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std.zig.llvm.bitcode_writer: Fix word byte order on big endian systems.

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The bitcode format always uses little endian words. Prior to this commit, a
bitcode file produced on e.g. aarch64_be or s390x would fail to be loaded by
LLVM.
This commit is contained in:
Alex Rønne Petersen 2025-03-04 00:02:09 +01:00 committed by Andrew Kelley
parent 8363b95178
commit 3c924abb69
1 changed files with 4 additions and 4 deletions
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8
lib/std/zig/llvm/bitcode_writer.zig
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@ -68,13 +68,13 @@ pub fn BitcodeWriter(comptime types: []const type) type {
in_bits -= n; in_bits -= n;
if (self.bit_count != 0) return; if (self.bit_count != 0) return;
try self.buffer.append(self.bit_buffer); try self.buffer.append(std.mem.nativeToLittle(u32, self.bit_buffer));
self.bit_buffer = 0; self.bit_buffer = 0;
} }
// Write 32-bit chunks of input bits // Write 32-bit chunks of input bits
while (in_bits >= 32) { while (in_bits >= 32) {
try self.buffer.append(@truncate(in_buffer)); try self.buffer.append(std.mem.nativeToLittle(u32, @truncate(in_buffer)));
in_buffer >>= 31; in_buffer >>= 31;
in_buffer >>= 1; in_buffer >>= 1;
@ -153,7 +153,7 @@ pub fn BitcodeWriter(comptime types: []const type) type {
pub fn alignTo32(self: *BcWriter) Error!void { pub fn alignTo32(self: *BcWriter) Error!void {
if (self.bit_count == 0) return; if (self.bit_count == 0) return;
try self.buffer.append(self.bit_buffer); try self.buffer.append(std.mem.nativeToLittle(u32, self.bit_buffer));
self.bit_buffer = 0; self.bit_buffer = 0;
self.bit_count = 0; self.bit_count = 0;
} }
@ -209,7 +209,7 @@ pub fn BitcodeWriter(comptime types: []const type) type {
try self.bitcode.alignTo32(); try self.bitcode.alignTo32();
// Set the number of words in the block at the start of the block // Set the number of words in the block at the start of the block
self.bitcode.buffer.items[self.start] = @truncate(self.bitcode.length() - self.start - 1); self.bitcode.buffer.items[self.start] = std.mem.nativeToLittle(u32, @truncate(self.bitcode.length() - self.start - 1));
} }
pub fn writeUnabbrev(self: *Self, code: u32, values: []const u64) Error!void { pub fn writeUnabbrev(self: *Self, code: u32, values: []const u64) Error!void {