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| ghostmansd | lkcl, I have a question regarding failfirst mode for cr ops. | 17:07 |
|---|---|---|
| ghostmansd | failfirst is also available for normal and ld/st imm modes. | 17:07 |
| ghostmansd | For these, we set prefix.rm.mode[0, 1] to 0b01. | 17:08 |
| ghostmansd | However, CR ops don't seem to follow the same pattern. | 17:08 |
| ghostmansd | Here's what we have for (value, mask, field) entries: | 17:09 |
| ghostmansd | # normal | 17:09 |
| ghostmansd | (0b010001, 0b110001, "ffrc1"), # ffirst, Rc=1 | 17:09 |
| ghostmansd | (0b010000, 0b110001, "ffrc0"), # ffirst, Rc=0 | 17:09 |
| ghostmansd | # ld/st imm | 17:09 |
| ghostmansd | (0b010001, 0b110001, "ffrc1"), # ffirst, Rc=1 | 17:09 |
| ghostmansd | (0b010000, 0b110001, "ffrc0"), # ffirst, Rc=0 | 17:09 |
| ghostmansd | # crops | 17:09 |
| ghostmansd | (0b100001, 0b100001, "ff3"), # ffist, 3-bit CR | 17:09 |
| ghostmansd | (0b100000, 0b100000, "ff5"), # ffist, 5-bit CR | 17:09 |
| ghostmansd | For normal and ld/st imm, value and mask patterns are created as `search = ((int(rm.mode) << 1) | Rc)`. | 17:10 |
| ghostmansd | I'd rather expect 0b010001 and 0b010000 for ff3 and ff5 respectively. | 17:23 |
| ghostmansd | Is this logic intentional? | 17:24 |
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| ghostmansd | lkcl, never mind, found the comment "# sigh, CROPs is different" | 19:08 |
| lkcl | ghostmansd, yes :) you can't have a CR Field "co-result" (Rc=1) with an operation that creates... a CR Field | 21:01 |
| lkcl | Rc=1 says "is the 64-bit result greater, less, or equal to zero?" | 21:02 |
| lkcl | and CR ops produce a 4-bit result, not a 64-bit result. | 21:02 |
| lkcl | doh :) | 21:02 |
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