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src/hotspot/share/opto/mulnode.cpp

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*** 197,221 **** // Get low bit; check for being the only bit Node *res = NULL; unsigned int bit1 = abs_con & (0-abs_con); // Extract low bit if (bit1 == abs_con) { // Found a power of 2? ! res = new LShiftINode(in(1), phase->intcon(log2_intptr(bit1))); } else { // Check for constant with 2 bits set unsigned int bit2 = abs_con-bit1; bit2 = bit2 & (0-bit2); // Extract 2nd bit if (bit2 + bit1 == abs_con) { // Found all bits in con? ! Node *n1 = phase->transform( new LShiftINode(in(1), phase->intcon(log2_intptr(bit1)))); ! Node *n2 = phase->transform( new LShiftINode(in(1), phase->intcon(log2_intptr(bit2)))); res = new AddINode(n2, n1); } else if (is_power_of_2(abs_con+1)) { // Sleezy: power-of-2 -1. Next time be generic. unsigned int temp = abs_con + 1; ! Node *n1 = phase->transform(new LShiftINode(in(1), phase->intcon(log2_intptr(temp)))); res = new SubINode(n1, in(1)); } else { return MulNode::Ideal(phase, can_reshape); } } --- 197,221 ---- // Get low bit; check for being the only bit Node *res = NULL; unsigned int bit1 = abs_con & (0-abs_con); // Extract low bit if (bit1 == abs_con) { // Found a power of 2? ! res = new LShiftINode(in(1), phase->intcon(log2_uint(bit1))); } else { // Check for constant with 2 bits set unsigned int bit2 = abs_con-bit1; bit2 = bit2 & (0-bit2); // Extract 2nd bit if (bit2 + bit1 == abs_con) { // Found all bits in con? ! Node *n1 = phase->transform( new LShiftINode(in(1), phase->intcon(log2_uint(bit1)))); ! Node *n2 = phase->transform( new LShiftINode(in(1), phase->intcon(log2_uint(bit2)))); res = new AddINode(n2, n1); } else if (is_power_of_2(abs_con+1)) { // Sleezy: power-of-2 -1. Next time be generic. unsigned int temp = abs_con + 1; ! Node *n1 = phase->transform(new LShiftINode(in(1), phase->intcon(log2_uint(temp)))); res = new SubINode(n1, in(1)); } else { return MulNode::Ideal(phase, can_reshape); } }
*** 443,453 **** if (t2 && t2->is_con()) { int con = t2->get_con(); // Masking off high bits which are always zero is useless. const TypeInt* t1 = phase->type( in(1) )->isa_int(); if (t1 != NULL && t1->_lo >= 0) { ! jint t1_support = right_n_bits(1 + log2_intptr(t1->_hi)); if ((t1_support & con) == t1_support) return in1; } // Masking off the high bits of a unsigned-shift-right is not // needed either. --- 443,453 ---- if (t2 && t2->is_con()) { int con = t2->get_con(); // Masking off high bits which are always zero is useless. const TypeInt* t1 = phase->type( in(1) )->isa_int(); if (t1 != NULL && t1->_lo >= 0) { ! jint t1_support = right_n_bits(1 + log2_jint(t1->_hi)); if ((t1_support & con) == t1_support) return in1; } // Masking off the high bits of a unsigned-shift-right is not // needed either.
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