Doesn't build on `no_std` with no features or alloc enabled only

[MuntasirSZN]

I tested no_std with x86_64-unknown-linux-gnu and x86_64-unknown-uefi.

error[E0425]: cannot find function `mm_extract_epi64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:138:22
    |
138 |         let x0_low = mm_extract_epi64(x0, 0);
    |                      ^^^^^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse41.rs:16:1
    |
 16 | pub fn _mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
    | ------------------------------------------------------------ similarly named function `_mm_extract_epi64` defined here
    |
help: the leading underscore in `_mm_extract_epi64` marks it as unused, consider renaming it to `mm_extract_epi64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse41.rs:16:8
    |
 16 - pub fn _mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
 16 + pub fn mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_extract_epi64;
    |

error[E0425]: cannot find function `mm_extract_epi64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:139:23
    |
139 |         let x0_high = mm_extract_epi64(x0, 1);
    |                       ^^^^^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse41.rs:16:1
    |
 16 | pub fn _mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
    | ------------------------------------------------------------ similarly named function `_mm_extract_epi64` defined here
    |
help: the leading underscore in `_mm_extract_epi64` marks it as unused, consider renaming it to `mm_extract_epi64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse41.rs:16:8
    |
 16 - pub fn _mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
 16 + pub fn mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_extract_epi64;
    |

error[E0425]: cannot find function `mm_extract_epi64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:140:27
    |
140 |         let x0_combined = mm_extract_epi64(
    |                           ^^^^^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse41.rs:16:1
    |
 16 | pub fn _mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
    | ------------------------------------------------------------ similarly named function `_mm_extract_epi64` defined here
    |
help: the leading underscore in `_mm_extract_epi64` marks it as unused, consider renaming it to `mm_extract_epi64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse41.rs:16:8
    |
 16 - pub fn _mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
 16 + pub fn mm_extract_epi64<const IMM1: i32>(a: __m128i) -> i64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_extract_epi64;
    |

error[E0425]: cannot find function `crc_shift_iscsi_sse` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:141:13
    |
141 |             crc_shift_iscsi_sse(mm_crc32_u64(mm_crc32_u64(0, x0_low), x0_high), klen * 3 + 8),
    |             ^^^^^^^^^^^^^^^^^^^ not found in this scope
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::crc_shift_iscsi_sse;
    |

error[E0425]: cannot find function `mm_crc32_u64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:141:33
    |
141 |             crc_shift_iscsi_sse(mm_crc32_u64(mm_crc32_u64(0, x0_low), x0_high), klen * 3 + 8),
    |                                 ^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:1
    |
 20 | pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
    | --------------------------------------------- similarly named function `_mm_crc32_u64` defined here
    |
help: the leading underscore in `_mm_crc32_u64` marks it as unused, consider renaming it to `mm_crc32_u64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:8
    |
 20 - pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
 20 + pub fn mm_crc32_u64(crc: u64, v: u64) -> u64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_crc32_u64;
    |

error[E0425]: cannot find function `mm_crc32_u64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:141:46
    |
141 |             crc_shift_iscsi_sse(mm_crc32_u64(mm_crc32_u64(0, x0_low), x0_high), klen * 3 + 8),
    |                                              ^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:1
    |
 20 | pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
    | --------------------------------------------- similarly named function `_mm_crc32_u64` defined here
    |
help: the leading underscore in `_mm_crc32_u64` marks it as unused, consider renaming it to `mm_crc32_u64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:8
    |
 20 - pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
 20 + pub fn mm_crc32_u64(crc: u64, v: u64) -> u64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_crc32_u64;
    |

error[E0425]: cannot find function `mm_crc32_u64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:149:16
    |
149 |         crc0 = mm_crc32_u64(crc0, *(buf as *const u64) ^ vc);
    |                ^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:1
    |
 20 | pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
    | --------------------------------------------- similarly named function `_mm_crc32_u64` defined here
    |
help: the leading underscore in `_mm_crc32_u64` marks it as unused, consider renaming it to `mm_crc32_u64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:8
    |
 20 - pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
 20 + pub fn mm_crc32_u64(crc: u64, v: u64) -> u64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_crc32_u64;
    |

error[E0425]: cannot find function `mm_crc32_u64` in this scope
   --> /home/muntasir/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/crc-fast-1.8.0/src/crc32/fusion/x86/iscsi/sse_pclmulqdq.rs:156:16
    |
156 |         crc0 = mm_crc32_u64(crc0, *(buf as *const u64));
    |                ^^^^^^^^^^^^
    |
   ::: /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:1
    |
 20 | pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
    | --------------------------------------------- similarly named function `_mm_crc32_u64` defined here
    |
help: the leading underscore in `_mm_crc32_u64` marks it as unused, consider renaming it to `mm_crc32_u64`
   --> /home/muntasir/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/x86_64/sse42.rs:20:8
    |
 20 - pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
 20 + pub fn mm_crc32_u64(crc: u64, v: u64) -> u64 {
    |
help: consider importing this function
    |
 11 + use crate::crc32::fusion::x86::mm_crc32_u64;
    |

error: `#[panic_handler]` function required, but not found

error: unwinding panics are not supported without std
  |
  = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
  = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem

Some errors have detailed explanations: E0412, E0425, E0433.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `crc-fast` (lib) due to 211 previous errors

There are a lot more.

Rust version is 1.91.1.

[onethumb]

@loadingalias Any insight?

[loadingalias]

@loadingalias Any insight?

On it. I'm super busy, but I'm going to try to see what's going on with it right now.

[loadingalias]

It turns out, a few pieces of the codebase aren't properly guarded for no_std. It's really just missing imports for x86 SIMD intrinsics, a few helper functions. The fusion module was being included in the no_std builds. Honestly, I don't know HOW that made it through the review... but it did.

It is a relatively simple fix. I'm running tests now... should submit the PR before the end of the night... worst case tomorrow AM (EST)! Sorry, man. My mistake.