[Mlir-commits] [mlir] [mlir] [arith] add shl overflow flag in Arith and lower to SPIR-V and LLVMIR (PR #79828)

[llvmlistbot at llvm.org]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-mlir-arith

Author: Yi Wu (yi-wu-arm)

<details>
<summary>Changes</summary>

There is no `SHL` used in canonicalization in `arith`

---
Full diff: https://github.com/llvm/llvm-project/pull/79828.diff


6 Files Affected:

- (modified) mlir/include/mlir/Dialect/Arith/IR/ArithOps.td (+7-1) 
- (modified) mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp (+3-1) 
- (modified) mlir/lib/Conversion/ArithToSPIRV/ArithToSPIRV.cpp (+1-1) 
- (modified) mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir (+2) 
- (modified) mlir/test/Conversion/ArithToSPIRV/arith-to-spirv.mlir (+4) 
- (modified) mlir/test/Dialect/Arith/ops.mlir (+2) 


``````````diff
diff --git a/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td b/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td
index cd0102f91ef1523..4b815a2208f6c3d 100644
--- a/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td
+++ b/mlir/include/mlir/Dialect/Arith/IR/ArithOps.td
@@ -782,7 +782,7 @@ def Arith_XOrIOp : Arith_TotalIntBinaryOp<"xori", [Commutative]> {
 // ShLIOp
 //===----------------------------------------------------------------------===//
 
-def Arith_ShLIOp : Arith_TotalIntBinaryOp<"shli"> {
+def Arith_ShLIOp : Arith_IntBinaryOpWithOverflowFlags<"shli"> {
   let summary = "integer left-shift";
   let description = [{
     The `shli` operation shifts the integer value of the first operand to the left 
@@ -791,11 +791,17 @@ def Arith_ShLIOp : Arith_TotalIntBinaryOp<"shli"> {
     operand is greater than the bitwidth of the first operand, then the 
     operation returns poison.
 
+    This op supports `nuw`/`nsw` overflow flags which stands stand for
+    "No Unsigned Wrap" and "No Signed Wrap", respectively. If the `nuw` and/or
+    `nsw` flags are present, and an unsigned/signed overflow occurs
+    (respectively), the result is poison.
+
     Example:
 
     ```mlir
     %1 = arith.constant 5 : i8                 // %1 is 0b00000101
     %2 = arith.constant 3 : i8
+    %a = arith.shli %1, %2 overflow<nsw, nuw> : (i8, i8) -> i8  
     %3 = arith.shli %1, %2 : (i8, i8) -> i8    // %3 is 0b00101000
     ```
   }];
diff --git a/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp b/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
index cf46e0d3ac46ac3..1f01f4a75c5b3ef 100644
--- a/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
+++ b/mlir/lib/Conversion/ArithToLLVM/ArithToLLVM.cpp
@@ -96,7 +96,9 @@ using RemUIOpLowering =
     VectorConvertToLLVMPattern<arith::RemUIOp, LLVM::URemOp>;
 using SelectOpLowering =
     VectorConvertToLLVMPattern<arith::SelectOp, LLVM::SelectOp>;
-using ShLIOpLowering = VectorConvertToLLVMPattern<arith::ShLIOp, LLVM::ShlOp>;
+using ShLIOpLowering =
+    VectorConvertToLLVMPattern<arith::ShLIOp, LLVM::ShlOp,
+                               arith::AttrConvertOverflowToLLVM>;
 using ShRSIOpLowering =
     VectorConvertToLLVMPattern<arith::ShRSIOp, LLVM::AShrOp>;
 using ShRUIOpLowering =
diff --git a/mlir/lib/Conversion/ArithToSPIRV/ArithToSPIRV.cpp b/mlir/lib/Conversion/ArithToSPIRV/ArithToSPIRV.cpp
