[mlir][tosa] Add ext-mxfp support for const and cast ops (llvm#163641)

This commit allows const and cast ops with MXFP datatypes through the
validation pass when specification version 1.1.draft is selected.

Note: it doesn't include support for the mxint8 datatype. This will be
added in a separate commit.

Note: this commit adds support as defined in the spec in
arm/tosa-specification@063846a.
EXT_MXFP extension is considered experimental and subject to breaking
change.

Author: lhutton1

mlir/include/mlir/Dialect/Tosa/IR/TosaComplianceData.h.inc

@@ -855,7 +855,15 @@ extensionComplianceMap = {
        {{{fp8e5m2T, fp16T}, SpecificationVersion::V_1_0},
         {{fp8e5m2T, fp32T}, SpecificationVersion::V_1_0},
         {{fp16T, fp8e5m2T}, SpecificationVersion::V_1_0},
-        {{fp32T, fp8e5m2T}, SpecificationVersion::V_1_0}}}}},
+        {{fp32T, fp8e5m2T}, SpecificationVersion::V_1_0}}},
+      {{Extension::bf16, Extension::mxfp},
+       {{{fp4e2m1T, bf16T}, SpecificationVersion::V_1_1_DRAFT},
+        {{fp6e3m2T, bf16T}, SpecificationVersion::V_1_1_DRAFT},
+        {{fp6e2m3T, bf16T}, SpecificationVersion::V_1_1_DRAFT},
+        {{bf16T, fp4e2m1T}, SpecificationVersion::V_1_1_DRAFT},
+        {{bf16T, fp6e3m2T}, SpecificationVersion::V_1_1_DRAFT},
+        {{bf16T, fp6e2m3T}, SpecificationVersion::V_1_1_DRAFT}},
+       allOf}}},
     {"tosa.rescale",
      {{{Extension::int16},
        {{{i48T, i48T, i8T, i8T}, SpecificationVersion::V_1_0},
@@ -867,7 +875,12 @@ extensionComplianceMap = {
       {{Extension::int64}, {{{i64T}, SpecificationVersion::V_1_1_DRAFT}}},
       {{Extension::fp8e4m3}, {{{fp8e4m3T}, SpecificationVersion::V_1_0}}},
       {{Extension::fp8e5m2}, {{{fp8e5m2T}, SpecificationVersion::V_1_0}}},
-      {{Extension::bf16}, {{{bf16T}, SpecificationVersion::V_1_0}}}}},
+      {{Extension::bf16}, {{{bf16T}, SpecificationVersion::V_1_0}}},
+      {{Extension::mxfp},
+       {{{fp8ue8m0T}, SpecificationVersion::V_1_1_DRAFT},
+        {{fp6e3m2T}, SpecificationVersion::V_1_1_DRAFT},
+        {{fp6e2m3T}, SpecificationVersion::V_1_1_DRAFT},
+        {{fp4e2m1T}, SpecificationVersion::V_1_1_DRAFT}}}}},
     {"tosa.identity",
      {{{Extension::int4}, {{{i4T, i4T}, SpecificationVersion::V_1_0}}},
       {{Extension::int16}, {{{i48T, i48T}, SpecificationVersion::V_1_0}}},

mlir/include/mlir/Dialect/Tosa/IR/TosaOps.td

@@ -2462,7 +2462,7 @@ def Tosa_CastOp: Tosa_Op<"cast", [Pure, SameOperandsAndResultShape,
 
   list<Availability> availability = [
     Profile<[Tosa_PRO_INT, Tosa_PRO_FP]>,
-    Extension<[Tosa_EXT_FP8E4M3, Tosa_EXT_FP8E5M2, Tosa_EXT_BF16, Tosa_EXT_INT64]>,
+    Extension<[Tosa_EXT_FP8E4M3, Tosa_EXT_FP8E5M2, Tosa_EXT_BF16, Tosa_EXT_MXFP, Tosa_EXT_INT64]>,
   ];
 
   let assemblyFormat = "operands attr-dict `:` functional-type(operands, results)";
@@ -2578,7 +2578,7 @@ def Tosa_ConstOp : Tosa_Op<"const", [ConstantLike, Pure,
 
   list<Availability> availability = [
     Profile<[Tosa_PRO_INT, Tosa_PRO_FP]>,
-    Extension<[Tosa_EXT_INT4, Tosa_EXT_INT16, Tosa_EXT_FP8E4M3, Tosa_EXT_FP8E5M2, Tosa_EXT_BF16, Tosa_EXT_INT64]>,
+    Extension<[Tosa_EXT_INT4, Tosa_EXT_INT16, Tosa_EXT_FP8E4M3, Tosa_EXT_FP8E5M2, Tosa_EXT_BF16, Tosa_EXT_MXFP, Tosa_EXT_INT64]>,
   ];
 
