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compiler-rt: upgrade to stage2 fn ptr semantics

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This commit is contained in:
Andrew Kelley 2022-04-28 17:11:14 -07:00
parent c5e847744c
commit 18d6523888
2 changed files with 18 additions and 7 deletions
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20
lib/std/special/compiler_rt/clzsi2_test.zig
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@ -1,13 +1,21 @@
const builtin = @import("builtin");
const clz = @import("count0bits.zig");
const testing = @import("std").testing;
fn test__clzsi2(a: u32, expected: i32) !void {
// XXX At high optimization levels this test may be horribly miscompiled if
// one of the naked implementations is selected.
var nakedClzsi2 = clz.__clzsi2;
var actualClzsi2 = @ptrCast(fn (a: i32) callconv(.C) i32, nakedClzsi2);
var x = @bitCast(i32, a);
var result = actualClzsi2(x);
const nakedClzsi2 = clz.__clzsi2;
const fnProto = fn (a: i32) callconv(.C) i32;
const fnProtoPtr = switch (builtin.zig_backend) {
.stage1 => fnProto,
else => *const fnProto,
};
const fn_ptr = switch (builtin.zig_backend) {
.stage1 => nakedClzsi2,
else => &nakedClzsi2,
};
const actualClzsi2 = @ptrCast(fnProtoPtr, fn_ptr);
const x = @bitCast(i32, a);
const result = actualClzsi2(x);
try testing.expectEqual(expected, result);
}

5
lib/std/special/compiler_rt/truncXfYf2.zig
View File

@ -4,6 +4,8 @@ const native_arch = builtin.cpu.arch;
// AArch64 is the only ABI (at the moment) to support f16 arguments without the
// need for extending them to wider fp types.
// TODO remove this; do this type selection in the language rather than
// here in compiler-rt.
pub const F16T = if (native_arch.isAARCH64()) f16 else u16;
pub fn __truncsfhf2(a: f32) callconv(.C) F16T {
@ -140,7 +142,8 @@ inline fn truncXfYf2(comptime dst_t: type, comptime src_t: type, a: src_t) dst_t
}
}
const result: dst_rep_t align(@alignOf(dst_t)) = absResult | @truncate(dst_rep_t, sign >> @intCast(SrcShift, srcBits - dstBits));
const result: dst_rep_t align(@alignOf(dst_t)) = absResult |
@truncate(dst_rep_t, sign >> @intCast(SrcShift, srcBits - dstBits));
return @bitCast(dst_t, result);
}