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mrustc (master)
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// Type your code here, or load an example. // As of Rust 1.75, small functions are automatically // marked as `#[inline]` so they will not show up in // the output when compiling with optimisations. Use // `#[no_mangle]` or `#[inline(never)]` to work around // this issue. // See https://github.com/compiler-explorer/compiler-explorer/issues/5939 #[no_mangle] pub fn r1(mut tmp_range: u32, probability : u32, mut tmp_value : u32) -> (u32,u32) { let split = ((((tmp_range - 0x1000000) >> 8) * probability) +0x1000000) & 0xff000000; // assert here to have a single cold code path that never // gets hit since tmp_range is always greater than split. #[cfg(all( not(target_feature = "lzcnt"), any(target_arch = "x86", target_arch = "x86_64") ))] assert!(tmp_range - split > 0); let bit = tmp_value >= split; if bit { tmp_range -= split; tmp_value -= split; } else { tmp_range = split; } let shift = tmp_range.leading_zeros(); tmp_value <<= shift; tmp_range <<= shift; (tmp_value, tmp_range) } const BITS_IN_BYTE: i32 = 8; const BITS_IN_VALUE: i32 = 32; const BITS_IN_VALUE_MINUS_LAST_BYTE: i32 = BITS_IN_VALUE - BITS_IN_BYTE; #[no_mangle] pub fn r2(mut tmp_range: u32, probability : u32, mut tmp_value : u32) -> (u32,u32) { let split = ((tmp_range >> BITS_IN_BYTE) * probability + ((256 - probability) << (BITS_IN_VALUE_MINUS_LAST_BYTE - BITS_IN_BYTE))) & (255 << BITS_IN_VALUE_MINUS_LAST_BYTE); #[cfg(all( not(target_feature = "lzcnt"), any(target_arch = "x86", target_arch = "x86_64") ))] assert!(tmp_range - split > 0); let bit = tmp_value >= split; if bit { tmp_range -= split; tmp_value -= split; } else { tmp_range = split; } let shift = tmp_range.leading_zeros(); tmp_value <<= shift; tmp_range <<= shift; (tmp_value, tmp_range) }
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