0556a2ba53
Finishes cleanups that I started in other commits in this branch. * Use common.linkage for all exports instead of redoing the logic in each file. * Remove pointless `@setRuntimeSafety` calls. * Avoid redundantly exporting multiple versions of functions. For example, if PPC wants `ceilf128` then don't also export `ceilq`; similarly if ARM wants `__aeabi_ddiv` then don't also export `__divdf3`. * Use `inline` for helper functions instead of making inline calls at callsites.
47 lines
1.2 KiB
Zig
47 lines
1.2 KiB
Zig
//! negv - negate oVerflow
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//! * @panic, if result can not be represented
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//! - negvXi4_generic for unoptimized version
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const std = @import("std");
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const builtin = @import("builtin");
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const common = @import("common.zig");
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pub const panic = common.panic;
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comptime {
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@export(__negvsi2, .{ .name = "__negvsi2", .linkage = common.linkage });
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@export(__negvdi2, .{ .name = "__negvdi2", .linkage = common.linkage });
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@export(__negvti2, .{ .name = "__negvti2", .linkage = common.linkage });
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}
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pub fn __negvsi2(a: i32) callconv(.C) i32 {
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return negvXi(i32, a);
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}
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pub fn __negvdi2(a: i64) callconv(.C) i64 {
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return negvXi(i64, a);
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}
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pub fn __negvti2(a: i128) callconv(.C) i128 {
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return negvXi(i128, a);
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}
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inline fn negvXi(comptime ST: type, a: ST) ST {
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const UT = switch (ST) {
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i32 => u32,
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i64 => u64,
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i128 => u128,
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else => unreachable,
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};
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const N: UT = @bitSizeOf(ST);
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const min: ST = @bitCast(ST, (@as(UT, 1) << (N - 1)));
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if (a == min)
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@panic("compiler_rt negv: overflow");
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return -a;
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}
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test {
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_ = @import("negvsi2_test.zig");
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_ = @import("negvdi2_test.zig");
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_ = @import("negvti2_test.zig");
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}
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