index 1abad1e9fa4d85c..edf81bd7a8f3963 100644
--- a/mlir/lib/Conversion/ArithToSPIRV/ArithToSPIRV.cpp
+++ b/mlir/lib/Conversion/ArithToSPIRV/ArithToSPIRV.cpp
@@ -1217,7 +1217,7 @@ void mlir::arith::populateArithToSPIRVPatterns(
     BitwiseOpPattern<arith::AndIOp, spirv::LogicalAndOp, spirv::BitwiseAndOp>,
     BitwiseOpPattern<arith::OrIOp, spirv::LogicalOrOp, spirv::BitwiseOrOp>,
     XOrIOpLogicalPattern, XOrIOpBooleanPattern,
-    spirv::ElementwiseOpPattern<arith::ShLIOp, spirv::ShiftLeftLogicalOp>,
+    ElementwiseArithOpPattern<arith::ShLIOp, spirv::ShiftLeftLogicalOp>,
     spirv::ElementwiseOpPattern<arith::ShRUIOp, spirv::ShiftRightLogicalOp>,
     spirv::ElementwiseOpPattern<arith::ShRSIOp, spirv::ShiftRightArithmeticOp>,
     spirv::ElementwiseOpPattern<arith::NegFOp, spirv::FNegateOp>,
diff --git a/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir b/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
index 8937b24e0d174d1..29268eef47e8534 100644
--- a/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
+++ b/mlir/test/Conversion/ArithToLLVM/arith-to-llvm.mlir
@@ -586,5 +586,7 @@ func.func @ops_supporting_overflow(%arg0: i64, %arg1: i64) {
   %1 = arith.subi %arg0, %arg1 overflow<nuw> : i64
   // CHECK: %{{.*}} = llvm.mul %{{.*}}, %{{.*}} overflow<nsw, nuw> : i64
   %2 = arith.muli %arg0, %arg1 overflow<nsw, nuw> : i64
+  // CHECK: %{{.*}} = llvm.shl %{{.*}}, %{{.*}} overflow<nsw, nuw> : i64
+  %3 = arith.shli %arg0, %arg1 overflow<nsw, nuw> : i64
   return
 }
diff --git a/mlir/test/Conversion/ArithToSPIRV/arith-to-spirv.mlir b/mlir/test/Conversion/ArithToSPIRV/arith-to-spirv.mlir
index 8bf90ed0aec8ee1..ae47ae36ca51cd6 100644
--- a/mlir/test/Conversion/ArithToSPIRV/arith-to-spirv.mlir
+++ b/mlir/test/Conversion/ArithToSPIRV/arith-to-spirv.mlir
@@ -1422,6 +1422,8 @@ func.func @ops_flags(%arg0: i64, %arg1: i64) {
   %1 = arith.subi %arg0, %arg1 overflow<nuw> : i64
   // CHECK: %{{.*}} = spirv.IMul %{{.*}}, %{{.*}} {no_signed_wrap, no_unsigned_wrap} : i64
   %2 = arith.muli %arg0, %arg1 overflow<nsw, nuw> : i64
+  // CHECK: %{{.*}} = spirv.ShiftLeftLogical %{{.*}}, %{{.*}} {no_signed_wrap, no_unsigned_wrap} : i64
+  %3 = arith.shli %arg0, %arg1 overflow<nsw, nuw> : i64
   return
 }
 
@@ -1443,6 +1445,8 @@ func.func @ops_flags(%arg0: i64, %arg1: i64) {
   %1 = arith.subi %arg0, %arg1 overflow<nuw> : i64
   // CHECK: %{{.*}} = spirv.IMul %{{.*}}, %{{.*}} : i64
   %2 = arith.muli %arg0, %arg1 overflow<nsw, nuw> : i64
+  // CHECK: %{{.*}} = spirv.IMul %{{.*}}, %{{.*}} : i64
+  %3 = arith.muli %arg0, %arg1 overflow<nsw, nuw> : i64
   return
 }
 
diff --git a/mlir/test/Dialect/Arith/ops.mlir b/mlir/test/Dialect/Arith/ops.mlir
index 8ae3273f32c6b02..e499573e324b5fc 100644
--- a/mlir/test/Dialect/Arith/ops.mlir
+++ b/mlir/test/Dialect/Arith/ops.mlir
@@ -1147,5 +1147,7 @@ func.func @intflags_func(%arg0: i64, %arg1: i64) {
   %1 = arith.subi %arg0, %arg1 overflow<nuw> : i64
   // CHECK: %{{.*}} = arith.muli %{{.*}}, %{{.*}} overflow<nsw, nuw> : i64
   %2 = arith.muli %arg0, %arg1 overflow<nsw, nuw> : i64
+  // CHECK: %{{.*}} = arith.shli %{{.*}}, %{{.*}} overflow<nsw, nuw> : i64
+  %3 = arith.shli %arg0, %arg1 overflow<nsw, nuw> : i64
   return
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/79828