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LLVM backend: support non-byte-sized memset

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Also introduce memset_safe AIR tag and support it in C backend and LLVM
backend.
This commit is contained in:
Andrew Kelley
2023-04-21 23:05:36 -07:00
parent 25d11283b7
commit 057c950093
14 changed files with 192 additions and 31 deletions
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44
test/behavior/basic.zig
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@@ -353,6 +353,50 @@ fn f2(x: bool) []const u8 {
return (if (x) &fA else &fB)();
}
test "@memset on array pointers" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
try testMemsetArray();
// TODO this doesn't pass yet
// try comptime testMemsetArray();
}
fn testMemsetArray() !void {
{
// memset array to non-undefined, ABI size == 1
var foo: [20]u8 = undefined;
@memset(&foo, 'A');
try expect(foo[0] == 'A');
try expect(foo[11] == 'A');
try expect(foo[19] == 'A');
// memset array to undefined, ABI size == 1
@setRuntimeSafety(true);
@memset(&foo, undefined);
try expect(foo[0] == 0xaa);
try expect(foo[11] == 0xaa);
try expect(foo[19] == 0xaa);
}
{
// memset array to non-undefined, ABI size > 1
var foo: [20]u32 = undefined;
@memset(&foo, 1234);
try expect(foo[0] == 1234);
try expect(foo[11] == 1234);
try expect(foo[19] == 1234);
// memset array to undefined, ABI size > 1
@setRuntimeSafety(true);
@memset(&foo, undefined);
try expect(foo[0] == 0xaaaaaaaa);
try expect(foo[11] == 0xaaaaaaaa);
try expect(foo[19] == 0xaaaaaaaa);
}
}
test "memcpy and memset intrinsics" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;