< Optimizing Linkage Editor (rlink) Options / Optimize Options >
[Format]
-optimize [= <suboption>[,...] ]
<suboption>: { SYmbol_delete | SAMe_code | SHort_format | Branch | SPeed | SAFe }
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When this option is omitted, the default is optimize.
[Description]
- | When optimize is specified, optimization is performed for the file specified with the goptimize option at compilation or assembly. |
- | -optimize (no suboptions) executes all optimization. It has the same meaning as
-optimize=symbol_delete,same_code,short_format,branch. |
- | -optimize=speed executes optimizations other than those reducing object speed. It has the same meaning as
-optimize=symbol_delete,short_format,branch |
- | -optimize=safe executes optimization other than those limited by variable or function attributes. It has the same meaning as -optimize=short_format,branch |
- | Other suboptions mean optimization as the following table. |
Table 2.18 | Suboptions of optimize Option |
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symbol_delete
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Deletes variables/functions that are not referenced.
Always be sure to specify #pragma entry at compilation or the entry option in the optimizing linkage editor.
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O
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X
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same_code
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Creates a subroutine for the same instruction sequence.
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O
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X
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short_format
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Replaces an instruction having a displacement or an immediate value with a smaller-size instruction when the code size of the displacement or immediate value can be reduced.
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O
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O
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branch
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Optimizes branch instruction size according to program allocation information. Even if this option is not specified, it is performed when any other optimization is executed.
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O
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O
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Notes 1. | RXC: C/C++ program for RX Family,
RXA: Assembly program for RX Family |
[Remarks]
- | When form={object | relocate | library} or strip is specified, this option is unavailable. |
- | optimize=symbol_delete is invalid unless the execution start address is specified by using either #pragma entry or the entry option. |