C2 does not match an instruction with swaped operands of commutative operation.
For example, the next instruction will not be matched if a LoadI node
is the first operand:

instruct addI_rReg_mem(rRegI dst, memory src, rFlagsReg cr)
%{
  match(Set dst (AddI dst (LoadI src)));

So instead of generating one instruction "add reg, mem" C2 will generate 2:
"mov reg1, mem"
"add reg, reg1"
Posted Date : 2006-08-17 01:31:47.0

N/A

See Description.
Posted Date : 2006-08-17 01:43:41.0