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Compiler Design: Difference between revisions
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==Control Flow | ==Control Flow Analysis== | ||
The first instruction of the program is a leader, as is every target of a branch, and every instruction following a branch (including conditional branches and procedure returns) is a leader. A basic block is the largest sequence of instructions that can only be entered via the first (''leader'') instruction, and only exited by the last instruction (''terminator'', although this is not common terminology). A basic block a ''flows'' to b if and only if: | The first instruction of the program is a leader, as is every target of a branch, and every instruction following a branch (including conditional branches and procedure returns) is a leader. A basic block is the largest sequence of instructions that can only be entered via the first (''leader'') instruction, and only exited by the last instruction (''terminator'', although this is not common terminology). A basic block a ''flows'' to b if and only if: | ||
* either b immediately follows a, and a does not end in an unconditional branch, | * either b immediately follows a, and a does not end in an unconditional branch, | ||
