Document RISC-V d, e, and f extensions - #2274
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These are being stabilized in rust-lang/rust#156188 as cfg-only features. It is a little odd to list them here in the target_feature attribute section since they can't be used with the attribute, but I think it makes sense to keep things together. Perhaps in the future we may consider breaking these lists out into a separate section and rearrange things.
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@romancardenas can you review and confirm everything looks right here? In particular, I was uncertain about the E feature, since it has a slightly different way of being documented in the manual. Also, I noticed that we are linking to the 20250508 tag, which is a bit old now. Would it make sense to change the links to a newer version? I've noticed these features have had some updates. I think the latest ratified version is v20260120. |
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…-cfg-stable-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang#150257 r? @RalfJung
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…-cfg-stable-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang#150257 r? @RalfJung
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…-cfg-stable-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang#150257 r? @RalfJung
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…-cfg-stable-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang#150257 r? @RalfJung
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…-cfg-stable-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang#150257 r? @RalfJung
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Rollup merge of #156188 - romancardenas:riscv-target-feature-cfg-stable-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of #155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to #150257 r? @RalfJung
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…le-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang/rust#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang/rust#150257 r? @RalfJung
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…le-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang/rust#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang/rust#150257 r? @RalfJung
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Update books ## rust-lang/reference 2 commits in 01b0ee707f4571e803c8b2c471d8335a448f5d60..2c27905c15a51983b54d84f050d3bda096194d27 2026-06-15 14:08:07 UTC to 2026-06-08 16:22:03 UTC - undefined: fix typo (rust-lang/reference#2285) - Document RISC-V d, e, and f extensions (rust-lang/reference#2274)
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…le-toggle-unstable, r=RalfJung riscv: promote d, e, and f target_features to CfgStableToggleUnstable Reference PR: - rust-lang/reference#2274 This PR is a continuation of rust-lang/rust#155962 It uses the new `CfgStableToggleUnstable` stability level for the `"d"`, `"e"`, and `"f"` `target_features` of RISC-V. This way, it will be possible to add conditional code blocks depending on whether the target architecture has FPU, for instance. The PR is related to rust-lang/rust#150257 r? @RalfJung
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These are being stabilized in rust-lang/rust#156188 as cfg-only features. It is a little odd to list them here in the target_feature attribute section since they can't be used with the attribute, but I think it makes sense to keep things together. Perhaps in the future we may consider breaking these lists out into a separate section and rearrange things.