Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 330 insertions, 0 deletions

diff --git a/third_party/rust/ahash/src/operations.rs b/third_party/rust/ahash/src/operations.rs
new file mode 100644
index 0000000000..b71fd5a743
--- /dev/null
+++ b/third_party/rust/ahash/src/operations.rs
@@ -0,0 +1,330 @@
+use crate::convert::*;
+
+/// This is a constant with a lot of special properties found by automated search.
+/// See the unit tests below. (Below are alternative values)
+#[cfg(all(target_feature = "ssse3", not(miri)))]
+const SHUFFLE_MASK: u128 = 0x020a0700_0c01030e_050f0d08_06090b04_u128;
+//const SHUFFLE_MASK: u128 = 0x000d0702_0a040301_05080f0c_0e0b0609_u128;
+//const SHUFFLE_MASK: u128 = 0x040A0700_030E0106_0D050F08_020B0C09_u128;
+
+#[inline(always)]
+pub(crate) const fn folded_multiply(s: u64, by: u64) -> u64 {
+    let result = (s as u128).wrapping_mul(by as u128);
+    ((result & 0xffff_ffff_ffff_ffff) as u64) ^ ((result >> 64) as u64)
+}
+
+
+/// Given a small (less than 8 byte slice) returns the same data stored in two u32s.
+/// (order of and non-duplication of bytes is NOT guaranteed)
+#[inline(always)]
+pub(crate) fn read_small(data: &[u8]) -> [u64; 2] {
+    debug_assert!(data.len() <= 8);
+    if data.len() >= 2 {
+        if data.len() >= 4 {
+            //len 4-8
+            [data.read_u32().0 as u64, data.read_last_u32() as u64]
+        } else {
+            //len 2-3
+            [data.read_u16().0 as u64, data[data.len() - 1] as u64]
+        }
+    } else {
+        if data.len() > 0 {
+            [data[0] as u64, data[0] as u64]
+        } else {
+            [0, 0]
+        }
+    }
+}
+
+#[inline(always)]
+pub(crate) fn shuffle(a: u128) -> u128 {
+    #[cfg(all(target_feature = "ssse3", not(miri)))]
+    {
+        #[cfg(target_arch = "x86")]
+        use core::arch::x86::*;
+        #[cfg(target_arch = "x86_64")]
+        use core::arch::x86_64::*;
+        use core::mem::transmute;
+        unsafe { transmute(_mm_shuffle_epi8(transmute(a), transmute(SHUFFLE_MASK))) }
+    }
+    #[cfg(not(all(target_feature = "ssse3", not(miri))))]
+    {
+        a.swap_bytes()
+    }
+}
+
+#[allow(unused)] //not used by fallback
+#[inline(always)]
+pub(crate) fn add_and_shuffle(a: u128, b: u128) -> u128 {
+    let sum = add_by_64s(a.convert(), b.convert());
+    shuffle(sum.convert())
+}
+
+#[allow(unused)] //not used by fallbac
+#[inline(always)]
+pub(crate) fn shuffle_and_add(base: u128, to_add: u128) -> u128 {
+    let shuffled: [u64; 2] = shuffle(base).convert();
+    add_by_64s(shuffled, to_add.convert()).convert()
+}
+
+#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "sse2", not(miri)))]
+#[inline(always)]
+pub(crate) fn add_by_64s(a: [u64; 2], b: [u64; 2]) -> [u64; 2] {
+    use core::mem::transmute;
+    unsafe {
+        #[cfg(target_arch = "x86")]
+        use core::arch::x86::*;
+        #[cfg(target_arch = "x86_64")]
+        use core::arch::x86_64::*;
+        transmute(_mm_add_epi64(transmute(a), transmute(b)))
+    }
+}
+
+#[cfg(not(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "sse2", not(miri))))]
+#[inline(always)]
+pub(crate) fn add_by_64s(a: [u64; 2], b: [u64; 2]) -> [u64; 2] {
+    [a[0].wrapping_add(b[0]), a[1].wrapping_add(b[1])]
+}
+
+#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)))]
+#[allow(unused)]
+#[inline(always)]
+pub(crate) fn aesenc(value: u128, xor: u128) -> u128 {
+    #[cfg(target_arch = "x86")]
+    use core::arch::x86::*;
+    #[cfg(target_arch = "x86_64")]
+    use core::arch::x86_64::*;
+    use core::mem::transmute;
+    unsafe {
+        let value = transmute(value);
+        transmute(_mm_aesenc_si128(value, transmute(xor)))
+    }
+}
+
+#[cfg(all(any(target_arch = "arm", target_arch = "aarch64"), target_feature = "crypto", not(miri), feature = "stdsimd"))]
+#[allow(unused)]
