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subdf3.zig (735B) - Raw

      1 const common = @import("./common.zig");
      2 const addf3 = @import("./addf3.zig").addf3;
      3 
      4 pub const panic = common.panic;
      5 
      6 comptime {
      7     if (common.want_aeabi) {
      8         @export(&__aeabi_dsub, .{ .name = "__aeabi_dsub", .linkage = common.linkage, .visibility = common.visibility });
      9     } else {
     10         @export(&__subdf3, .{ .name = "__subdf3", .linkage = common.linkage, .visibility = common.visibility });
     11     }
     12 }
     13 
     14 fn __subdf3(a: f64, b: f64) callconv(.c) f64 {
     15     return sub(a, b);
     16 }
     17 
     18 fn __aeabi_dsub(a: f64, b: f64) callconv(.{ .arm_aapcs = .{} }) f64 {
     19     return sub(a, b);
     20 }
     21 
     22 inline fn sub(a: f64, b: f64) f64 {
     23     const neg_b = @as(f64, @bitCast(@as(u64, @bitCast(b)) ^ (@as(u64, 1) << 63)));
     24     return addf3(f64, a, neg_b);
     25 }