Zilog Z80380 Manuale Utente Scaricare il pdf (Pagina 28)

Sample Session Introduction

1–16 UM004001-COR1103

• The Level 2 optimization option performs:

– constant propagation

– copy propagation

– dead code elimination

– common sub expression elimination

– jump to jump optimization

– loop invariant code motion

– constant condition evaluation and other condition evaluation optimizations

– constant evaluation and expression simplification

– all the optimizations in level 1

• The Level 3 optimization option performs Level 2 optimizations twice, and replaces

any redirection of read-only nonvolatile global or static data with a copy of the initial

expression.

• The Level 4 optimization option performs Level 2 optimizations three times, and

eliminates common sub-expressions by transforming expression trees.

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Zilog Z80380 Manuale Utente Pagina 28