[CIR] Implement CK_LValueToRValueBitCast for ComplexType #150296
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AmrDeveloper
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andykaylor,
bcardosolopes,
lanza and
xlauko
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llvmbot
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@llvm/pr-subscribers-clangir Author: Amr Hesham (AmrDeveloper) ChangesThis change adds support for CK_LValueToRValueBitCast for ComplexType Full diff: https://github.com/llvm/llvm-project/pull/150296.diff 2 Files Affected:
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
index d52da0cb32c53..7f2e2ce311846 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
@@ -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:
diff --git a/clang/test/CIR/CodeGen/complex-cast.cpp b/clang/test/CIR/CodeGen/complex-cast.cpp
index 94f47e4730cc2..a5ae21e82b7c6 100644
--- a/clang/test/CIR/CodeGen/complex-cast.cpp
+++ b/clang/test/CIR/CodeGen/complex-cast.cpp
@@ -326,3 +326,28 @@ 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
+
+void lvalue_to_rvalue_bitcast() {
+ void *a;
+ int _Complex b = __builtin_bit_cast(int _Complex, a);
+}
+
+// CIR-BEFORE: %{{.*}} = cir.cast(bitcast, %{{.*}} : !cir.ptr<!cir.ptr<!void>>), !cir.ptr<!cir.complex<!s32i>>
+
+// CIR-AFTER: %{{.*}} = cir.cast(bitcast, %{{.*}} : !cir.ptr<!cir.ptr<!void>>), !cir.ptr<!cir.complex<!s32i>>
+
+// LLVM: %[[PTR_ADDR:.*]] = alloca ptr, i64 1, align 8
+// LLVM: %[[COMPLEX_ADDR:.*]] = alloca { i32, i32 }, i64 1, align 4
+// LLVM: %[[PTR_TO_COMPLEX:.*]] = load { i32, i32 }, ptr %[[PTR_ADDR]], align 8
+// LLVM: store { i32, i32 } %[[PTR_TO_COMPLEX]], ptr %[[COMPLEX_ADDR]], align 4
+
+// OGCG: %[[A_ADDR:.*]] = alloca ptr, align 8
+// OGCG: %[[B_ADDR:.*]] = alloca { i32, i32 }, align 4
+// OGCG: %[[A_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[A_ADDR]], i32 0, i32 0
+// OGCG: %[[A_REAL:.*]] = load i32, ptr %[[A_REAL_PTR]], align 8
+// OGCG: %[[A_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[A_ADDR]], i32 0, i32 1
+// OGCG: %[[A_IMAG:.*]] = load i32, ptr %[[A_IMAG_PTR]], align 4
+// OGCG: %[[B_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[B_ADDR]], i32 0, i32 0
+// OGCG: %[[B_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[B_ADDR]], i32 0, i32 1
+// OGCG: store i32 %[[A_REAL]], ptr %[[B_REAL_PTR]], align 4
+// OGCG: store i32 %[[A_IMAG]], ptr %[[B_IMAG_PTR]], align 4
|
Member
|
@llvm/pr-subscribers-clang Author: Amr Hesham (AmrDeveloper) ChangesThis change adds support for CK_LValueToRValueBitCast for ComplexType Full diff: https://github.com/llvm/llvm-project/pull/150296.diff 2 Files Affected:
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
index d52da0cb32c53..7f2e2ce311846 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
@@ -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:
diff --git a/clang/test/CIR/CodeGen/complex-cast.cpp b/clang/test/CIR/CodeGen/complex-cast.cpp
index 94f47e4730cc2..a5ae21e82b7c6 100644
--- a/clang/test/CIR/CodeGen/complex-cast.cpp
+++ b/clang/test/CIR/CodeGen/complex-cast.cpp
@@ -326,3 +326,28 @@ 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
+
+void lvalue_to_rvalue_bitcast() {
+ void *a;
+ int _Complex b = __builtin_bit_cast(int _Complex, a);
+}
+
+// CIR-BEFORE: %{{.*}} = cir.cast(bitcast, %{{.*}} : !cir.ptr<!cir.ptr<!void>>), !cir.ptr<!cir.complex<!s32i>>
+
+// CIR-AFTER: %{{.*}} = cir.cast(bitcast, %{{.*}} : !cir.ptr<!cir.ptr<!void>>), !cir.ptr<!cir.complex<!s32i>>
+
+// LLVM: %[[PTR_ADDR:.*]] = alloca ptr, i64 1, align 8
+// LLVM: %[[COMPLEX_ADDR:.*]] = alloca { i32, i32 }, i64 1, align 4
+// LLVM: %[[PTR_TO_COMPLEX:.*]] = load { i32, i32 }, ptr %[[PTR_ADDR]], align 8
+// LLVM: store { i32, i32 } %[[PTR_TO_COMPLEX]], ptr %[[COMPLEX_ADDR]], align 4
+
+// OGCG: %[[A_ADDR:.*]] = alloca ptr, align 8
+// OGCG: %[[B_ADDR:.*]] = alloca { i32, i32 }, align 4
+// OGCG: %[[A_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[A_ADDR]], i32 0, i32 0
+// OGCG: %[[A_REAL:.*]] = load i32, ptr %[[A_REAL_PTR]], align 8
+// OGCG: %[[A_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[A_ADDR]], i32 0, i32 1
+// OGCG: %[[A_IMAG:.*]] = load i32, ptr %[[A_IMAG_PTR]], align 4
+// OGCG: %[[B_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[B_ADDR]], i32 0, i32 0
+// OGCG: %[[B_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[B_ADDR]], i32 0, i32 1
+// OGCG: store i32 %[[A_REAL]], ptr %[[B_REAL_PTR]], align 4
+// OGCG: store i32 %[[A_IMAG]], ptr %[[B_IMAG_PTR]], align 4
|
andykaylor
reviewed
Jul 23, 2025
Comment on lines
330
to
333
| void lvalue_to_rvalue_bitcast() { | ||
| void *a; | ||
| int _Complex b = __builtin_bit_cast(int _Complex, a); | ||
| } |
Contributor
There was a problem hiding this comment.
Suggested change
| void lvalue_to_rvalue_bitcast() { | |
| void *a; | |
| int _Complex b = __builtin_bit_cast(int _Complex, a); | |
| } | |
| struct CX { | |
| double real; | |
| double imag; | |
| }; | |
| void lvalue_to_rvalue_bitcast() { | |
| CX a; | |
| double _Complex b = __builtin_bit_cast(double _Complex, b); | |
| } |
I think the test as you had it is UB, even though it will pass. I think my suggested alternative is not UB.
andykaylor
approved these changes
Jul 24, 2025
mahesh-attarde
pushed a commit
to mahesh-attarde/llvm-project
that referenced
this pull request
Jul 28, 2025
This change adds support for CK_LValueToRValueBitCast for ComplexType llvm#141365
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This change adds support for CK_LValueToRValueBitCast for ComplexType
#141365