[llvm-branch-commits] [mlir] 82f5ee3 - Adds argument attributes for using LLVM's sret and byval attributes to

[Eric Schweitz via llvm-branch-commits]

Author: Eric Schweitz
Date: 2021-01-07T09:03:16-08:00
New Revision: 82f5ee3c3e601daad546c320a98d9e7860d6347d

URL: https://github.com/llvm/llvm-project/commit/82f5ee3c3e601daad546c320a98d9e7860d6347d
DIFF: https://github.com/llvm/llvm-project/commit/82f5ee3c3e601daad546c320a98d9e7860d6347d.diff

LOG: Adds argument attributes for using LLVM's sret and byval attributes to
the conversion of LLVM IR dialect. These attributes are used in FIR to
support the lowering of Fortran using target-specific calling
conventions.

Add roundtrip tests. Add changes per review comments/concerns.

Reviewed By: ftynse

Differential Revision: https://reviews.llvm.org/D94052

Added: 
    

Modified: 
    mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
    mlir/test/Dialect/LLVMIR/func.mlir
    mlir/test/Target/llvmir-invalid.mlir

Removed: 
    


################################################################################
diff  --git a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
index 7700867bb461..86f4e7e3e2c4 100644
--- a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
@@ -1102,6 +1102,22 @@ LogicalResult ModuleTranslation::convertOneFunction(LLVMFuncOp func) {
           llvm::AttrBuilder().addAlignmentAttr(llvm::Align(attr.getInt())));
     }
 
+    if (auto attr = func.getArgAttrOfType<UnitAttr>(argIdx, "llvm.sret")) {
+      auto argTy = mlirArg.getType().dyn_cast<LLVM::LLVMType>();
+      if (!argTy.isa<LLVM::LLVMPointerType>())
+        return func.emitError(
+            "llvm.sret attribute attached to LLVM non-pointer argument");
+      llvmArg.addAttr(llvm::Attribute::AttrKind::StructRet);
+    }
+
+    if (auto attr = func.getArgAttrOfType<UnitAttr>(argIdx, "llvm.byval")) {
+      auto argTy = mlirArg.getType().dyn_cast<LLVM::LLVMType>();
+      if (!argTy.isa<LLVM::LLVMPointerType>())
+        return func.emitError(
+            "llvm.byval attribute attached to LLVM non-pointer argument");
+      llvmArg.addAttr(llvm::Attribute::AttrKind::ByVal);
+    }
+
     valueMapping[mlirArg] = &llvmArg;
     argIdx++;
   }

diff  --git a/mlir/test/Dialect/LLVMIR/func.mlir b/mlir/test/Dialect/LLVMIR/func.mlir
index 65dc33cc1c4f..2cec1bca1f74 100644
--- a/mlir/test/Dialect/LLVMIR/func.mlir
+++ b/mlir/test/Dialect/LLVMIR/func.mlir
@@ -87,6 +87,16 @@ module {
     llvm.return
   }
 
+  // CHECK: llvm.func @byvalattr(%{{.*}}: !llvm.ptr<i32> {llvm.byval})
+  llvm.func @byvalattr(%arg0: !llvm.ptr<i32> {llvm.byval}) {
+    llvm.return
+  }
+
+  // CHECK: llvm.func @sretattr(%{{.*}}: !llvm.ptr<i32> {llvm.sret})
+  llvm.func @sretattr(%arg0: !llvm.ptr<i32> {llvm.sret}) {
+    llvm.return
+  }
+
   // CHECK: llvm.func @variadic(...)
   llvm.func @variadic(...)
 

diff  --git a/mlir/test/Target/llvmir-invalid.mlir b/mlir/test/Target/llvmir-invalid.mlir
index 14117594e2f8..fcd98ef4b143 100644
--- a/mlir/test/Target/llvmir-invalid.mlir
+++ b/mlir/test/Target/llvmir-invalid.mlir
@@ -14,6 +14,19 @@ llvm.func @invalid_noalias(%arg0 : !llvm.float {llvm.noalias = true}) -> !llvm.f
 
 // -----
 
+// expected-error @+1 {{llvm.sret attribute attached to LLVM non-pointer argument}}
+llvm.func @invalid_noalias(%arg0 : !llvm.float {llvm.sret}) -> !llvm.float {
+  llvm.return %arg0 : !llvm.float
+}
+// -----
+
+// expected-error @+1 {{llvm.byval attribute attached to LLVM non-pointer argument}}
+llvm.func @invalid_noalias(%arg0 : !llvm.float {llvm.byval}) -> !llvm.float {
+  llvm.return %arg0 : !llvm.float
+}
+
+// -----
+
 // expected-error @+1 {{llvm.align attribute attached to LLVM non-pointer argument}}
 llvm.func @invalid_align(%arg0 : !llvm.float {llvm.align = 4}) -> !llvm.float {
   llvm.return %arg0 : !llvm.float