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9f224ebd9a
* remove `LoweringError` error set from `Emit.zig` - it actually was less than helpful; it's better to either not throw an error since there can be instructions with mismatching operand sizes such as `movsx` or assert on a by instruction-basis. Currently, let's just pass through and see how we fare. * when moving integers into registers, check for signedness and move with zero- or sign-extension if source operand is smaller than 8 bytes. The destination operand is always assumed to be full-width, i.e., 8 bytes. * clean up `airTrunc` a little to match the rest of CodeGen inst implementations.
79 lines
1.9 KiB
Zig
79 lines
1.9 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const expect = std.testing.expect;
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test "truncate u0 to larger integer allowed and has comptime known result" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var x: u0 = 0;
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const y = @truncate(u8, x);
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comptime try expect(y == 0);
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}
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test "truncate.u0.literal" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var z = @truncate(u0, 0);
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try expect(z == 0);
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}
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test "truncate.u0.const" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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const c0: usize = 0;
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var z = @truncate(u0, c0);
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try expect(z == 0);
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}
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test "truncate.u0.var" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var d: u8 = 2;
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var z = @truncate(u0, d);
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try expect(z == 0);
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}
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test "truncate i0 to larger integer allowed and has comptime known result" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var x: i0 = 0;
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const y = @truncate(i8, x);
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comptime try expect(y == 0);
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}
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test "truncate.i0.literal" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var z = @truncate(i0, 0);
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try expect(z == 0);
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}
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test "truncate.i0.const" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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const c0: isize = 0;
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var z = @truncate(i0, c0);
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try expect(z == 0);
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}
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test "truncate.i0.var" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var d: i8 = 2;
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var z = @truncate(i0, d);
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try expect(z == 0);
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}
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test "truncate on comptime integer" {
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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var x = @truncate(u16, 9999);
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try expect(x == 9999);
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var y = @truncate(u16, -21555);
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try expect(y == 0xabcd);
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var z = @truncate(i16, -65537);
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try expect(z == -1);
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var w = @truncate(u1, 1 << 100);
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try expect(w == 0);
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}
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