Skip to content

[CIR] Implement CK_LValueToRValueBitCast for ComplexType #150296

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Jul 24, 2025
Merged

[CIR] Implement CK_LValueToRValueBitCast for ComplexType #150296

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
670aae7
[CIR] Implement CK_LValueToRValueBitCast for ComplexType
AmrDeveloper Jul 23, 2025
94d7f7f
Update the test case
AmrDeveloper Jul 24, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 6 additions & 2 deletions clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -194,8 +194,12 @@ mlir::Value ComplexExprEmitter::emitCast(CastKind ck, Expr *op,
}

case CK_LValueToRValueBitCast: {
cgf.cgm.errorNYI("ComplexExprEmitter::emitCast CK_LValueToRValueBitCast");
return {};
LValue sourceLVal = cgf.emitLValue(op);
Address addr = sourceLVal.getAddress().withElementType(
builder, cgf.convertTypeForMem(destTy));
LValue destLV = cgf.makeAddrLValue(addr, destTy);
assert(!cir::MissingFeatures::opTBAA());
return emitLoadOfLValue(destLV, op->getExprLoc());
}

case CK_BitCast:
Expand Down
30 changes: 30 additions & 0 deletions clang/test/CIR/CodeGen/complex-cast.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -326,3 +326,33 @@ void complex_to_complex_cast() {
// OGCG: store i32 %[[REAL_INT_CAST]], ptr {{.*}}, align 4
// OGCG: store i32 %[[IMAG_INT_CAST]], ptr getelementptr inbounds nuw ({ i32, i32 }, ptr {{.*}}, i32 0, i32 1), align 4

struct CX {
double real;
double imag;
};

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


// 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

// OGCG: %[[A_ADDR:.*]] = alloca %struct.CX, align 8
// OGCG: %[[B_ADDR:.*]] = alloca { double, double }, align 8
// OGCG: %[[A_REAL_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[A_ADDR]], i32 0, i32 0
// OGCG: %[[A_REAL:.*]] = load double, ptr %[[A_REAL_PTR]], align 8
// OGCG: %[[A_IMAG_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[A_ADDR]], i32 0, i32 1
// OGCG: %[[A_IMAG:.*]] = load double, ptr %[[A_IMAG_PTR]], align 8
// OGCG: %[[B_REAL_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[B_ADDR]], i32 0, i32 0
// OGCG: %[[B_IMAG_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[B_ADDR]], i32 0, i32 1
// OGCG: store double %[[A_REAL]], ptr %[[B_REAL_PTR]], align 8
// OGCG: store double %[[A_IMAG]], ptr %[[B_IMAG_PTR]], align 8