[wasm] Enable v128 and PackedSimd in the interpreter (#85920)

Fix the create scalar intrinsics in the jiterpreter
Fix trimming removing SIMD even if SIMD was enabled
Add wasm opcode mapping for extract msb
Fix some SN_ lists in transform-simd being ordered incorrectly
Due to mixed mode it is not possible to control interp SIMD with a runtime option, so remove the options
Disable linker substitutions for SIMD unless AOT is active, so the interp is responsible for the properties
Generate a MINT_NIY for unimplemented PackedSimd methods

eng/testing/tests.wasm.targets

@@ -61,7 +61,7 @@
       So, set those parameters explicitly here.
       -->
     <_ExtraTrimmerArgs Condition="'$(WasmEnableSIMD)' == 'true' and '$(RunAOTCompilation)' == 'true'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MonoProjectRoot)\wasm\build\ILLink.Substitutions.WasmIntrinsics.xml&quot;</_ExtraTrimmerArgs>
-    <_ExtraTrimmerArgs Condition="'$(WasmEnableSIMD)' != 'true' or '$(RunAOTCompilation)' != 'true'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MonoProjectRoot)\wasm\build\ILLink.Substitutions.NoWasmIntrinsics.xml&quot;</_ExtraTrimmerArgs>
+    <_ExtraTrimmerArgs Condition="'$(WasmEnableSIMD)' != 'true'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MonoProjectRoot)\wasm\build\ILLink.Substitutions.NoWasmIntrinsics.xml&quot;</_ExtraTrimmerArgs>
   </PropertyGroup>
 
   <ItemGroup>

src/mono/mono/mini/interp/interp.c

@@ -3802,6 +3802,10 @@ mono_interp_exec_method (InterpFrame *frame, ThreadContext *context, FrameClause
 			memset (locals + ip [1], 0, ip [2]);
 			ip += 3;
 			MINT_IN_BREAK;
+		MINT_IN_CASE(MINT_NIY)
+			g_printf ("MONO interpreter: NIY encountered in method %s\n", frame->imethod->method->name);
+			g_assert_not_reached ();
+			MINT_IN_BREAK;
 		MINT_IN_CASE(MINT_BREAK)
 			++ip;
 			SAVE_INTERP_STATE (frame);

src/mono/mono/mini/interp/mintops.def

@@ -26,6 +26,7 @@
 #define IROPDEF(opsymbol, opstring, oplength, num_dregs, num_sregs, optype) OPDEF(opsymbol, opstring, oplength, num_dregs, num_sregs, optype)
 #endif // IROPDEF
 
+OPDEF(MINT_NIY, "niy", 1, 0, 0, MintOpNoArgs)
 OPDEF(MINT_BREAK, "break", 1, 0, 0, MintOpNoArgs)
 OPDEF(MINT_BREAKPOINT, "breakpoint", 1, 0, 0, MintOpNoArgs)
 
@@ -843,7 +844,6 @@ OPDEF(MINT_TIER_MONITOR_JITERPRETER, "tier_monitor_jiterpreter", 3, 0, 0, MintOp
 #endif // HOST_BROWSER
 
 IROPDEF(MINT_NOP, "nop", 1, 0, 0, MintOpNoArgs)
-IROPDEF(MINT_NIY, "niy", 1, 0, 0, MintOpNoArgs)
 IROPDEF(MINT_DEF, "def", 2, 1, 0, MintOpNoArgs)
 IROPDEF(MINT_IL_SEQ_POINT, "il_seq_point", 1, 0, 0, MintOpNoArgs)
 IROPDEF(MINT_DUMMY_USE, "dummy_use", 2, 0, 1, MintOpNoArgs)

src/mono/mono/mini/interp/transform-simd.c

@@ -67,10 +67,6 @@ static guint16 sri_vector128_methods [] = {
 };
 
 static guint16 sri_vector128_t_methods [] = {
-	SN_get_AllBitsSet,
-	SN_get_Count,
-	SN_get_One,
-	SN_get_Zero,
 	SN_op_Addition,
 	SN_op_BitwiseAnd,
 	SN_op_BitwiseOr,
@@ -84,12 +80,29 @@ static guint16 sri_vector128_t_methods [] = {
 	SN_op_RightShift,
 	SN_op_Subtraction,
 	SN_op_UnaryNegation,
-	SN_op_UnsignedRightShift
+	SN_op_UnsignedRightShift,
+	SN_get_AllBitsSet,
+	SN_get_Count,
+	SN_get_One,
+	SN_get_Zero,
 };
 
