sreal uninlined_call_time = (sreal)callee_info->time
+ * MAX (edge->frequency, 1)
+ * cgraph_freq_base_rec;
+ int caller_time = inline_summaries->get (edge->caller->global.inlined_to
+ ? edge->caller->global.inlined_to
+ : edge->caller)->time;
return uninlined_call_time + caller_time;
}
/* Same as compute_uinlined_call_time but compute time when inlining
does happen. */
-inline gcov_type
+inline sreal
compute_inlined_call_time (struct cgraph_edge *edge,
int edge_time)
{
- gcov_type caller_time = inline_summaries->get (edge->caller->global.inlined_to
- ? edge->caller->global.inlined_to
- : edge->caller)->time;
- gcov_type time = (caller_time
- + RDIV (((gcov_type) edge_time
- - inline_edge_summary (edge)->call_stmt_time)
- * MAX (edge->frequency, 1), CGRAPH_FREQ_BASE));
- /* Possible one roundoff error, but watch for overflows. */
- gcc_checking_assert (time >= INT_MIN / 2);
- if (time < 0)
- time = 0;
+ int caller_time = inline_summaries->get (edge->caller->global.inlined_to
+ ? edge->caller->global.inlined_to
+ : edge->caller)->time;
+ sreal time = (sreal)caller_time
+ + ((sreal) (edge_time - inline_edge_summary (edge)->call_stmt_time)
+ * MAX (edge->frequency, 1)
+ * cgraph_freq_base_rec);
+ gcc_checking_assert (time >= 0);
return time;
}
static bool
big_speedup_p (struct cgraph_edge *e)
{
- gcov_type time = compute_uninlined_call_time (inline_summaries->get (e->callee),
- e);
- gcov_type inlined_time = compute_inlined_call_time (e,
- estimate_edge_time (e));
+ sreal time = compute_uninlined_call_time (inline_summaries->get (e->callee), e);
+ sreal inlined_time = compute_inlined_call_time (e, estimate_edge_time (e));
if (time - inlined_time
- > RDIV (time * PARAM_VALUE (PARAM_INLINE_MIN_SPEEDUP), 100))
+ > (sreal) time * PARAM_VALUE (PARAM_INLINE_MIN_SPEEDUP)
+ * percent_rec)
return true;
return false;
}
#define RELATIVE_TIME_BENEFIT_RANGE (INT_MAX / 64)
/* Return relative time improvement for inlining EDGE in range
- 1...RELATIVE_TIME_BENEFIT_RANGE */
+ as value NUMERATOR/DENOMINATOR. */
-static inline int
+static inline void
relative_time_benefit (struct inline_summary *callee_info,
struct cgraph_edge *edge,
- int edge_time)
+ int edge_time,
+ sreal *numerator,
+ sreal *denominator)
{
- gcov_type relbenefit;
- gcov_type uninlined_call_time = compute_uninlined_call_time (callee_info, edge);
- gcov_type inlined_call_time = compute_inlined_call_time (edge, edge_time);
-
/* Inlining into extern inline function is not a win. */
if (DECL_EXTERNAL (edge->caller->global.inlined_to
? edge->caller->global.inlined_to->decl
: edge->caller->decl))
- return 1;
+ {
+ *numerator = (sreal) 1;
+ *denominator = (sreal) 1024;
+ return;
+ }
- /* Watch overflows. */
- gcc_checking_assert (uninlined_call_time >= 0);
- gcc_checking_assert (inlined_call_time >= 0);
- gcc_checking_assert (uninlined_call_time >= inlined_call_time);
+ sreal uninlined_call_time = compute_uninlined_call_time (callee_info, edge);
+ sreal inlined_call_time = compute_inlined_call_time (edge, edge_time);
/* Compute relative time benefit, i.e. how much the call becomes faster.
