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| -rw-r--r-- | src/doc/unstable-book/src/language-features/asm-experimental-reg.md | 40 |
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diff --git a/src/doc/unstable-book/src/language-features/asm-experimental-reg.md b/src/doc/unstable-book/src/language-features/asm-experimental-reg.md new file mode 100644 index 00000000000..a251573d276 --- /dev/null +++ b/src/doc/unstable-book/src/language-features/asm-experimental-reg.md @@ -0,0 +1,40 @@ +# `asm_experimental_arch` + +The tracking issue for this feature is: [#133416] + +[#133416]: https://github.com/rust-lang/rust/issues/133416 + +------------------------ + +This tracks support for additional registers in architectures where inline assembly is already stable. + +## Register classes + +| Architecture | Register class | Registers | LLVM constraint code | +| ------------ | -------------- | --------- | -------------------- | +| s390x | `vreg` | `v[0-31]` | `v` | + +> **Notes**: +> - s390x `vreg` is clobber-only in stable. + +## Register class supported types + +| Architecture | Register class | Target feature | Allowed types | +| ------------ | -------------- | -------------- | ------------- | +| s390x | `vreg` | `vector` | `i32`, `f32`, `i64`, `f64`, `i128`, `f128`, `i8x16`, `i16x8`, `i32x4`, `i64x2`, `f32x4`, `f64x2` | + +## Register aliases + +| Architecture | Base register | Aliases | +| ------------ | ------------- | ------- | + +## Unsupported registers + +| Architecture | Unsupported register | Reason | +| ------------ | -------------------- | ------ | + +## Template modifiers + +| Architecture | Register class | Modifier | Example output | LLVM modifier | +| ------------ | -------------- | -------- | -------------- | ------------- | +| s390x | `vreg` | None | `%v0` | None | |