motiejus/zig

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git clone https://git.jakstys.lt/motiejus/zig.git
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lib/compiler_rt/subdf3.zig (623B) - Raw

      1 const compiler_rt = @import("../compiler_rt.zig");
      2 const addf3 = @import("./addf3.zig").addf3;
      3 const symbol = @import("../compiler_rt.zig").symbol;
      4 
      5 comptime {
      6     if (compiler_rt.want_aeabi) {
      7         symbol(&__aeabi_dsub, "__aeabi_dsub");
      8     } else {
      9         symbol(&__subdf3, "__subdf3");
     10     }
     11 }
     12 
     13 fn __subdf3(a: f64, b: f64) callconv(.c) f64 {
     14     return sub(a, b);
     15 }
     16 
     17 fn __aeabi_dsub(a: f64, b: f64) callconv(.{ .arm_aapcs = .{} }) f64 {
     18     return sub(a, b);
     19 }
     20 
     21 inline fn sub(a: f64, b: f64) f64 {
     22     const neg_b = @as(f64, @bitCast(@as(u64, @bitCast(b)) ^ (@as(u64, 1) << 63)));
     23     return addf3(f64, a, neg_b);
     24 }