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comparison src/share/vm/opto/subnode.cpp @ 17726:085b304a1cc5

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8027754: Enable loop optimizations for loops with MathExact inside Reviewed-by: kvn, iveresov
author rbackman
date Thu, 23 Jan 2014 12:08:28 +0100
parents 55fb97c4c58d
children 4ca6dc0799b6 968a17f18337 78bbf4d43a14
comparison
equal deleted inserted replaced
17725:b4ce4e9eb97d 17726:085b304a1cc5
1124 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)". 1124 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)".
1125 // This moves the constant to the right. Helps value-numbering. 1125 // This moves the constant to the right. Helps value-numbering.
1126 Node *cmp = in(1); 1126 Node *cmp = in(1);
1127 if( !cmp->is_Sub() ) return NULL; 1127 if( !cmp->is_Sub() ) return NULL;
1128 int cop = cmp->Opcode(); 1128 int cop = cmp->Opcode();
1129 if( cop == Op_FastLock || cop == Op_FastUnlock || cop == Op_FlagsProj) return NULL; 1129 if( cop == Op_FastLock || cop == Op_FastUnlock) return NULL;
1130 Node *cmp1 = cmp->in(1); 1130 Node *cmp1 = cmp->in(1);
1131 Node *cmp2 = cmp->in(2); 1131 Node *cmp2 = cmp->in(2);
1132 if( !cmp1 ) return NULL; 1132 if( !cmp1 ) return NULL;
1133
1134 if (_test._test == BoolTest::overflow || _test._test == BoolTest::no_overflow) {
1135 return NULL;
1136 }
1133 1137
1134 // Constant on left? 1138 // Constant on left?
1135 Node *con = cmp1; 1139 Node *con = cmp1;
1136 uint op2 = cmp2->Opcode(); 1140 uint op2 = cmp2->Opcode();
1137 // Move constants to the right of compare's to canonicalize. 1141 // Move constants to the right of compare's to canonicalize.