[clang] [CIR] Upstream Load/Store Complex with volatile qualifier (PR #167216)

[Amr Hesham via cfe-commits]

https://github.com/AmrDeveloper created https://github.com/llvm/llvm-project/pull/167216

Upstream supporting Load/Store ops for Complex with volatile qualifier

>From 5a02c9d9a17d59f08aed33dd52d55c664296ec91 Mon Sep 17 00:00:00 2001
From: Amr Hesham <amr96 at programmer.net>
Date: Sun, 9 Nov 2025 12:50:56 +0100
Subject: [PATCH] [CIR] Upstream Load/Store Complex with volatile qualifier

---
 clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp |  4 +-
 clang/test/CIR/CodeGen/complex.cpp          | 49 +++++++++++++++++++++
 2 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
index 047f3599eed03..9ed920085c8c6 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
@@ -339,7 +339,7 @@ mlir::Value ComplexExprEmitter::emitLoadOfLValue(LValue lv,
     cgf.cgm.errorNYI(loc, "emitLoadOfLValue with Atomic LV");
 
   const Address srcAddr = lv.getAddress();
-  return builder.createLoad(cgf.getLoc(loc), srcAddr);
+  return builder.createLoad(cgf.getLoc(loc), srcAddr, lv.isVolatileQualified());
 }
 
 /// EmitStoreOfComplex - Store the specified real/imag parts into the
@@ -353,7 +353,7 @@ void ComplexExprEmitter::emitStoreOfComplex(mlir::Location loc, mlir::Value val,
   }
 
   const Address destAddr = lv.getAddress();
-  builder.createStore(loc, val, destAddr);
+  builder.createStore(loc, val, destAddr, lv.isVolatileQualified());
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/clang/test/CIR/CodeGen/complex.cpp b/clang/test/CIR/CodeGen/complex.cpp
index 3fb78dc871904..fa60b4590035e 100644
--- a/clang/test/CIR/CodeGen/complex.cpp
+++ b/clang/test/CIR/CodeGen/complex.cpp
@@ -1495,3 +1495,52 @@ void calling_function_that_return_complex() {
 // OGCG: %[[A_IMAG_PTR:.*]] = getelementptr inbounds nuw { float, float }, ptr %[[A_ADDR]], i32 0, i32 1
 // OGCG: store float %[[RESULT_REAL]], ptr %[[A_REAL_PTR]], align 4
 // OGCG: store float %[[RESULT_IMAG]], ptr %[[A_IMAG_PTR]], align 4
+
+void load_store_volatile() {
+  volatile double _Complex a;
+  volatile double _Complex b;
+  a = b;
+
+  volatile int _Complex c;
+  volatile int _Complex d;
+  c = d;
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !cir.complex<!cir.double>, !cir.ptr<!cir.complex<!cir.double>>, ["a"]
+// CIR: %[[B_ADDR:.*]] = cir.alloca !cir.complex<!cir.double>, !cir.ptr<!cir.complex<!cir.double>>, ["b"]
+// CIR: %[[C_ADDR:.*]] = cir.alloca !cir.complex<!s32i>, !cir.ptr<!cir.complex<!s32i>>, ["c"]
+// CIR: %[[D_ADDR:.*]] = cir.alloca !cir.complex<!s32i>, !cir.ptr<!cir.complex<!s32i>>, ["d"]
+// CIR: %[[TMP_B:.*]] = cir.load volatile {{.*}} %[[B_ADDR]] : !cir.ptr<!cir.complex<!cir.double>>, !cir.complex<!cir.double>
+// CIR: cir.store volatile {{.*}} %[[TMP_B]], %[[A_ADDR]] : !cir.complex<!cir.double>, !cir.ptr<!cir.complex<!cir.double>>
+// CIR: %[[TMP_D:.*]] = cir.load volatile {{.*}} %[[D_ADDR]] : !cir.ptr<!cir.complex<!s32i>>, !cir.complex<!s32i>
+// CIR: cir.store volatile {{.*}} %[[TMP_D]], %[[C_ADDR]] : !cir.complex<!s32i>, !cir.ptr<!cir.complex<!s32i>>
+
+// LLVM: %[[A_ADDR:.*]] = alloca { double, double }, i64 1, align 8
+// LLVM: %[[B_ADDR:.*]] = alloca { double, double }, i64 1, align 8
+// LLVM: %[[C_ADDR:.*]] = alloca { i32, i32 }, i64 1, align 4
+// LLVM: %[[D_ADDR:.*]] = alloca { i32, i32 }, i64 1, align 4
+// LLVM: %[[TMP_B:.*]] = load volatile { double, double }, ptr %[[B_ADDR]], align 8
+// LLVM: store volatile { double, double } %[[TMP_B]], ptr %[[A_ADDR]], align 8
+// LLVM: %[[TMP_D:.*]] = load volatile { i32, i32 }, ptr %[[D_ADDR]], align 4
+// LLVM: store volatile { i32, i32 } %[[TMP_D]], ptr %[[C_ADDR]], align 4
+
+// OGCG: %[[A_ADDR:.*]] = alloca { double, double }, align 8
+// OGCG: %[[B_ADDR:.*]] = alloca { double, double }, align 8
+// OGCG: %[[C_ADDR:.*]] = alloca { i32, i32 }, align 4
+// OGCG: %[[D_ADDR:.*]] = alloca { i32, i32 }, align 4
+// OGCG: %[[B_REAL_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[B_ADDR]], i32 0, i32 0
+// OGCG: %[[B_REAL:.*]] = load volatile double, ptr %[[B_REAL_PTR]], align 8
+// OGCG: %[[B_IMAG_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[B_ADDR]], i32 0, i32 1
+// OGCG: %[[B_IMAG:.*]] = load volatile double, ptr %[[B_IMAG_PTR]], align 8
+// OGCG: %[[A_REAL_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[A_ADDR]], i32 0, i32 0
+// OGCG: %[[A_IMAG_PTR:.*]] = getelementptr inbounds nuw { double, double }, ptr %[[A_ADDR]], i32 0, i32 1
+// OGCG: store volatile double %[[B_REAL]], ptr %[[A_REAL_PTR]], align 8
+// OGCG: store volatile double %[[B_IMAG]], ptr %[[A_IMAG_PTR]], align 8
+// OGCG: %[[D_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[D_ADDR]], i32 0, i32 0
+// OGCG: %[[D_REAL:.*]] = load volatile i32, ptr %[[D_REAL_PTR]], align 4
+// OGCG: %[[D_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[D_ADDR]], i32 0, i32 1
+// OGCG: %[[D_IMAG:.*]] = load volatile i32, ptr %[[D_IMAG_PTR]], align 4
+// OGCG: %[[C_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[C_ADDR]], i32 0, i32 0
+// OGCG: %[[C_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr %[[C_ADDR]], i32 0, i32 1
+// OGCG: store volatile i32 %[[D_REAL]], ptr %[[C_REAL_PTR]], align 4
+// OGCG: store volatile i32 %[[D_IMAG]], ptr %[[C_IMAG_PTR]], align 4