123 lines
4.4 KiB
Zig
123 lines
4.4 KiB
Zig
///! The quoted behavior definitions are from
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///! https://gcc.gnu.org/onlinedocs/gcc-12.1.0/gccint/Soft-float-library-routines.html#Soft-float-library-routines
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const common = @import("./common.zig");
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const comparef = @import("./comparef.zig");
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pub const panic = common.panic;
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comptime {
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if (common.want_ppc_abi) {
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@export(__eqkf2, .{ .name = "__eqkf2", .linkage = common.linkage });
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@export(__nekf2, .{ .name = "__nekf2", .linkage = common.linkage });
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@export(__ltkf2, .{ .name = "__ltkf2", .linkage = common.linkage });
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@export(__lekf2, .{ .name = "__lekf2", .linkage = common.linkage });
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} else if (common.want_sparc_abi) {
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@export(_Qp_cmp, .{ .name = "_Qp_cmp", .linkage = common.linkage });
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@export(_Qp_feq, .{ .name = "_Qp_feq", .linkage = common.linkage });
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@export(_Qp_fne, .{ .name = "_Qp_fne", .linkage = common.linkage });
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@export(_Qp_flt, .{ .name = "_Qp_flt", .linkage = common.linkage });
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@export(_Qp_fle, .{ .name = "_Qp_fle", .linkage = common.linkage });
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@export(_Qp_fgt, .{ .name = "_Qp_fgt", .linkage = common.linkage });
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@export(_Qp_fge, .{ .name = "_Qp_fge", .linkage = common.linkage });
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} else {
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@export(__eqtf2, .{ .name = "__eqtf2", .linkage = common.linkage });
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@export(__netf2, .{ .name = "__netf2", .linkage = common.linkage });
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@export(__letf2, .{ .name = "__letf2", .linkage = common.linkage });
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@export(__cmptf2, .{ .name = "__cmptf2", .linkage = common.linkage });
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@export(__lttf2, .{ .name = "__lttf2", .linkage = common.linkage });
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}
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}
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/// "These functions calculate a <=> b. That is, if a is less than b, they return -1;
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/// if a is greater than b, they return 1; and if a and b are equal they return 0.
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/// If either argument is NaN they return 1..."
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///
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/// Note that this matches the definition of `__letf2`, `__eqtf2`, `__netf2`, `__cmptf2`,
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/// and `__lttf2`.
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fn __cmptf2(a: f128, b: f128) callconv(.C) i32 {
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return @enumToInt(comparef.cmpf2(f128, comparef.LE, a, b));
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}
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/// "These functions return a value less than or equal to zero if neither argument is NaN,
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/// and a is less than or equal to b."
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fn __letf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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/// "These functions return zero if neither argument is NaN, and a and b are equal."
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/// Note that due to some kind of historical accident, __eqtf2 and __netf2 are defined
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/// to have the same return value.
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fn __eqtf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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/// "These functions return a nonzero value if either argument is NaN, or if a and b are unequal."
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/// Note that due to some kind of historical accident, __eqtf2 and __netf2 are defined
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/// to have the same return value.
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fn __netf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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/// "These functions return a value less than zero if neither argument is NaN, and a
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/// is strictly less than b."
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fn __lttf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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fn __eqkf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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fn __nekf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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fn __ltkf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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fn __lekf2(a: f128, b: f128) callconv(.C) i32 {
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return __cmptf2(a, b);
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}
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const SparcFCMP = enum(i32) {
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Equal = 0,
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Less = 1,
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Greater = 2,
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Unordered = 3,
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};
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fn _Qp_cmp(a: *const f128, b: *const f128) callconv(.C) i32 {
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return @enumToInt(comparef.cmpf2(f128, SparcFCMP, a.*, b.*));
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}
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fn _Qp_feq(a: *const f128, b: *const f128) callconv(.C) bool {
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return @intToEnum(SparcFCMP, _Qp_cmp(a, b)) == .Equal;
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}
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fn _Qp_fne(a: *const f128, b: *const f128) callconv(.C) bool {
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return @intToEnum(SparcFCMP, _Qp_cmp(a, b)) != .Equal;
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}
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fn _Qp_flt(a: *const f128, b: *const f128) callconv(.C) bool {
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return @intToEnum(SparcFCMP, _Qp_cmp(a, b)) == .Less;
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}
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fn _Qp_fgt(a: *const f128, b: *const f128) callconv(.C) bool {
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return @intToEnum(SparcFCMP, _Qp_cmp(a, b)) == .Greater;
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}
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fn _Qp_fge(a: *const f128, b: *const f128) callconv(.C) bool {
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return switch (@intToEnum(SparcFCMP, _Qp_cmp(a, b))) {
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.Equal, .Greater => true,
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.Less, .Unordered => false,
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};
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}
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fn _Qp_fle(a: *const f128, b: *const f128) callconv(.C) bool {
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return switch (@intToEnum(SparcFCMP, _Qp_cmp(a, b))) {
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.Equal, .Less => true,
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.Greater, .Unordered => false,
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};
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}
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