| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | opt_expr: improve simplification of comparisons with large constants. | whitequark | 2019-01-02 | 1 | -0/+18 |
| | | | | | | | | | | | | | The idea behind this simplification is that a N-bit signal X being compared with an M-bit constant where M>N and the constant has Nth or higher bit set, it either always succeeds or always fails. However, the existing implementation only worked with one-hot signals for some reason. It also printed incorrect messages. This commit adjusts the simplification to have as much power as possible, and fixes other bugs. | ||||
| * | opt_expr: refactor simplification of unsigned X<onehot and X>=onehot. NFCI. | whitequark | 2019-01-02 | 1 | -0/+5 |
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| * | opt_expr: refactor simplification of signed X>=0 and X<0. NFCI. | whitequark | 2019-01-02 | 1 | -8/+14 |
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| * | opt_expr: simplify any unsigned comparisons with all-0 and all-1. | whitequark | 2019-01-02 | 1 | -0/+11 |
| Before this commit, only unsigned comparisons with all-0 would be simplified. This commit also makes the code handling such comparisons to be more rigorous and not abort on unexpected input. | |||||
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index : iCE40/yosys | |
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