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https://codeberg.org/ziglang/zig.git
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20328e976f
- adds __cmpsi2, __cmpdi2, __cmpti2 - adds __ucmpsi2, __ucmpdi2, __ucmpti2 - use 2 if statements with 2 temporaries and a constant - tests: MIN, MIN+1, MIN/2, -1, 0, 1, MAX/2, MAX-1, MAX if applicable See #1290
45 lines
1.1 KiB
Zig
45 lines
1.1 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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// cmp - signed compare
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// - cmpXi2_generic for unoptimized little and big endian
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// ucmp - unsigned compare
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// - ucmpXi2_generic for unoptimized little and big endian
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// a < b => 0
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// a == b => 1
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// a > b => 2
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fn XcmpXi2_generic(comptime T: type) fn (a: T, b: T) callconv(.C) i32 {
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return struct {
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fn f(a: T, b: T) callconv(.C) i32 {
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@setRuntimeSafety(builtin.is_test);
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var cmp1: i32 = 0;
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var cmp2: i32 = 0;
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if (a > b)
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cmp1 = 1;
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if (a < b)
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cmp2 = 1;
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return cmp1 - cmp2 + 1;
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}
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}.f;
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}
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pub const __cmpsi2 = XcmpXi2_generic(i32);
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pub const __cmpdi2 = XcmpXi2_generic(i64);
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pub const __cmpti2 = XcmpXi2_generic(i128);
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pub const __ucmpsi2 = XcmpXi2_generic(u32);
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pub const __ucmpdi2 = XcmpXi2_generic(u64);
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pub const __ucmpti2 = XcmpXi2_generic(u128);
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test {
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_ = @import("cmpsi2_test.zig");
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_ = @import("cmpdi2_test.zig");
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_ = @import("cmpti2_test.zig");
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_ = @import("ucmpsi2_test.zig");
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_ = @import("ucmpdi2_test.zig");
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_ = @import("ucmpti2_test.zig");
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}
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