diff --git a/test/behavior.zig b/test/behavior.zig
index ba65fc4fad..7523c60ae8 100644
--- a/test/behavior.zig
+++ b/test/behavior.zig
@@ -237,6 +237,7 @@ test {
     _ = @import("behavior/void.zig");
     _ = @import("behavior/while.zig");
     _ = @import("behavior/widening.zig");
+    _ = @import("behavior/abs.zig");
 
     if (builtin.cpu.arch == .wasm32) {
         _ = @import("behavior/wasm.zig");
diff --git a/test/behavior/abs.zig b/test/behavior/abs.zig
new file mode 100644
index 0000000000..eefea306c4
--- /dev/null
+++ b/test/behavior/abs.zig
@@ -0,0 +1,371 @@
+const builtin = @import("builtin");
+const std = @import("std");
+const expect = std.testing.expect;
+
+test "@abs integers" {
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+
+    try comptime testAbsIntegers();
+    try testAbsIntegers();
+}
+
+fn testAbsIntegers() !void {
+    {
+        var x: i32 = -1000;
+        try expect(@abs(x) == 1000);
+    }
+    {
+        var x: i32 = 0;
+        try expect(@abs(x) == 0);
+    }
+    {
+        var x: i32 = 1000;
+        try expect(@abs(x) == 1000);
+    }
+    {
+        var x: i64 = std.math.minInt(i64);
+        try expect(@abs(x) == @as(u64, -std.math.minInt(i64)));
+    }
+    {
+        var x: i5 = -1;
+        try expect(@abs(x) == 1);
+    }
+    {
+        var x: i5 = -5;
+        try expect(@abs(x) == 5);
+    }
+    comptime {
+        try expect(@abs(@as(i2, -2)) == 2);
+    }
+}
+
+test "@abs unsigned integers" {
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+
+    try comptime testAbsUnsignedIntegers();
+    try testAbsUnsignedIntegers();
+}
+
+fn testAbsUnsignedIntegers() !void {
+    {
+        var x: u32 = 1000;
+        try expect(@abs(x) == 1000);
+    }
+    {
+        var x: u32 = 0;
+        try expect(@abs(x) == 0);
+    }
+    {
+        var x: u32 = 1000;
+        try expect(@abs(x) == 1000);
+    }
+    {
+        var x: u5 = 1;
+        try expect(@abs(x) == 1);
+    }
+    {
+        var x: u5 = 5;
+        try expect(@abs(x) == 5);
+    }
+    comptime {
+        try expect(@abs(@as(u2, 2)) == 2);
+    }
+}
+
+test "@abs floats" {
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+
+    try comptime testAbsFloats(f16);
+    if (builtin.zig_backend != .stage2_x86_64) try testAbsFloats(f16);
+    try comptime testAbsFloats(f32);
+    try testAbsFloats(f32);
+    try comptime testAbsFloats(f64);
+    try testAbsFloats(f64);
+    try comptime testAbsFloats(f80);
+    if (builtin.zig_backend != .stage2_x86_64 and builtin.zig_backend != .stage2_wasm) try testAbsFloats(f80);
+    try comptime testAbsFloats(f128);
+    if (builtin.zig_backend != .stage2_x86_64 and builtin.zig_backend != .stage2_wasm) try testAbsFloats(f128);
+}
+
+fn testAbsFloats(comptime T: type) !void {
+    {
+        var x: T = -2.62;
+        try expect(@abs(x) == 2.62);
+    }
+    {
+        var x: T = 2.62;
+        try expect(@abs(x) == 2.62);
+    }
+    {
+        var x: T = 0.0;
+        try expect(@abs(x) == 0.0);
+    }
+    {
+        var x: T = -std.math.pi;
+        try expect(@abs(x) == std.math.pi);
+    }
+
+    {
+        var x: T = -std.math.inf(T);
+        try expect(@abs(x) == std.math.inf(T));
+    }
+    {
+        var x: T = std.math.inf(T);
+        try expect(@abs(x) == std.math.inf(T));
+    }
+    comptime {
+        try expect(@abs(@as(T, -std.math.e)) == std.math.e);
+    }
+}
+
+test "@abs int vectors" {
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+
+    try comptime testAbsIntVectors(1);
+    try testAbsIntVectors(1);
+    try comptime testAbsIntVectors(2);
+    try testAbsIntVectors(2);
+    try comptime testAbsIntVectors(3);
+    try testAbsIntVectors(3);
