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405ff911da
- abs can only overflow, if a == MIN - comparing the sign change from wrapping addition is branchless - tests: MIN, MIN+1,..MIN+4, -42, -7, -1, 0, 1, 7.. See #1290
31 lines
1.5 KiB
Zig
31 lines
1.5 KiB
Zig
const absv = @import("absv.zig");
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const testing = @import("std").testing;
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fn test__absvti2(a: i128, expected: i128) !void {
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var result = absv.__absvti2(a);
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try testing.expectEqual(expected, result);
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}
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test "absvti2" {
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// -2^127 <= i128 <= 2^127-1
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// 2^127 = 170141183460469231731687303715884105728
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// 2^127+1 = 170141183460469231731687303715884105727
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// TODO write panic handler for testing panics
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//try test__absvti2(-170141183460469231731687303715884105728, -5); // tested with return -5; and panic
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try test__absvti2(-170141183460469231731687303715884105727, 170141183460469231731687303715884105727);
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try test__absvti2(-170141183460469231731687303715884105726, 170141183460469231731687303715884105726);
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try test__absvti2(-170141183460469231731687303715884105725, 170141183460469231731687303715884105725);
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try test__absvti2(-170141183460469231731687303715884105724, 170141183460469231731687303715884105724);
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try test__absvti2(-42, 42);
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try test__absvti2(-7, 7);
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try test__absvti2(-1, 1);
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try test__absvti2(0, 0);
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try test__absvti2(1, 1);
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try test__absvti2(7, 7);
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try test__absvti2(42, 42);
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try test__absvti2(170141183460469231731687303715884105724, 170141183460469231731687303715884105724);
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try test__absvti2(170141183460469231731687303715884105725, 170141183460469231731687303715884105725);
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try test__absvti2(170141183460469231731687303715884105726, 170141183460469231731687303715884105726);
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try test__absvti2(170141183460469231731687303715884105727, 170141183460469231731687303715884105727);
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}
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