+#[inline(always)]
+pub(crate) fn aesenc(value: u128, xor: u128) -> u128 {
+    #[cfg(target_arch = "arm")]
+    use core::arch::arm::*;
+    #[cfg(target_arch = "aarch64")]
+    use core::arch::aarch64::*;
+    use core::mem::transmute;
+    unsafe {
+        let value = transmute(value);
+        transmute(vaesmcq_u8(vaeseq_u8(value, transmute(xor))))
+    }
+}
+
+#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)))]
+#[allow(unused)]
+#[inline(always)]
+pub(crate) fn aesdec(value: u128, xor: u128) -> u128 {
+    #[cfg(target_arch = "x86")]
+    use core::arch::x86::*;
+    #[cfg(target_arch = "x86_64")]
+    use core::arch::x86_64::*;
+    use core::mem::transmute;
+    unsafe {
+        let value = transmute(value);
+        transmute(_mm_aesdec_si128(value, transmute(xor)))
+    }
+}
+
+#[cfg(all(any(target_arch = "arm", target_arch = "aarch64"), target_feature = "crypto", not(miri), feature = "stdsimd"))]
+#[allow(unused)]
+#[inline(always)]
+pub(crate) fn aesdec(value: u128, xor: u128) -> u128 {
+    #[cfg(target_arch = "arm")]
+    use core::arch::arm::*;
+    #[cfg(target_arch = "aarch64")]
+    use core::arch::aarch64::*;
+    use core::mem::transmute;
+    unsafe {
+        let value = transmute(value);
+        transmute(vaesimcq_u8(vaesdq_u8(value, transmute(xor))))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::convert::Convert;
+
+    // This is code to search for the shuffle constant
+    //
+    //thread_local! { static MASK: Cell<u128> = Cell::new(0); }
+    //
+    // fn shuffle(a: u128) -> u128 {
+    //     use std::intrinsics::transmute;
+    //     #[cfg(target_arch = "x86")]
+    //     use core::arch::x86::*;
+    //     #[cfg(target_arch = "x86_64")]
+    //     use core::arch::x86_64::*;
+    //     MASK.with(|mask| {
+    //         unsafe { transmute(_mm_shuffle_epi8(transmute(a), transmute(mask.get()))) }
+    //     })
+    // }
+    //
+    // #[test]
+    // fn find_shuffle() {
+    //     use rand::prelude::*;
+    //     use SliceRandom;
+    //     use std::panic;
+    //     use std::io::Write;
+    //
+    //     let mut value: [u8; 16] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ,13, 14, 15];
+    //     let mut rand = thread_rng();
+    //     let mut successful_list = HashMap::new();
+    //     for _attempt in 0..10000000 {
+    //         rand.shuffle(&mut value);
+    //         let test_val = value.convert();
+    //         MASK.with(|mask| {
+    //             mask.set(test_val);
+    //         });
+    //         if let Ok(successful) = panic::catch_unwind(|| {
+    //             test_shuffle_does_not_collide_with_aes();
+    //             test_shuffle_moves_high_bits();
+    //             test_shuffle_moves_every_value();
+    //             //test_shuffle_does_not_loop();
+    //             value
+    //         }) {
+    //             let successful: u128 = successful.convert();
+    //             successful_list.insert(successful, iters_before_loop());
+    //         }
+    //     }
+    //     let write_file = File::create("/tmp/output").unwrap();
+    //     let mut writer = BufWriter::new(&write_file);
+    //
+    //     for success in successful_list {
+    //         writeln!(writer, "Found successful: {:x?} - {:?}", success.0, success.1);
+    //     }
+    // }
+    //
+    // fn iters_before_loop() -> u32 {
+    //     let numbered = 0x00112233_44556677_8899AABB_CCDDEEFF;
+    //     let mut shuffled = shuffle(numbered);
+    //     let mut count = 0;
+    //     loop {
+    //         // println!("{:>16x}", shuffled);
+    //         if numbered == shuffled {
+    //             break;
+    //         }
+    //         count += 1;
+    //         shuffled = shuffle(shuffled);
+    //     }
+    //     count
+    // }
+
+    #[cfg(all(
