| 摘要 |
Improved parallelism in the generated schedules of basic blocks of a program being compiled is advantageously achieved by providing an improved scheduler to the code generator of a compiler targeting a multi-issue architecture computer. The improved scheduler implements the prior-art list scheduling technique with a number of improvements including differentiation of instructions into squeezed and non-squeezed instructions, employing priority functions that factor in the squeezed and non-squeezed instruction distinction for selecting a candidate instruction, tracking only the resources utilized by the non-squeezed instructions, and tracking the scheduling of the squeezed and non-squeezed instructions separately. When software pipelining is additionally employed to further increase parallelism in program loops, the improved scheduler factors only the non-squeezed instructions in the initial minimum schedule (initiation internal) size calculation.
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