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llvm: Stop emitting shl/xor ops for constant packed structs.

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This is no longer supported in LLVM 19; fall back to the generic code path.
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Alex Rønne Petersen 2024-08-23 19:32:31 +02:00 committed by Andrew Kelley
parent da8b7fb0c0
commit a27f4072ec
1 changed files with 1 additions and 22 deletions
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23
src/codegen/llvm.zig
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@ -3761,28 +3761,7 @@ pub const Object = struct {
},
.ptr => return o.builder.convConst(try o.lowerPtr(arg_val, 0), llvm_int_ty),
.aggregate => switch (ip.indexToKey(ty.toIntern())) {
.struct_type => {
const struct_type = ip.loadStructType(ty.toIntern());
assert(struct_type.haveLayout(ip));
assert(struct_type.layout == .@"packed");
comptime assert(Type.packed_struct_layout_version == 2);
var running_int = try o.builder.intConst(llvm_int_ty, 0);
var running_bits: u16 = 0;
for (struct_type.field_types.get(ip), 0..) |field_ty, field_index| {
if (!Type.fromInterned(field_ty).hasRuntimeBitsIgnoreComptime(zcu)) continue;
const shift_rhs = try o.builder.intConst(llvm_int_ty, running_bits);
const field_val = try o.lowerValueToInt(llvm_int_ty, (try val.fieldValue(pt, field_index)).toIntern());
const shifted = try o.builder.binConst(.shl, field_val, shift_rhs);
running_int = try o.builder.binConst(.xor, running_int, shifted);
const ty_bit_size: u16 = @intCast(Type.fromInterned(field_ty).bitSize(zcu));
running_bits += ty_bit_size;
}
return running_int;
},
.vector_type => {},
.struct_type, .vector_type => {},
else => unreachable,
},
.un => |un| {