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x86_64: fix struct_field_val crash

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This commit is contained in:
Jacob Young 2023-05-14 17:56:34 -04:00
parent 037bf1a580
commit 37ccf35ff2
1 changed files with 3 additions and 2 deletions
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5
src/arch/x86_64/CodeGen.zig
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@ -5411,6 +5411,7 @@ fn airStructFieldVal(self: *Self, inst: Air.Inst.Index) !void {
const field_ty = container_ty.structFieldType(index);
if (!field_ty.hasRuntimeBitsIgnoreComptime()) break :result .none;
const field_rc = regClassForType(field_ty);
const field_is_gp = field_rc.supersetOf(gp);
const src_mcv = try self.resolveInst(operand);
const field_off = switch (container_ty.containerLayout()) {
@ -5443,7 +5444,7 @@ fn airStructFieldVal(self: *Self, inst: Air.Inst.Index) !void {
return self.fail("TODO implement struct_field_val with large packed field", .{});
}
const dst_reg = try self.register_manager.allocReg(inst, gp);
const dst_reg = try self.register_manager.allocReg(if (field_is_gp) inst else null, gp);
const field_extra_bits = self.regExtraBits(field_ty);
const load_abi_size =
if (field_bit_off < field_extra_bits) field_abi_size else field_abi_size * 2;
@ -5494,7 +5495,7 @@ fn airStructFieldVal(self: *Self, inst: Air.Inst.Index) !void {
if (field_extra_bits > 0) try self.truncateRegister(field_ty, dst_reg);
const dst_mcv = MCValue{ .register = dst_reg };
break :result if (field_rc.supersetOf(gp))
break :result if (field_is_gp)
dst_mcv
else
try self.copyToRegisterWithInstTracking(inst, field_ty, dst_mcv);