[mlir][SPIR-V] Convert math.fpowi to spirv.CL.pown

[aobolensk]

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@llvm/pr-subscribers-mlir

Author: Arseniy Obolenskiy (aobolensk)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/196701.diff

2 Files Affected:

• (modified) mlir/lib/Conversion/MathToSPIRV/MathToSPIRV.cpp (+21)
• (modified) mlir/test/Conversion/MathToSPIRV/math-to-opencl-spirv.mlir (+14)

diff --git a/mlir/lib/Conversion/MathToSPIRV/MathToSPIRV.cpp b/mlir/lib/Conversion/MathToSPIRV/MathToSPIRV.cpp
index ea6be76373573..d517065715e2c 100644
--- a/mlir/lib/Conversion/MathToSPIRV/MathToSPIRV.cpp
+++ b/mlir/lib/Conversion/MathToSPIRV/MathToSPIRV.cpp
@@ -445,6 +445,26 @@ struct PowFOpPattern final : public OpConversionPattern<math::PowFOp> {
   }
 };
 
+/// Converts math.fpowi to spirv.CL.pown.
+struct PowIOpPattern final : public OpConversionPattern<math::FPowIOp> {
+  using Base::Base;
+
+  LogicalResult
+  matchAndRewrite(math::FPowIOp op, OpAdaptor adaptor,
+                  ConversionPatternRewriter &rewriter) const override {
+    if (LogicalResult res = checkSourceOpTypes(rewriter, op); failed(res))
+      return res;
+
+    Type dstType = getTypeConverter()->convertType(op.getType());
+    if (!dstType)
+      return failure();
+
+    rewriter.replaceOpWithNewOp<spirv::CLPownOp>(
+        op, dstType, adaptor.getLhs(), adaptor.getRhs());
+    return success();
+  }
+};
+
 /// Converts math.round to GLSL SPIRV extended ops.
 struct RoundOpPattern final : public OpConversionPattern<math::RoundOp> {
   using Base::Base;
@@ -557,6 +577,7 @@ void populateMathToSPIRVPatterns(const SPIRVTypeConverter &typeConverter,
       CheckedElementwiseOpPattern<math::FmaOp, spirv::CLFmaOp>,
       CheckedElementwiseOpPattern<math::LogOp, spirv::CLLogOp>,
       CheckedElementwiseOpPattern<math::PowFOp, spirv::CLPowOp>,
+      PowIOpPattern,
       CheckedElementwiseOpPattern<math::RoundEvenOp, spirv::CLRintOp>,
       CheckedElementwiseOpPattern<math::RoundOp, spirv::CLRoundOp>,
       CheckedElementwiseOpPattern<math::RsqrtOp, spirv::CLRsqrtOp>,
diff --git a/mlir/test/Conversion/MathToSPIRV/math-to-opencl-spirv.mlir b/mlir/test/Conversion/MathToSPIRV/math-to-opencl-spirv.mlir
index dae1b43402718..037f69e63a2dc 100644
--- a/mlir/test/Conversion/MathToSPIRV/math-to-opencl-spirv.mlir
+++ b/mlir/test/Conversion/MathToSPIRV/math-to-opencl-spirv.mlir
@@ -140,6 +140,20 @@ func.func @float32_binary_vector(%lhs: vector<4xf32>, %rhs: vector<4xf32>) {
   return
 }
 
+// CHECK-LABEL: @fpowi_scalar
+func.func @fpowi_scalar(%base: f32, %power: i32) -> f32 {
+  // CHECK: spirv.CL.pown %{{.*}}, %{{.*}} : f32, i32 -> f32
+  %0 = math.fpowi %base, %power : f32, i32
+  return %0 : f32
+}
+
+// CHECK-LABEL: @fpowi_vector
+func.func @fpowi_vector(%base: vector<4xf32>, %power: vector<4xi32>) -> vector<4xf32> {
+  // CHECK: spirv.CL.pown %{{.*}}, %{{.*}} : vector<4xf32>, vector<4xi32> -> vector<4xf32>
+  %0 = math.fpowi %base, %power : vector<4xf32>, vector<4xi32>
+  return %0 : vector<4xf32>
+}
+
 // CHECK-LABEL: @float32_ternary_scalar
 func.func @float32_ternary_scalar(%a: f32, %b: f32, %c: f32) {
   // CHECK: spirv.CL.fma %{{.*}}: f32

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