Zig 0.17.0-dev (Split by item)

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selectznz

The function selectznz is a multi-limb conditional select.

Postconditions: eval out1 = (if arg1 = 0 then eval arg2 else eval arg3)

Input Bounds: arg1: [0x0 ~> 0x1] arg2: [[0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff]] arg3: [[0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff]] Output Bounds: out1: [[0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff], [0x0 ~> 0xffffffffffffffff]]

p256_64.selectznz

pub fn selectznz(out1: *[4]u64, arg1: u1, arg2: [4]u64, arg3: [4]u64) void

File

lib/std/crypto/pcurves/p256/p256_64.zig:1317

Code

pub fn selectznz(out1: *[4]u64, arg1: u1, arg2: [4]u64, arg3: [4]u64) void {
    @setRuntimeSafety(mode == .debug);

    var x1: u64 = undefined;
    cmovznzU64(&x1, arg1, (arg2[0]), (arg3[0]));
    var x2: u64 = undefined;
    cmovznzU64(&x2, arg1, (arg2[1]), (arg3[1]));
    var x3: u64 = undefined;
    cmovznzU64(&x3, arg1, (arg2[2]), (arg3[2]));
    var x4: u64 = undefined;
    cmovznzU64(&x4, arg1, (arg2[3]), (arg3[3]));
    out1[0] = x1;
    out1[1] = x2;
    out1[2] = x3;
    out1[3] = x4;
}