+        any(target_arch = "x86", target_arch = "x86_64"),
+        target_feature = "ssse3",
+        target_feature = "aes",
+        not(miri)
+    ))]
+    #[test]
+    fn test_shuffle_does_not_collide_with_aes() {
+        let mut value: [u8; 16] = [0; 16];
+        let zero_mask_enc = aesenc(0, 0);
+        let zero_mask_dec = aesdec(0, 0);
+        for index in 0..16 {
+            value[index] = 1;
+            let excluded_positions_enc: [u8; 16] = aesenc(value.convert(), zero_mask_enc).convert();
+            let excluded_positions_dec: [u8; 16] = aesdec(value.convert(), zero_mask_dec).convert();
+            let actual_location: [u8; 16] = shuffle(value.convert()).convert();
+            for pos in 0..16 {
+                if actual_location[pos] != 0 {
+                    assert_eq!(
+                        0, excluded_positions_enc[pos],
+                        "Forward Overlap between {:?} and {:?} at {}",
+                        excluded_positions_enc, actual_location, index
+                    );
+                    assert_eq!(
+                        0, excluded_positions_dec[pos],
+                        "Reverse Overlap between {:?} and {:?} at {}",
+                        excluded_positions_dec, actual_location, index
+                    );
+                }
+            }
+            value[index] = 0;
+        }
+    }
+
+    #[test]
+    fn test_shuffle_contains_each_value() {
+        let value: [u8; 16] = 0x00010203_04050607_08090A0B_0C0D0E0F_u128.convert();
+        let shuffled: [u8; 16] = shuffle(value.convert()).convert();
+        for index in 0..16_u8 {
+            assert!(shuffled.contains(&index), "Value is missing {}", index);
+        }
+    }
+
+    #[test]
+    fn test_shuffle_moves_every_value() {
+        let mut value: [u8; 16] = [0; 16];
+        for index in 0..16 {
+            value[index] = 1;
+            let shuffled: [u8; 16] = shuffle(value.convert()).convert();
+            assert_eq!(0, shuffled[index], "Value is not moved {}", index);
+            value[index] = 0;
+        }
+    }
+
+    #[test]
+    fn test_shuffle_moves_high_bits() {
+        assert!(
+            shuffle(1) > (1_u128 << 80),
+            "Low bits must be moved to other half {:?} -> {:?}",
+            0,
+            shuffle(1)
+        );
+
+        assert!(
+            shuffle(1_u128 << 58) >= (1_u128 << 64),
+            "High bits must be moved to other half {:?} -> {:?}",
+            7,
+            shuffle(1_u128 << 58)
+        );
+        assert!(
+            shuffle(1_u128 << 58) < (1_u128 << 112),
+            "High bits must not remain high {:?} -> {:?}",
+            7,
+            shuffle(1_u128 << 58)
+        );
+        assert!(
+            shuffle(1_u128 << 64) < (1_u128 << 64),
+            "Low bits must be moved to other half {:?} -> {:?}",
+            8,
+            shuffle(1_u128 << 64)
+        );
+        assert!(
+            shuffle(1_u128 << 64) >= (1_u128 << 16),
+            "Low bits must not remain low {:?} -> {:?}",
+            8,
+            shuffle(1_u128 << 64)
+        );
+
+        assert!(
+            shuffle(1_u128 << 120) < (1_u128 << 50),
+            "High bits must be moved to low half {:?} -> {:?}",
+            15,
+            shuffle(1_u128 << 120)
+        );
+    }
+
+    #[cfg(all(
+        any(target_arch = "x86", target_arch = "x86_64"),
+        target_feature = "ssse3",
+        not(miri)
+    ))]
+    #[test]
+    fn test_shuffle_does_not_loop() {
+        let numbered = 0x00112233_44556677_8899AABB_CCDDEEFF;
+        let mut shuffled = shuffle(numbered);
+        for count in 0..100 {
+            // println!("{:>16x}", shuffled);
+            assert_ne!(numbered, shuffled, "Equal after {} vs {:x}", count, shuffled);
+            shuffled = shuffle(shuffled);
+        }
+    }
+}