[clang] [OpenMP] Remove complex reduction variable support (PR #82497)

[Akash Banerjee via cfe-commits]

https://github.com/TIFitis created https://github.com/llvm/llvm-project/pull/82497

This patch removes the complex reduction variables codegen. There are currently no tests for this, and from playing around with some complex reduction variable test cases the code seems unreachable.

The PR #80343 proposes to migrate reductions codegen to the OMPIRBuilder and it isn't currently well equipped to handle complex variables. This patch would enable PR #80343 to go forward.

>From 9d3e9a44089086fd8528d79709be196123a8d493 Mon Sep 17 00:00:00 2001
From: Akash Banerjee <Akash.Banerjee at amd.com>
Date: Wed, 21 Feb 2024 15:10:43 +0000
Subject: [PATCH] [OpenMP] Remove complex reductions

This patch removes the complex reduction variables codegen. There are currently no tests for this, and from playing around with some complex reduction variable test cases the code seems unreachable.

The PR #80343 proposes to migrate reductions codegen to the OMPIRBuilder and it isn't currently well equipped to handle complex variables. This patch would enable PR #80343 to go forward.
---
 clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
index 299ee1460b3db0..a954ad0b3a5e2c 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
@@ -1653,12 +1653,7 @@ static void emitReductionListCopy(
         break;
       }
       case TEK_Complex: {
-        CodeGenFunction::ComplexPairTy Elem = CGF.EmitLoadOfComplex(
-            CGF.MakeAddrLValue(SrcElementAddr, Private->getType()),
-            Private->getExprLoc());
-        CGF.EmitStoreOfComplex(
-            Elem, CGF.MakeAddrLValue(DestElementAddr, Private->getType()),
-            /*isInit=*/false);
+        llvm_unreachable("OpenMP Complex reduction not handled.");
         break;
       }
       case TEK_Aggregate:
@@ -2232,9 +2227,7 @@ static llvm::Value *emitListToGlobalCopyFunction(
       break;
     }
     case TEK_Complex: {
-      CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex(
-          CGF.MakeAddrLValue(ElemPtr, Private->getType()), Loc);
-      CGF.EmitStoreOfComplex(V, GlobLVal, /*isInit=*/false);
+      llvm_unreachable("OpenMP Complex reduction not handled.");
       break;
     }
     case TEK_Aggregate:
@@ -2439,9 +2432,7 @@ static llvm::Value *emitGlobalToListCopyFunction(
       break;
     }
     case TEK_Complex: {
-      CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex(GlobLVal, Loc);
-      CGF.EmitStoreOfComplex(V, CGF.MakeAddrLValue(ElemPtr, Private->getType()),
-                             /*isInit=*/false);
+      llvm_unreachable("OpenMP Complex reduction not handled.");
       break;
     }
     case TEK_Aggregate: