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[CIR] Implement CK_LValueToRValueBitCast for ComplexType #1751

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[CIR] Implement CK_LValueToRValueBitCast for ComplexType #1751

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aee4ec9
[CIR] Implement CK_LValueToRValueBitCast for ComplexType
AmrDeveloper Jul 21, 2025
c3fe763
Update the test snippets
AmrDeveloper Jul 25, 2025
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10 changes: 8 additions & 2 deletions clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -431,8 +431,14 @@ mlir::Value ComplexExprEmitter::emitCast(CastKind CK, Expr *Op,
case CK_LValueBitCast:
llvm_unreachable("NYI");

case CK_LValueToRValueBitCast:
llvm_unreachable("NYI");
case CK_LValueToRValueBitCast: {
LValue SourceLVal = CGF.emitLValue(Op);
Address Addr = SourceLVal.getAddress().withElementType(
Builder, CGF.convertTypeForMem(DestTy));
LValue DestLV = CGF.makeAddrLValue(Addr, DestTy);
DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
return emitLoadOfLValue(DestLV, Op->getExprLoc());
}

case CK_BitCast:
case CK_BaseToDerived:
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23 changes: 23 additions & 0 deletions clang/test/CIR/CodeGen/complex-cast.c
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Expand Up @@ -199,6 +199,29 @@ void complex_to_bool() {

// CHECK: }

struct CX {
double real;
double imag;
};

void lvalue_to_rvalue_bitcast() {
struct CX a;
double _Complex b = __builtin_bit_cast(double _Complex, a);
}

// CHECK-LABEL: @lvalue_to_rvalue_bitcast()

// CIR-BEFORE: %{{.+}} = cir.cast(bitcast, %{{.+}} : !cir.ptr<!rec_CX>), !cir.ptr<!cir.complex<!cir.double>>

// CIR-AFTER: %{{.+}} = cir.cast(bitcast, %{{.+}} : !cir.ptr<!rec_CX>), !cir.ptr<!cir.complex<!cir.double>>

// LLVM: %[[PTR_ADDR:.*]] = alloca %struct.CX, i64 1, align 8
// LLVM: %[[COMPLEX_ADDR:.*]] = alloca { double, double }, i64 1, align 8
// LLVM: %[[PTR_TO_COMPLEX:.*]] = load { double, double }, ptr %[[PTR_ADDR]], align 8
// LLVM: store { double, double } %[[PTR_TO_COMPLEX]], ptr %[[COMPLEX_ADDR]], align 8

// CHECK: }

void promotion() {
cd = cf + cf;
}
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