Renesas TM V.3.20A Spezifikationen PDF herunterladen (Seite 53)

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Renesas Technology, Tools FAQs

Last Updated: August 7, 2000

Document Number: 01051009_e

When optimization option "-ONSBD" is specified, what kind of de-optimization happens?

The following de-optimizations are performed:

- Common statement expressions are merged (so that the same statement expressions will not be calculated repeatedly)

●

- Common instruction blocks are bound together (repetitive instructions are replaced by branches)●

- Multiple byte-store operations to sequential addresses are converted to word-store operations●

- Sequential constant byte-push operations are converted to word-push operations●

- Continuous shift operations are bound together (bind "b=a<<2; b<<=2;" to "b=a<<4", etc.)●

- Bit operations are grouped into OR, AND operations●

- 'for' statement loop condition check is moved to the end of the loop to reduce redundant loop compare operations●

- Unconditional branch to "return" statement is replaced with "return" statement (NC308 only)●

- Multiply/division by multiples of 2 is replaced to shift operation●

- Auto variables is assigned to register●

- Constants are folded in●

* Note that these optimizations may not be performed depending on pre and post statements.

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