compiler: un-implement #19634

This commit reverts the handling of partially-undefined values in
bitcasting to transform these bits into an arbitrary numeric value,
like happens on `master` today.

As @andrewrk rightly points out, #19634 has unfortunate consequences
for the standard library, and likely requires more thought. To avoid
a major breaking change, it has been decided to revert this design
decision for now, and make a more informed decision further down the
line.

2 files changed, 0 insertions, 17 deletions

diff --git a/lib/std/net.zig b/lib/std/net.zig
index ddbb414705..3126bfa93b 100644
--- a/lib/std/net.zig
+++ b/lib/std/net.zig
@@ -278,9 +278,6 @@ pub const Ip4Address = extern struct {
             },
         };
         const out_ptr = mem.asBytes(&result.sa.addr);
-        if (@inComptime()) {
-            @memset(out_ptr, 0); // TODO: #19634
-        }
 
         var x: u8 = 0;
         var index: u8 = 0;
@@ -392,9 +389,6 @@ pub const Ip6Address = extern struct {
                 .addr = undefined,
             },
         };
-        if (@inComptime()) {
-            @memset(std.mem.asBytes(&result.sa.addr), 0); // TODO: #19634
-        }
         var ip_slice: *[16]u8 = result.sa.addr[0..];
 
         var tail: [16]u8 = undefined;
@@ -513,9 +507,6 @@ pub const Ip6Address = extern struct {
                 .addr = undefined,
             },
         };
-        if (@inComptime()) {
-            @memset(std.mem.asBytes(&result.sa.addr), 0); // TODO: #19634
-        }
         var ip_slice: *[16]u8 = result.sa.addr[0..];
 
         var tail: [16]u8 = undefined;
diff --git a/lib/std/packed_int_array.zig b/lib/std/packed_int_array.zig
index d76df4d04e..02c721e7cf 100644
--- a/lib/std/packed_int_array.zig
+++ b/lib/std/packed_int_array.zig
@@ -214,10 +214,6 @@ pub fn PackedIntArrayEndian(comptime Int: type, comptime endian: Endian, comptim
         /// or, more likely, an array literal.
         pub fn init(ints: [int_count]Int) Self {
             var self: Self = undefined;
-            if (@inComptime()) {
-                // TODO: #19634
-                @memset(&self.bytes, 0xAA);
-            }
             for (ints, 0..) |int, i| self.set(i, int);
             return self;
         }
@@ -225,10 +221,6 @@ pub fn PackedIntArrayEndian(comptime Int: type, comptime endian: Endian, comptim
         /// Initialize all entries of a packed array to the same value.
         pub fn initAllTo(int: Int) Self {
             var self: Self = undefined;
-            if (@inComptime()) {
-                // TODO: #19634
-                @memset(&self.bytes, 0xAA);
-            }
             self.setAll(int);
             return self;
         }