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8022993: Convert MAX_UNROLL constant to LoopMaxUnroll C2 flag

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Replace MAX_UNROLL constant with new C2 LoopMaxUnroll flag.

Reviewed-by: roland
This commit is contained in:
Vladimir Kozlov 2013-08-14 10:21:26 -07:00
parent ed4b026105
commit 20f7d1a82a
2 changed files with 4 additions and 3 deletions
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3
hotspot/src/share/vm/opto/c2_globals.hpp
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@ -179,6 +179,9 @@
product_pd(intx, LoopUnrollLimit, \
"Unroll loop bodies with node count less than this") \
\
product(intx, LoopMaxUnroll, 16, \
"Maximum number of unrolls for main loop") \
\
product(intx, LoopUnrollMin, 4, \
"Minimum number of unroll loop bodies before checking progress" \
"of rounds of unroll,optimize,..") \

4
hotspot/src/share/vm/opto/loopTransform.cpp
View File

@ -624,8 +624,6 @@ bool IdealLoopTree::policy_maximally_unroll( PhaseIdealLoop *phase ) const {
}
#define MAX_UNROLL 16 // maximum number of unrolls for main loop
//------------------------------policy_unroll----------------------------------
// Return TRUE or FALSE if the loop should be unrolled or not. Unroll if
// the loop is a CountedLoop and the body is small enough.
@ -642,7 +640,7 @@ bool IdealLoopTree::policy_unroll( PhaseIdealLoop *phase ) const {
if (cl->trip_count() <= (uint)(cl->is_normal_loop() ? 2 : 1)) return false;
int future_unroll_ct = cl->unrolled_count() * 2;
if (future_unroll_ct > MAX_UNROLL) return false;
if (future_unroll_ct > LoopMaxUnroll) return false;
// Check for initial stride being a small enough constant
if (abs(cl->stride_con()) > (1<<2)*future_unroll_ct) return false;