xsave.rs.html -- source
Description: Source to the Rust file `src/libcore/../stdsimd/coresimd/x86_64/xsave.rs`.
Keywords: rust, rustlang, rust-lang

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227

    //! `x86_64`'s `xsave` and `xsaveopt` target feature intrinsics

    #![cfg_attr(feature = "cargo-clippy", allow(clippy::stutter))]

    #[cfg(test)]
    use stdsimd_test::assert_instr;

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.xsave64"]
        fn xsave64(p: *mut u8, hi: u32, lo: u32) -> ();
        #[link_name = "llvm.x86.xrstor64"]
        fn xrstor64(p: *const u8, hi: u32, lo: u32) -> ();
        #[link_name = "llvm.x86.xsaveopt64"]
        fn xsaveopt64(p: *mut u8, hi: u32, lo: u32) -> ();
        #[link_name = "llvm.x86.xsavec64"]
        fn xsavec64(p: *mut u8, hi: u32, lo: u32) -> ();
        #[link_name = "llvm.x86.xsaves64"]
        fn xsaves64(p: *mut u8, hi: u32, lo: u32) -> ();
        #[link_name = "llvm.x86.xrstors64"]
        fn xrstors64(p: *const u8, hi: u32, lo: u32) -> ();
    }

    /// Perform a full or partial save of the enabled processor states to memory at
    /// `mem_addr`.
    ///
    /// State is saved based on bits `[62:0]` in `save_mask` and XCR0.
    /// `mem_addr` must be aligned on a 64-byte boundary.
    ///
    /// The format of the XSAVE area is detailed in Section 13.4, “XSAVE Area,” of
    /// Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_xsave64)
    #[inline]
    #[target_feature(enable = "xsave")]
    #[cfg_attr(test, assert_instr(xsave64))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _xsave64(mem_addr: *mut u8, save_mask: u64) {
        xsave64(mem_addr, (save_mask >> 32) as u32, save_mask as u32);
    }

    /// Perform a full or partial restore of the enabled processor states using
    /// the state information stored in memory at `mem_addr`.
    ///
    /// State is restored based on bits `[62:0]` in `rs_mask`, `XCR0`, and
    /// `mem_addr.HEADER.XSTATE_BV`. `mem_addr` must be aligned on a 64-byte
    /// boundary.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_xrstor64)
    #[inline]
    #[target_feature(enable = "xsave")]
    #[cfg_attr(test, assert_instr(xrstor64))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _xrstor64(mem_addr: *const u8, rs_mask: u64) {
        xrstor64(mem_addr, (rs_mask >> 32) as u32, rs_mask as u32);
    }

    /// Perform a full or partial save of the enabled processor states to memory at
    /// `mem_addr`.
    ///
    /// State is saved based on bits `[62:0]` in `save_mask` and `XCR0`.
    /// `mem_addr` must be aligned on a 64-byte boundary. The hardware may optimize
    /// the manner in which data is saved. The performance of this instruction will
    /// be equal to or better than using the `XSAVE64` instruction.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_xsaveopt64)
    #[inline]
    #[target_feature(enable = "xsave,xsaveopt")]
    #[cfg_attr(test, assert_instr(xsaveopt64))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _xsaveopt64(mem_addr: *mut u8, save_mask: u64) {
        xsaveopt64(mem_addr, (save_mask >> 32) as u32, save_mask as u32);
    }

    /// Perform a full or partial save of the enabled processor states to memory
    /// at `mem_addr`.
    ///
    /// `xsavec` differs from `xsave` in that it uses compaction and that it may
    /// use init optimization. State is saved based on bits `[62:0]` in `save_mask`
    /// and `XCR0`. `mem_addr` must be aligned on a 64-byte boundary.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_xsavec64)
    #[inline]
    #[target_feature(enable = "xsave,xsavec")]
    #[cfg_attr(test, assert_instr(xsavec64))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _xsavec64(mem_addr: *mut u8, save_mask: u64) {
        xsavec64(mem_addr, (save_mask >> 32) as u32, save_mask as u32);
    }

    /// Perform a full or partial save of the enabled processor states to memory at
    /// `mem_addr`
    ///
    /// `xsaves` differs from xsave in that it can save state components
    /// corresponding to bits set in `IA32_XSS` `MSR` and that it may use the
    /// modified optimization. State is saved based on bits `[62:0]` in `save_mask`
    /// and `XCR0`. `mem_addr` must be aligned on a 64-byte boundary.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_xsaves64)
    #[inline]
    #[target_feature(enable = "xsave,xsaves")]
    #[cfg_attr(test, assert_instr(xsaves64))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _xsaves64(mem_addr: *mut u8, save_mask: u64) {
        xsaves64(mem_addr, (save_mask >> 32) as u32, save_mask as u32);
    }

