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Fix shifting limits and LLVM code gen bug relating to shifts

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gingerBill
2021-03-29 23:15:31 +01:00
parent 6fb0868517
commit 439e2c9242
3 changed files with 17 additions and 13 deletions
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src/ir.cpp
+7 -6
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@@ -4639,13 +4639,13 @@ handle_op:
irValue *bits = right;
irValue *max = ir_value_constant(type, exact_value_i64(8*type_size_of(type)));
irValue *less_equal_width = ir_emit(proc, ir_instr_binary_op(proc, Token_Lt, bits, max, t_llvm_bool));
irValue *bit_size = ir_value_constant(type, exact_value_i64(8*type_size_of(type)));
irValue *width_test = ir_emit(proc, ir_instr_binary_op(proc, Token_Lt, bits, bit_size, t_llvm_bool));
irValue *zero = ir_value_constant(type, exact_value_i64(0));
irValue *res = ir_emit(proc, ir_instr_binary_op(proc, op, left, bits, type));
return ir_emit_select(proc, less_equal_width, res, zero);
return ir_emit_select(proc, width_test, res, zero);
}
case Token_Shr:
{
@@ -4655,10 +4655,11 @@ handle_op:
irValue *bits = right;
irValue *max = ir_value_constant(type, exact_value_i64(8*type_size_of(type)));
irValue *less_equal_width = ir_emit(proc, ir_instr_binary_op(proc, Token_Lt, bits, max, t_llvm_bool));
irValue *bit_size = ir_value_constant(type, exact_value_i64(8*type_size_of(type)));
irValue *max = ir_value_constant(type, exact_value_i64(8*type_size_of(type)-1));
irValue *width_test = ir_emit(proc, ir_instr_binary_op(proc, Token_Lt, bits, bit_size, t_llvm_bool));
bits = ir_emit_select(proc, less_equal_width, bits, max);
bits = ir_emit_select(proc, width_test, bits, max);
return ir_emit(proc, ir_instr_binary_op(proc, op, left, bits, type));
}