diff options
Diffstat (limited to 'library/stdarch/crates/core_arch/src/arm/v6.rs')
-rw-r--r-- | library/stdarch/crates/core_arch/src/arm/v6.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/library/stdarch/crates/core_arch/src/arm/v6.rs b/library/stdarch/crates/core_arch/src/arm/v6.rs new file mode 100644 index 000000000..5df30cd62 --- /dev/null +++ b/library/stdarch/crates/core_arch/src/arm/v6.rs @@ -0,0 +1,49 @@ +//! ARMv6 intrinsics. +//! +//! The reference is [ARMv6-M Architecture Reference Manual][armv6m]. +//! +//! [armv6m]: +//! http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0419c/index. +//! html + +#[cfg(test)] +use stdarch_test::assert_instr; + +/// Reverse the order of the bytes. +#[inline] +#[cfg_attr(test, assert_instr(rev))] +pub unsafe fn _rev_u16(x: u16) -> u16 { + x.swap_bytes() as u16 +} + +/// Reverse the order of the bytes. +#[inline] +#[cfg_attr(test, assert_instr(rev))] +pub unsafe fn _rev_u32(x: u32) -> u32 { + x.swap_bytes() as u32 +} + +#[cfg(test)] +mod tests { + use crate::core_arch::arm::v6; + + #[test] + fn _rev_u16() { + unsafe { + assert_eq!( + v6::_rev_u16(0b0000_0000_1111_1111_u16), + 0b1111_1111_0000_0000_u16 + ); + } + } + + #[test] + fn _rev_u32() { + unsafe { + assert_eq!( + v6::_rev_u32(0b0000_0000_1111_1111_0000_0000_1111_1111_u32), + 0b1111_1111_0000_0000_1111_1111_0000_0000_u32 + ); + } + } +} |