??? perhaps computing how much the caller+calle together become faster
would lead to more realistic results. */
- if (!uninlined_call_time)
+ if (uninlined_call_time == (sreal) 0)
uninlined_call_time = 1;
- relbenefit =
- RDIV (((gcov_type)uninlined_call_time - inlined_call_time) * RELATIVE_TIME_BENEFIT_RANGE,
- uninlined_call_time);
- relbenefit = MIN (relbenefit, RELATIVE_TIME_BENEFIT_RANGE);
- gcc_checking_assert (relbenefit >= 0);
- relbenefit = MAX (relbenefit, 1);
- return relbenefit;
-}
+ /* Avoid zeros, these are not useful later in calculations. */
+ if (uninlined_call_time == inlined_call_time)
+ *numerator = ((sreal) 1)>>8;
+ else
+ *numerator = uninlined_call_time - inlined_call_time;
+ *denominator = uninlined_call_time;
+#ifdef ENABLE_CHECKING
+ gcc_checking_assert (*numerator >= 0);
+ gcc_checking_assert (*denominator >= 0);
+#endif
+}
/* A cost model driving the inlining heuristics in a way so the edges with
smallest badness are inlined first. After each inlining is performed
inline_hints hints;
if (DECL_DISREGARD_INLINE_LIMITS (callee->decl))
- return INT_MIN;
+ return sreal::min ();
growth = estimate_edge_growth (edge);
edge_time = estimate_edge_time (edge);
/* Always prefer inlining saving code size. */
if (growth <= 0)
{
- badness = INT_MIN / 2 + growth;
+ badness = (sreal) (-SREAL_MIN_SIG + growth) << (SREAL_MAX_EXP / 256);
if (dump)
- fprintf (dump_file, " %"PRId64": Growth %d <= 0\n", badness.to_int (),
+ fprintf (dump_file, " %f: Growth %d <= 0\n", badness.to_double (),
growth);
}
/* When profiling is available, compute badness as:
- relative_edge_count * relative_time_benefit
+ edge_count * relative_time_benefit
goodness = -------------------------------------------
- growth_f_caller
- badness = -goodness
+ growth_of_caller
+ badness = - goodness
The fraction is upside down, because on edge counts and time beneits
the bounds are known. Edge growth is essentially unlimited. */
else if (max_count)
{
- int relbenefit = relative_time_benefit (callee_info, edge, edge_time);
- /* Capping edge->count to max_count. edge->count can be larger than
- max_count if an inline adds new edges which increase max_count
- after max_count is computed. */
- gcov_type edge_count = edge->count > max_count ? max_count : edge->count;
-
- sreal relbenefit_real (relbenefit, 0);
- sreal growth_real (growth, 0);
+ sreal numerator, denominator;
+ relative_time_benefit (callee_info, edge, edge_time, &numerator,
+ &denominator);
- /* relative_edge_count. */
- sreal tmp (edge_count, 0);
- tmp /= max_count_real;
+ if (edge->count)
+ numerator *= edge->count;
+ denominator *= growth;
- /* relative_time_benefit. */
- tmp *= relbenefit_real;
- tmp /= max_relbenefit_real;
-
- /* growth_f_caller. */
- tmp *= half_int_min_real;
- tmp /= growth_real;
-
- badness = -1 * tmp.to_int ();
+ badness = - numerator / denominator;
if (dump)
{
+ sreal num,den;
+ relative_time_benefit (callee_info, edge, edge_time, &num, &den);
fprintf (dump_file,
- " %"PRId64" (relative %f): profile info. Relative count %f%s"
- " * Relative benefit %f\n",
- badness.to_int (), (double) badness.to_int () / INT_MIN,
- (double) edge_count / max_count,
- edge->count > max_count ? " (capped to max_count)" : "",
- relbenefit * 100.0 / RELATIVE_TIME_BENEFIT_RANGE);
+ " %f: profile info. count %"PRId64
+ " * Relative benefit %f / growth %i\n",
+ badness.to_double (), (int64_t)edge->count,
+ (num / den * 100).to_double (), growth);
}
}
and some not. */
else if (flag_guess_branch_prob)
{
- badness = (relative_time_benefit (callee_info, edge, edge_time)
