zig/lib/compiler_rt/subtf3.zig
mlugg f26dda2117 all: migrate code to new cast builtin syntax
Most of this migration was performed automatically with `zig fmt`. There
were a few exceptions which I had to manually fix:

* `@alignCast` and `@addrSpaceCast` cannot be automatically rewritten
* `@truncate`'s fixup is incorrect for vectors
* Test cases are not formatted, and their error locations change
2023-06-24 16:56:39 -07:00

26 lines
825 B
Zig

const common = @import("./common.zig");
pub const panic = common.panic;
comptime {
if (common.want_ppc_abi) {
@export(__subtf3, .{ .name = "__subkf3", .linkage = common.linkage, .visibility = common.visibility });
} else if (common.want_sparc_abi) {
@export(_Qp_sub, .{ .name = "_Qp_sub", .linkage = common.linkage, .visibility = common.visibility });
}
@export(__subtf3, .{ .name = "__subtf3", .linkage = common.linkage, .visibility = common.visibility });
}
pub fn __subtf3(a: f128, b: f128) callconv(.C) f128 {
return sub(a, b);
}
fn _Qp_sub(c: *f128, a: *const f128, b: *const f128) callconv(.C) void {
c.* = sub(a.*, b.*);
}
inline fn sub(a: f128, b: f128) f128 {
const neg_b = @as(f128, @bitCast(@as(u128, @bitCast(b)) ^ (@as(u128, 1) << 127)));
return a + neg_b;
}