| openpowerbot | [slack] <Benjamin Herrenschmidt> FYI, latest `ghdl` fails at generating `microwatt.v` with an internal error: https://github.com/ghdl/ghdl/issues/2205 (last good commit for me was `0d6b21c3b` but I haven't bisected so the breakage could be newer) | 07:53 |
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| openpowerbot | [slack] <Nicholas Piggin> How is microwatt at unaligned ld and std? We have this question for the kernel https://github.com/linuxppc/issues/issues/76 but hasn't made any progress because this flag is only relevant to non-VMX paths. The patch that initially introduced this was linux.git 4ec577a28980a which says unaligned ld/std "without _any_ performance hit". Modern POWER CPUs at least require cache line crossings to issue tw | 09:17 |
| openpowerbot | [slack] <joel> @Paul Mackerras would be able to answer that for us | 09:37 |
| openpowerbot | [slack] <Paul Mackerras> Unaligned ld and std take one cycle longer than aligned | 12:31 |
| openpowerbot | [slack] <Paul Mackerras> (for ld that assumes that both pieces hit in the dcache) | 12:32 |
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