- * (INT_MIN / 16 / RELATIVE_TIME_BENEFIT_RANGE));
- badness /= (MIN (65536/2, growth) * MIN (65536/2, MAX (1, callee_info->growth)));
- gcc_checking_assert (badness <=0 && badness >= INT_MIN / 16);
- if ((hints & (INLINE_HINT_indirect_call
- | INLINE_HINT_loop_iterations
- | INLINE_HINT_array_index
- | INLINE_HINT_loop_stride))
- || callee_info->growth <= 0)
- badness *= 8;
- if (hints & (INLINE_HINT_same_scc))
- badness /= 16;
- else if (hints & (INLINE_HINT_in_scc))
- badness /= 8;
- else if (hints & (INLINE_HINT_cross_module))
- badness /= 2;
- gcc_checking_assert (badness <= 0 && badness >= INT_MIN / 2);
- if ((hints & INLINE_HINT_declared_inline) && badness >= INT_MIN / 32)
- badness *= 16;
+ sreal numerator, denominator;
+ relative_time_benefit (callee_info, edge, edge_time, &numerator,
+ &denominator);
+ denominator *= growth;
+ if (callee_info->growth > 0)
+ denominator *= callee_info->growth;
+
+ badness = - numerator / denominator;
+
if (dump)
{
+ sreal num,den;
+ relative_time_benefit (callee_info, edge, edge_time, &num, &den);
fprintf (dump_file,
- " %"PRId64": guessed profile. frequency %f,"
- " benefit %f%%, time w/o inlining %i, time w inlining %i"
+ " %f: guessed profile. frequency %f,"
+ " benefit %f%%, time w/o inlining %f, time w inlining %f"
" overall growth %i (current) %i (original)\n",
- badness.to_int (), (double)edge->frequency / CGRAPH_FREQ_BASE,
- relative_time_benefit (callee_info, edge, edge_time) * 100.0
- / RELATIVE_TIME_BENEFIT_RANGE,
- (int)compute_uninlined_call_time (callee_info, edge),
- (int)compute_inlined_call_time (edge, edge_time),
+ badness.to_double (), (double)edge->frequency / CGRAPH_FREQ_BASE,
+ (num/den).to_double () * 100,
+ compute_uninlined_call_time (callee_info, edge).to_double (),
+ compute_inlined_call_time (edge, edge_time).to_double (),
estimate_growth (callee),
callee_info->growth);
}
else
{
int nest = MIN (inline_edge_summary (edge)->loop_depth, 8);
- badness = growth * 256;
+ badness = growth;
/* Decrease badness if call is nested. */
if (badness > 0)
badness = badness >> nest;
else
- {
- badness = badness << nest;
- }
+ badness = badness << nest;
if (dump)
- fprintf (dump_file, " %"PRId64": no profile. nest %i\n", badness.to_int (),
+ fprintf (dump_file, " %f: no profile. nest %i\n", badness.to_double (),
nest);
}
+ gcc_checking_assert (badness != 0);
- /* Ensure that we did not overflow in all the fixed point math above. */
- gcc_assert (badness >= INT_MIN);
- gcc_assert (badness <= INT_MAX - 1);
- /* Make recursive inlining happen always after other inlining is done. */
if (edge->recursive_p ())
- return badness + 1;
- else
- return badness;
+ badness = badness.shift (badness > 0 ? 4 : -4);
+ if ((hints & (INLINE_HINT_indirect_call
+ | INLINE_HINT_loop_iterations
+ | INLINE_HINT_array_index
+ | INLINE_HINT_loop_stride))
+ || callee_info->growth <= 0)
+ badness = badness.shift (badness > 0 ? -2 : 2);
+ if (hints & (INLINE_HINT_same_scc))
+ badness = badness.shift (badness > 0 ? 3 : -3);
+ else if (hints & (INLINE_HINT_in_scc))
+ badness = badness.shift (badness > 0 ? 2 : -2);
+ else if (hints & (INLINE_HINT_cross_module))
+ badness = badness.shift (badness > 0 ? 1 : -1);
+ if ((hints & INLINE_HINT_declared_inline))
+ badness = badness.shift (badness > 0 ? -3 : 3);
+ if (dump)
+ fprintf (dump_file, " Adjusted by hints %f\n", badness.to_double ());
+ return badness;
}
/* Recompute badness of EDGE and update its key in HEAP if needed. */
edge_heap_node_t *n = (edge_heap_node_t *) edge->aux;
gcc_checking_assert (n->get_data () == edge);
- /* fibonacci_heap::replace_key only decrease the keys.
