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8205574: Loop predication "assert(f <= 1 && f >= 0) failed Incorrect frequency"

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Reviewed-by: kvn
This commit is contained in:
Roland Westrelin 2018-11-09 10:52:15 +01:00
parent c963d543d2
commit 9429c17b35
1 changed files with 18 additions and 9 deletions
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27
src/hotspot/share/opto/loopPredicate.cpp
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@ -942,6 +942,15 @@ private:
GrowableArray<float> _freqs; // cache frequencies
PhaseIdealLoop* _phase;
void set_rounding(int mode) {
// fesetround is broken on windows
NOT_WINDOWS(fesetround(mode);)
}
void check_frequency(float f) {
NOT_WINDOWS(assert(f <= 1 && f >= 0, "Incorrect frequency");)
}
public:
PathFrequency(Node* dom, PhaseIdealLoop* phase)
: _dom(dom), _stack(0), _phase(phase) {
@ -949,7 +958,7 @@ public:
float to(Node* n) {
// post order walk on the CFG graph from n to _dom
fesetround(FE_TOWARDZERO); // make sure rounding doesn't push frequency above 1
set_rounding(FE_TOWARDZERO); // make sure rounding doesn't push frequency above 1
IdealLoopTree* loop = _phase->get_loop(_dom);
Node* c = n;
for (;;) {
@ -976,14 +985,14 @@ public:
inner_head = inner_loop->_head->as_Loop();
inner_head->verify_strip_mined(1);
}
fesetround(FE_UPWARD); // make sure rounding doesn't push frequency above 1
set_rounding(FE_UPWARD); // make sure rounding doesn't push frequency above 1
float loop_exit_cnt = 0.0f;
for (uint i = 0; i < inner_loop->_body.size(); i++) {
Node *n = inner_loop->_body[i];
float c = inner_loop->compute_profile_trip_cnt_helper(n);
loop_exit_cnt += c;
}
fesetround(FE_TOWARDZERO);
set_rounding(FE_TOWARDZERO);
float cnt = -1;
if (n->in(0)->is_If()) {
IfNode* iff = n->in(0)->as_If();
@ -1003,9 +1012,9 @@ public:
cnt = p * jmp->_fcnt;
}
float this_exit_f = cnt > 0 ? cnt / loop_exit_cnt : 0;
assert(this_exit_f <= 1 && this_exit_f >= 0, "Incorrect frequency");
check_frequency(this_exit_f);
f = f * this_exit_f;
assert(f <= 1 && f >= 0, "Incorrect frequency");
check_frequency(f);
} else {
float p = -1;
if (n->in(0)->is_If()) {
@ -1018,7 +1027,7 @@ public:
p = n->in(0)->as_Jump()->_probs[n->as_JumpProj()->_con];
}
f = f * p;
assert(f <= 1 && f >= 0, "Incorrect frequency");
check_frequency(f);
}
_freqs.at_put_grow(n->_idx, (float)f, -1);
_stack.pop();
@ -1026,7 +1035,7 @@ public:
float prev_f = _freqs_stack.pop();
float new_f = f;
f = new_f + prev_f;
assert(f <= 1 && f >= 0, "Incorrect frequency");
check_frequency(f);
uint i = _stack.index();
if (i < n->req()) {
c = n->in(i);
@ -1039,8 +1048,8 @@ public:
}
}
if (_stack.size() == 0) {
fesetround(FE_TONEAREST);
assert(f >= 0 && f <= 1, "should have been computed");
set_rounding(FE_TONEAREST);
check_frequency(f);
return f;
}
} else if (c->is_Loop()) {