+    try comptime testAbsIntVectors(4);
+    try testAbsIntVectors(4);
+    try comptime testAbsIntVectors(8);
+    try testAbsIntVectors(8);
+    try comptime testAbsIntVectors(16);
+    try testAbsIntVectors(16);
+    try comptime testAbsIntVectors(17);
+    try testAbsIntVectors(17);
+}
+
+fn testAbsIntVectors(comptime len: comptime_int) !void {
+    const I32 = @Vector(len, i32);
+    const U32 = @Vector(len, u32);
+    const I64 = @Vector(len, i64);
+    const U64 = @Vector(len, u64);
+    {
+        var x: I32 = @splat(-10);
+        var y: U32 = @splat(10);
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+    {
+        var x: I32 = @splat(10);
+        var y: U32 = @splat(10);
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+    {
+        var x: I32 = @splat(0);
+        var y: U32 = @splat(0);
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+    {
+        var x: I64 = @splat(-10);
+        var y: U64 = @splat(10);
+        try expect(std.mem.eql(u64, &@as([len]u64, y), &@as([len]u64, @abs(x))));
+    }
+    {
+        var x: I64 = @splat(std.math.minInt(i64));
+        var y: U64 = @splat(-std.math.minInt(i64));
+        try expect(std.mem.eql(u64, &@as([len]u64, y), &@as([len]u64, @abs(x))));
+    }
+    {
+        var x = std.simd.repeat(len, @Vector(4, i32){ -2, 5, std.math.minInt(i32), -7 });
+        var y = std.simd.repeat(len, @Vector(4, u32){ 2, 5, -std.math.minInt(i32), 7 });
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+}
+
+test "@abs unsigned int vectors" {
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+
+    try comptime testAbsUnsignedIntVectors(1);
+    try testAbsUnsignedIntVectors(1);
+    try comptime testAbsUnsignedIntVectors(2);
+    try testAbsUnsignedIntVectors(2);
+    try comptime testAbsUnsignedIntVectors(3);
+    try testAbsUnsignedIntVectors(3);
+    try comptime testAbsUnsignedIntVectors(4);
+    try testAbsUnsignedIntVectors(4);
+    try comptime testAbsUnsignedIntVectors(8);
+    try testAbsUnsignedIntVectors(8);
+    try comptime testAbsUnsignedIntVectors(16);
+    try testAbsUnsignedIntVectors(16);
+    try comptime testAbsUnsignedIntVectors(17);
+    try testAbsUnsignedIntVectors(17);
+}
+
+fn testAbsUnsignedIntVectors(comptime len: comptime_int) !void {
+    const U32 = @Vector(len, u32);
+    const U64 = @Vector(len, u64);
+    {
+        var x: U32 = @splat(10);
+        var y: U32 = @splat(10);
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+    {
+        var x: U32 = @splat(10);
+        var y: U32 = @splat(10);
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+    {
+        var x: U32 = @splat(0);
+        var y: U32 = @splat(0);
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+    {
+        var x: U64 = @splat(10);
+        var y: U64 = @splat(10);
+        try expect(std.mem.eql(u64, &@as([len]u64, y), &@as([len]u64, @abs(x))));
+    }
+    {
+        var x = std.simd.repeat(len, @Vector(3, u32){ 2, 5, 7 });
+        var y = std.simd.repeat(len, @Vector(3, u32){ 2, 5, 7 });
+        try expect(std.mem.eql(u32, &@as([len]u32, y), &@as([len]u32, @abs(x))));
+    }
+}
+
+test "@abs float vectors" {
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+
+    // https://github.com/ziglang/zig/issues/12827
+    if (builtin.zig_backend == .stage2_llvm and
+        builtin.os.tag == .macos and
+        builtin.target.cpu.arch == .x86_64) return error.SkipZigTest;
+
+    @setEvalBranchQuota(2000);
+    try comptime testAbsFloatVectors(f16, 1);
+    try testAbsFloatVectors(f16, 1);
+    try comptime testAbsFloatVectors(f16, 2);
+    try testAbsFloatVectors(f16, 2);
+    try comptime testAbsFloatVectors(f16, 3);
+    try testAbsFloatVectors(f16, 3);