- When we increase the key we do not update heap
- and instead re-insert the element once it becomes
- a minimum of heap. */
+ /* fibonacci_heap::replace_key does busy updating of the
+ heap that is unnecesarily expensive.
+ We do lazy increases: after extracting minimum if the key
+ turns out to be out of date, it is re-inserted into heap
+ with correct value. */
if (badness < n->get_key ())
{
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file,
- " decreasing badness %s/%i -> %s/%i, %"PRId64
- " to %"PRId64"\n",
+ " decreasing badness %s/%i -> %s/%i, %f"
+ " to %f\n",
xstrdup_for_dump (edge->caller->name ()),
edge->caller->order,
xstrdup_for_dump (edge->callee->name ()),
edge->callee->order,
- n->get_key ().to_int (),
- badness.to_int ());
+ n->get_key ().to_double (),
+ badness.to_double ());
}
heap->decrease_key (n, badness);
- gcc_checking_assert (n->get_key () == badness);
}
}
else
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file,
- " enqueuing call %s/%i -> %s/%i, badness %"PRId64"\n",
+ " enqueuing call %s/%i -> %s/%i, badness %f\n",
xstrdup_for_dump (edge->caller->name ()),
edge->caller->order,
xstrdup_for_dump (edge->callee->name ()),
edge->callee->order,
- badness.to_int ());
+ badness.to_double ());
}
edge->aux = heap->insert (badness, edge);
}
if (max_count < edge->count)
max_count = edge->count;
}
- max_count_real = sreal (max_count, 0);
- max_relbenefit_real = sreal (RELATIVE_TIME_BENEFIT_RANGE, 0);
- half_int_min_real = sreal (INT_MAX / 2, 0);
ipa_free_postorder_info ();
initialize_growth_caches ();
struct cgraph_node *where, *callee;
sreal badness = edge_heap.min_key ();
sreal current_badness;
- sreal cached_badness;
int growth;
edge = edge_heap.extract_min ();
if (!edge->inline_failed || !edge->callee->analyzed)
continue;
- /* Be sure that caches are maintained consistent.
- We can not make this ENABLE_CHECKING only because it cause different
- updates of the fibheap queue. */
- cached_badness = edge_badness (edge, false);
+#ifdef ENABLE_CHECKING
+ /* Be sure that caches are maintained consistent. */
+ sreal cached_badness = edge_badness (edge, false);
reset_edge_growth_cache (edge);
reset_node_growth_cache (edge->callee);
current_badness = edge_badness (edge, false);
gcc_assert (cached_badness == current_badness);
gcc_assert (current_badness >= badness);
+#else
+ current_badness = edge_badness (edge, false);
+#endif
if (current_badness != badness)
{
- edge->aux = edge_heap.insert (current_badness, edge);
- continue;
+ if (edge_heap.min () && badness > edge_heap.min_key ())
+ {
+ edge->aux = edge_heap.insert (current_badness, edge);
+ continue;
+ }
+ else
+ badness = current_badness;
}
if (!can_inline_edge_p (edge, true))
inline_summaries->get (callee)->size);
fprintf (dump_file,
" to be inlined into %s/%i in %s:%i\n"
- " Estimated badness is %"PRId64", frequency %.2f.\n",
+ " Estimated badness is %f, frequency %.2f.\n",
edge->caller->name (), edge->caller->order,
edge->call_stmt ? "unknown"
: gimple_filename ((const_gimple) edge->call_stmt),
edge->call_stmt ? -1
: gimple_lineno ((const_gimple) edge->call_stmt),
- badness.to_int (),
+ badness.to_double (),
edge->frequency / (double)CGRAPH_FREQ_BASE);
if (edge->count)
fprintf (dump_file," Called %"PRId64"x\n",
if (!optimize)
return 0;
+ cgraph_freq_base_rec = (sreal) 1 / (sreal) CGRAPH_FREQ_BASE;
+ percent_rec = (sreal) 1 / (sreal) 100;
+
order = XCNEWVEC (struct cgraph_node *, symtab->cgraph_count);
if (in_lto_p && optimize)
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