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normalize bool cmp

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kalsprite
2026-08-24 18:34:59 -07:00
parent 0d1635366f
commit 4ecaa7dfd9
4 changed files with 77 additions and 0 deletions
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18
src/llvm_backend_expr.cpp
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@@ -3860,6 +3860,24 @@ gb_internal lbValue lb_emit_comp(lbProcedure *p, TokenKind op_kind, lbValue left
rhs = lb_emit_byte_swap(p, {rhs, pt}, pt).value;
}
if (is_type_boolean(a) && is_type_boolean(b) && (op_kind == Token_CmpEq || op_kind == Token_NotEq)) {
// anything not 0 is true, which is what control flow already tests for
bool lhs_is_const = LLVMIsAConstantInt(lhs) != nullptr;
bool rhs_is_const = LLVMIsAConstantInt(rhs) != nullptr;
if (lhs_is_const != rhs_is_const) {
// against a literal, the truthiness test is the whole comparison
LLVMValueRef v = rhs_is_const ? lhs : rhs;
LLVMValueRef c = rhs_is_const ? rhs : lhs;
bool is_true = LLVMConstIntGetZExtValue(c) != 0;
pred = ((op_kind == Token_CmpEq) == is_true) ? LLVMIntNE : LLVMIntEQ;
lhs = v;
rhs = LLVMConstNull(LLVMTypeOf(v));
} else {
lhs = LLVMBuildICmp(p->builder, LLVMIntNE, lhs, LLVMConstNull(LLVMTypeOf(lhs)), "");
rhs = LLVMBuildICmp(p->builder, LLVMIntNE, rhs, LLVMConstNull(LLVMTypeOf(rhs)), "");
}
}
res.value = LLVMBuildICmp(p->builder, pred, lhs, rhs, "");
} else if (is_type_float(a)) {
LLVMRealPredicate pred = {};