+    try comptime testAbsFloatVectors(f16, 4);
+    try testAbsFloatVectors(f16, 4);
+    try comptime testAbsFloatVectors(f16, 8);
+    try testAbsFloatVectors(f16, 8);
+    try comptime testAbsFloatVectors(f16, 16);
+    try testAbsFloatVectors(f16, 16);
+    try comptime testAbsFloatVectors(f16, 17);
+
+    try testAbsFloatVectors(f32, 17);
+    try comptime testAbsFloatVectors(f32, 1);
+    try testAbsFloatVectors(f32, 1);
+    try comptime testAbsFloatVectors(f32, 2);
+    try testAbsFloatVectors(f32, 2);
+    try comptime testAbsFloatVectors(f32, 3);
+    try testAbsFloatVectors(f32, 3);
+    try comptime testAbsFloatVectors(f32, 4);
+    try testAbsFloatVectors(f32, 4);
+    try comptime testAbsFloatVectors(f32, 8);
+    try testAbsFloatVectors(f32, 8);
+    try comptime testAbsFloatVectors(f32, 16);
+    try testAbsFloatVectors(f32, 16);
+    try comptime testAbsFloatVectors(f32, 17);
+    try testAbsFloatVectors(f32, 17);
+
+    try comptime testAbsFloatVectors(f64, 1);
+    try testAbsFloatVectors(f64, 1);
+    try comptime testAbsFloatVectors(f64, 2);
+    try testAbsFloatVectors(f64, 2);
+    try comptime testAbsFloatVectors(f64, 3);
+    try testAbsFloatVectors(f64, 3);
+    try comptime testAbsFloatVectors(f64, 4);
+    try testAbsFloatVectors(f64, 4);
+    try comptime testAbsFloatVectors(f64, 8);
+    try testAbsFloatVectors(f64, 8);
+    try comptime testAbsFloatVectors(f64, 16);
+    try testAbsFloatVectors(f64, 16);
+    try comptime testAbsFloatVectors(f64, 17);
+    try testAbsFloatVectors(f64, 17);
+
+    try comptime testAbsFloatVectors(f80, 1);
+    try testAbsFloatVectors(f80, 1);
+    try comptime testAbsFloatVectors(f80, 2);
+    try testAbsFloatVectors(f80, 2);
+    try comptime testAbsFloatVectors(f80, 3);
+    try testAbsFloatVectors(f80, 3);
+    try comptime testAbsFloatVectors(f80, 4);
+    try testAbsFloatVectors(f80, 4);
+    try comptime testAbsFloatVectors(f80, 8);
+    try testAbsFloatVectors(f80, 8);
+    try comptime testAbsFloatVectors(f80, 16);
+    try testAbsFloatVectors(f80, 16);
+    try comptime testAbsFloatVectors(f80, 17);
+    try testAbsFloatVectors(f80, 17);
+
+    try comptime testAbsFloatVectors(f128, 1);
+    try testAbsFloatVectors(f128, 1);
+    try comptime testAbsFloatVectors(f128, 2);
+    try testAbsFloatVectors(f128, 2);
+    try comptime testAbsFloatVectors(f128, 3);
+    try testAbsFloatVectors(f128, 3);
+    try comptime testAbsFloatVectors(f128, 4);
+    try testAbsFloatVectors(f128, 4);
+    try comptime testAbsFloatVectors(f128, 8);
+    try testAbsFloatVectors(f128, 8);
+    try comptime testAbsFloatVectors(f128, 16);
+    try testAbsFloatVectors(f128, 16);
+    try comptime testAbsFloatVectors(f128, 17);
+    try testAbsFloatVectors(f128, 17);
+}
+
+fn testAbsFloatVectors(comptime T: type, comptime len: comptime_int) !void {
+    const V = @Vector(len, T);
+    {
+        var x: V = @splat(-7.5);
+        var y: V = @splat(7.5);
+        try expect(std.mem.eql(T, &@as([len]T, y), &@as([len]T, @abs(x))));
+    }
+    {
+        var x: V = @splat(7.5);
+        var y: V = @splat(7.5);
+        try expect(std.mem.eql(T, &@as([len]T, y), &@as([len]T, @abs(x))));
+    }
+    {
+        var x: V = @splat(0.0);
+        var y: V = @splat(0.0);
+        try expect(std.mem.eql(T, &@as([len]T, y), &@as([len]T, @abs(x))));
+    }
+    {
+        var x: V = @splat(-std.math.pi);
+        var y: V = @splat(std.math.pi);
+        try expect(std.mem.eql(T, &@as([len]T, y), &@as([len]T, @abs(x))));
+    }
+    {
+        var x: V = @splat(std.math.pi);
+        var y: V = @splat(std.math.pi);
+        try expect(std.mem.eql(T, &@as([len]T, y), &@as([len]T, @abs(x))));
+    }
+}