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    GCC Middle and Back End API Reference
    
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Data Fields | |
| rtx | source | 
| rtx | target | 
| rtx | zext | 
| rtx | shift | 
| rtx | set | 
RTXes used while computing costs.
| rtx cost_rtxes::set | 
A SET of TARGET.
| rtx cost_rtxes::shift | 
A shift of SOURCE.
| rtx cost_rtxes::source | 
Source and target registers.
| rtx cost_rtxes::target | 
| rtx cost_rtxes::zext | 
A twice_word_mode ZERO_EXTEND of SOURCE.