   let hasFolder = 1;

mlir/test/Dialect/Tosa/availability.mlir

@@ -606,7 +606,7 @@ func.func @test_resize(%arg0: tensor<1x32x32x8xf32>) -> tensor<1x64x64x8xf32> {
 // CHECK-LABEL: cast
 func.func @test_cast1(%arg0: tensor<13x21x3xi32>) -> tensor<13x21x3xf32> {
   // CHECK: profiles: [ [pro_int, pro_fp] ]
-  // CHECK: extensions: [ [fp8e4m3, fp8e5m2, bf16, int64] ]
+  // CHECK: extensions: [ [fp8e4m3, fp8e5m2, bf16, mxfp, int64] ]
   %0 = tosa.cast %arg0 : (tensor<13x21x3xi32>) -> tensor<13x21x3xf32>
   return %0 : tensor<13x21x3xf32>
 }
@@ -626,7 +626,7 @@ func.func @test_rescale(%arg0: tensor<13x21x3x!quant.uniform<u8:f32, 0.015655439
 // CHECK-LABEL: test_const
 func.func @test_const(%arg0 : index) -> tensor<4xi32> {
   // CHECK: profiles: [ [pro_int, pro_fp] ]
-  // CHECK: extensions: [ [int4, int16, fp8e4m3, fp8e5m2, bf16, int64] ]
+  // CHECK: extensions: [ [int4, int16, fp8e4m3, fp8e5m2, bf16, mxfp, int64] ]
     %0 = "tosa.const"() {values = dense<[3, 0, 1, 2]> : tensor<4xi32>} : () -> tensor<4xi32>
     return %0 : tensor<4xi32>
 }

mlir/test/Dialect/Tosa/invalid_extension.mlir

@@ -555,3 +555,17 @@ func.func @test_argmax_int64(%arg0: tensor<1x13x13x5xf32>) -> tensor<1x13x13xi64
   %0 = tosa.argmax %arg0 {axis = 3 : i32} : (tensor<1x13x13x5xf32>) -> tensor<1x13x13xi64>
   return %0 : tensor<1x13x13xi64>
 }
+
+// -----
+func.func @test_const_fp6e3m2(%arg0 : index) -> tensor<4xf6E3M2FN> {
+  // expected-error@+1 {{'tosa.const' op illegal: requires [mxfp] but not enabled in target}}
+    %0 = "tosa.const"() {values = dense<[0.0, 0.0, 0.0, 0.0]> : tensor<4xf6E3M2FN>} : () -> tensor<4xf6E3M2FN>
+    return %0 : tensor<4xf6E3M2FN>
+}
+
+// -----
+func.func @test_cast_f4e2m1(%arg0: tensor<13x21x3xf4E2M1FN>) -> tensor<13x21x3xbf16> {
+  // expected-error@+1 {{'tosa.cast' op illegal: requires all of [bf16, mxfp] but not enabled in target}}
+  %0 = tosa.cast %arg0 : (tensor<13x21x3xf4E2M1FN>) -> tensor<13x21x3xbf16>
+  return %0 : tensor<13x21x3xbf16>
+}

mlir/test/Dialect/Tosa/tosa-validation-version-1p1-valid.mlir

@@ -42,3 +42,19 @@ func.func @test_const_i64(%arg0 : index) -> tensor<4xi64> {
     %0 = "tosa.const"() {values = dense<[3, 0, 1, 2]> : tensor<4xi64>} : () -> tensor<4xi64>
     return %0 : tensor<4xi64>
 }
+
+// -----
+
+// CHECK-LABEL: test_const_fp6e3m2
+func.func @test_const_fp6e3m2(%arg0 : index) -> tensor<4xf6E3M2FN> {
+    %0 = "tosa.const"() {values = dense<[0.0, 0.0, 0.0, 0.0]> : tensor<4xf6E3M2FN>} : () -> tensor<4xf6E3M2FN>
+    return %0 : tensor<4xf6E3M2FN>
+}
+
+// -----
+
+// CHECK-LABEL: test_cast_f4e2m1
+func.func @test_cast_f4e2m1(%arg0: tensor<13x21x3xf4E2M1FN>) -> tensor<13x21x3xbf16> {
+  %0 = tosa.cast %arg0 : (tensor<13x21x3xf4E2M1FN>) -> tensor<13x21x3xbf16>
+  return %0 : tensor<13x21x3xbf16>
+}