    /// Perform a full or partial restore of the enabled processor states using the
    /// state information stored in memory at `mem_addr`.
    ///
    /// `xrstors` differs from `xrstor` in that it can restore state components
    /// corresponding to bits set in the `IA32_XSS` `MSR`; `xrstors` cannot restore
    /// from an `xsave` area in which the extended region is in the standard form.
    /// State is restored based on bits `[62:0]` in `rs_mask`, `XCR0`, and
    /// `mem_addr.HEADER.XSTATE_BV`. `mem_addr` must be aligned on a 64-byte
    /// boundary.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_xrstors64)
    #[inline]
    #[target_feature(enable = "xsave,xsaves")]
    #[cfg_attr(test, assert_instr(xrstors64))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _xrstors64(mem_addr: *const u8, rs_mask: u64) {
        xrstors64(mem_addr, (rs_mask >> 32) as u32, rs_mask as u32);
    }

    // FIXME: https://github.com/rust-lang-nursery/stdsimd/issues/209
    // All these tests fail with Intel SDE.
    /*
    #[cfg(test)]
    mod tests {
        use coresimd::x86::x86_64::xsave;
        use stdsimd_test::simd_test;
        use std::fmt;

        // FIXME: https://github.com/rust-lang-nursery/stdsimd/issues/209
        #[repr(align(64))]
        struct XsaveArea {
            // max size for 256-bit registers is 800 bytes:
            // see https://software.intel.com/en-us/node/682996
            // max size for 512-bit registers is 2560 bytes:
            // FIXME: add source
            data: [u8; 2560],
        }

        impl XsaveArea {
            fn new() -> XsaveArea {
                XsaveArea { data: [0; 2560] }
            }
            fn ptr(&mut self) -> *mut u8 {
                &mut self.data[0] as *mut _ as *mut u8
            }
        }

        impl PartialEq<XsaveArea> for XsaveArea {
            fn eq(&self, other: &XsaveArea) -> bool {
                for i in 0..self.data.len() {
                    if self.data[i] != other.data[i] {
                        return false;
                    }
                }
                true
            }
        }

        impl fmt::Debug for XsaveArea {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                write!(f, "[")?;
                for i in 0..self.data.len() {
                    write!(f, "{}", self.data[i])?;
                    if i != self.data.len() - 1 {
                        write!(f, ", ")?;
                    }
                }
                write!(f, "]")
            }
        }

        #[simd_test(enable = "xsave")]
        unsafe fn xsave64() {
            let m = 0xFFFFFFFFFFFFFFFF_u64; //< all registers
            let mut a = XsaveArea::new();
            let mut b = XsaveArea::new();

            xsave::_xsave64(a.ptr(), m);
            xsave::_xrstor64(a.ptr(), m);
            xsave::_xsave64(b.ptr(), m);
            assert_eq!(a, b);
        }

        #[simd_test(enable = "xsave,xsaveopt")]
        unsafe fn xsaveopt64() {
            let m = 0xFFFFFFFFFFFFFFFF_u64; //< all registers
            let mut a = XsaveArea::new();
            let mut b = XsaveArea::new();

            xsave::_xsaveopt64(a.ptr(), m);
            xsave::_xrstor64(a.ptr(), m);
            xsave::_xsaveopt64(b.ptr(), m);
            assert_eq!(a, b);
        }

        #[simd_test(enable = "xsave,xsavec")]
        unsafe fn xsavec64() {
            let m = 0xFFFFFFFFFFFFFFFF_u64; //< all registers
            let mut a = XsaveArea::new();
            let mut b = XsaveArea::new();

            xsave::_xsavec64(a.ptr(), m);
            xsave::_xrstor64(a.ptr(), m);
            xsave::_xsavec64(b.ptr(), m);
            assert_eq!(a, b);
        }

        #[simd_test(enable = "xsave,xsaves")]
        unsafe fn xsaves64() {
            let m = 0xFFFFFFFFFFFFFFFF_u64; //< all registers
            let mut a = XsaveArea::new();
            let mut b = XsaveArea::new();

            xsave::_xsaves64(a.ptr(), m);
            xsave::_xrstors64(a.ptr(), m);
            xsave::_xsaves64(b.ptr(), m);
            assert_eq!(a, b);
        }
    }
    */

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)