tech-vector-ext@lists.riscv.org | change "raise illegal instruction" -> "reserved" for static encodings

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change "raise illegal instruction" -> "reserved" for static encodings

Krste Asanovic #484 I'm working through updates to vector spec, and one part of clean up is changing text where it has mandatory raising of illegal instruction exceptions on unsupported encodings to instead state the encoding is "reserved". This will allow future extensions to use these encodings, while current implementations can continue (and are encouraged) to raise illegal instruction exceptions on unsupported reserved encodings. We didn't talk through this in meetings, but I assume this will be uncontroversial. https://github.com/riscv/riscv-v-spec/commit/96a9bc96640b9a12bf8868634671e501f2a24b77 Krste
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Roger Espasa #485 Did you keep/add text encouraging implementations to indeed raise illegal on reserved encodings ? I went through the patch (rather quickly) and did not see it. Roger toggle quoted message Show quoted text On Mon, 26 Oct 2020 at 00:32, Krste Asanovic <krste@...> wrote: I'm working through updates to vector spec, and one part of clean up is changing text where it has mandatory raising of illegal instruction exceptions on unsupported encodings to instead state the encoding is "reserved". This will allow future extensions to use these encodings, while current implementations can continue (and are encouraged) to raise illegal instruction exceptions on unsupported reserved encodings. We didn't talk through this in meetings, but I assume this will be uncontroversial. https://github.com/riscv/riscv-v-spec/commit/96a9bc96640b9a12bf8868634671e501f2a24b77 Krste
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Krste Asanovic #486 There is text in some places stating this, but it is also something that needs to get reemphasized in the base ISA manual intro. Krste toggle quoted message Show quoted text On Oct 25, 2020, at 4:37 PM, Roger Espasa <roger.espasa@...> wrote: Did you keep/add text encouraging implementations to indeed raise illegal on reserved encodings ? I went through the patch (rather quickly) and did not see it. Roger On Mon, 26 Oct 2020 at 00:32, Krste Asanovic <krste@...> wrote: I'm working through updates to vector spec, and one part of clean up is changing text where it has mandatory raising of illegal instruction exceptions on unsupported encodings to instead state the encoding is "reserved". This will allow future extensions to use these encodings, while current implementations can continue (and are encouraged) to raise illegal instruction exceptions on unsupported reserved encodings. We didn't talk through this in meetings, but I assume this will be uncontroversial. https://github.com/riscv/riscv-v-spec/commit/96a9bc96640b9a12bf8868634671e501f2a24b77 Krste
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