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Make ~some_bit_set work on only the possible bits by doing a mask with the full set

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gingerBill
2024-08-30 10:48:21 +01:00
parent b020b91df2
commit 38ea276231
2 changed files with 96 additions and 2 deletions
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12
src/llvm_backend_expr.cpp
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@@ -136,6 +136,11 @@ gb_internal lbValue lb_emit_unary_arith(lbProcedure *p, TokenKind op, lbValue x,
switch (op) {
case Token_Xor:
opv = LLVMBuildNot(p->builder, v, "");
if (is_type_bit_set(elem_type)) {
ExactValue ev_mask = exact_bit_set_all_set_mask(elem_type);
lbValue mask = lb_const_value(p->module, elem_type, ev_mask);
opv = LLVMBuildAnd(p->builder, opv, mask.value, "");
}
break;
case Token_Sub:
if (is_type_float(elem_type)) {
@@ -176,8 +181,13 @@ gb_internal lbValue lb_emit_unary_arith(lbProcedure *p, TokenKind op, lbValue x,
if (op == Token_Xor) {
lbValue cmp = {};
cmp.value = LLVMBuildNot(p->builder, x.value, "");
cmp.type = x.type;
cmp.value = LLVMBuildNot(p->builder, x.value, "");
if (is_type_bit_set(x.type)) {
ExactValue ev_mask = exact_bit_set_all_set_mask(x.type);
lbValue mask = lb_const_value(p->module, x.type, ev_mask);
cmp.value = LLVMBuildAnd(p->builder, cmp.value, mask.value, "");
}
return lb_emit_conv(p, cmp, type);
}