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@shlExact fixups

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* Add clarification in langref
* move test case to behavior tests
This commit is contained in:
Andrew Kelley 2024-01-04 00:44:44 -07:00
parent 10016e0368
commit 52ebba6bdf
3 changed files with 7 additions and 6 deletions
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5
doc/langref.html.in
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@ -9163,6 +9163,11 @@ test "@setRuntimeSafety" {
The type of {#syntax#}shift_amt{#endsyntax#} is an unsigned integer with {#syntax#}log2(@typeInfo(T).Int.bits){#endsyntax#} bits. The type of {#syntax#}shift_amt{#endsyntax#} is an unsigned integer with {#syntax#}log2(@typeInfo(T).Int.bits){#endsyntax#} bits.
This is because {#syntax#}shift_amt >= @typeInfo(T).Int.bits{#endsyntax#} is undefined behavior. This is because {#syntax#}shift_amt >= @typeInfo(T).Int.bits{#endsyntax#} is undefined behavior.
</p> </p>
<p>
{#syntax#}comptime_int{#endsyntax#} is modeled as an integer with an infinite number of bits,
meaning that in such case, {#syntax#}@shlExact{#endsyntax#} always produces a result and
cannot produce a compile error.
</p>
{#see_also|@shrExact|@shlWithOverflow#} {#see_also|@shrExact|@shlWithOverflow#}
{#header_close#} {#header_close#}

2
test/behavior/math.zig
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@ -1314,6 +1314,8 @@ test "exact shift left" {
try testShlExact(0b00110101); try testShlExact(0b00110101);
try comptime testShlExact(0b00110101); try comptime testShlExact(0b00110101);
if (@shlExact(1, 1) != 2) @compileError("should be 2");
} }
fn testShlExact(x: u8) !void { fn testShlExact(x: u8) !void {
const shifted = @shlExact(x, 2); const shifted = @shlExact(x, 2);

6
test/cases/shl_exact_comptime_int_lhs.zig
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@ -1,6 +0,0 @@
export fn entry() void {
if (@shlExact(1, 1) != 2) @compileError("should be 2");
}
// compile
// output_mode=Obj