 static guint16 sri_packedsimd_methods [] = {
+	SN_Add,
+	SN_And,
+	SN_Bitmask,
+	SN_CompareEqual,
+	SN_CompareNotEqual,
 	SN_ConvertNarrowingSignedSaturate,
 	SN_ConvertNarrowingUnsignedSaturate,
+	SN_Dot,
+	SN_Multiply,
+	SN_Negate,
+	SN_ShiftLeft,
+	SN_ShiftRightArithmetic,
+	SN_ShiftRightLogical,
+	SN_Splat,
+	SN_Subtract,
 	SN_Swizzle,
 	SN_get_IsHardwareAccelerated,
 	SN_get_IsSupported,
@@ -534,12 +547,12 @@ static gboolean
 emit_sri_packedsimd (TransformData *td, MonoMethod *cmethod, MonoMethodSignature *csignature)
 {
 	int id = lookup_intrins (sri_packedsimd_methods, sizeof (sri_packedsimd_methods), cmethod);
-	if (id == -1)
-		return FALSE;
+	// We don't early-out for an unrecognized method, we will generate an NIY later
 
 	MonoClass *vector_klass = mono_class_from_mono_type_internal (csignature->ret);
 	int vector_size = -1;
 
+	// NOTE: Linker substitutions (used in AOT) will prevent this from running.
 	if ((id == SN_get_IsSupported) || (id == SN_get_IsHardwareAccelerated)) {
 #if HOST_BROWSER
 		interp_add_ins (td, MINT_LDC_I4_1);
@@ -550,6 +563,23 @@ emit_sri_packedsimd (TransformData *td, MonoMethod *cmethod, MonoMethodSignature
 	}
 
 #if HOST_BROWSER
+	if (id < 0) {
+		g_print ("MONO interpreter: Unimplemented method: System.Runtime.Intrinsics.Wasm.PackedSimd.%s\n", cmethod->name);
+
+		// If we're missing a packedsimd method but the packedsimd method was AOT'd, we can
+		//  just let the interpreter generate a native call to the AOT method instead of
+		//  generating an NIY that will halt execution
+		ERROR_DECL (error);
+		gpointer addr = mono_aot_get_method (cmethod, error);
+		if (addr)
+			return FALSE;
+
+		// The packedsimd method implementations recurse infinitely and cause a stack overflow,
+		//  so replace them with a NIY opcode instead that will assert
+		interp_add_ins (td, MINT_NIY);
+		goto opcode_added;
+	}
+
 	gint16 simd_opcode = -1;
 	gint16 simd_intrins = -1;
 	if (!m_class_is_simd_type (vector_klass))
@@ -705,21 +735,14 @@ interp_emit_simd_intrinsics (TransformData *td, MonoMethod *cmethod, MonoMethodS
 	class_ns = m_class_get_name_space (cmethod->klass);
 	class_name = m_class_get_name (cmethod->klass);
 
-	if (mono_opt_interp_simd_v128 && !strcmp (class_ns, "System.Runtime.Intrinsics")) {
+	if (!strcmp (class_ns, "System.Runtime.Intrinsics")) {
 		if (!strcmp (class_name, "Vector128"))
 			return emit_sri_vector128 (td, cmethod, csignature);
 		else if (!strcmp (class_name, "Vector128`1"))
 			return emit_sri_vector128_t (td, cmethod, csignature);
-	} else if (mono_opt_interp_simd_packedsimd && !strcmp (class_ns, "System.Runtime.Intrinsics.Wasm")) {
-		if (!strcmp (class_name, "PackedSimd")) {
-			gboolean res = emit_sri_packedsimd (td, cmethod, csignature);
-#if HOST_BROWSER
-			if (!res)
-				g_print ("MONO interpreter: Unsupported method: System.Runtime.Intrinsics.Wasm.PackedSimd.%s\n", cmethod->name);
-			g_assert (res);
-#endif
-			return res;
-		}
+	} else if (!strcmp (class_ns, "System.Runtime.Intrinsics.Wasm")) {
+		if (!strcmp (class_name, "PackedSimd"))
+			return emit_sri_packedsimd (td, cmethod, csignature);
 	}
 	return FALSE;
 }

src/mono/mono/utils/options-def.h

@@ -60,12 +60,6 @@ DEFINE_BOOL_READONLY(readonly_flag, "readonly-flag", FALSE, "Example")
 DEFINE_BOOL(wasm_exceptions, "wasm-exceptions", FALSE, "Enable codegen for WASM exceptions")
 DEFINE_BOOL(wasm_gc_safepoints, "wasm-gc-safepoints", FALSE, "Use GC safepoints on WASM")
 DEFINE_BOOL(aot_lazy_assembly_load, "aot-lazy-assembly-load", FALSE, "Load assemblies referenced by AOT images lazily")
-#if HOST_BROWSER
-DEFINE_BOOL(interp_simd_v128, "interp-simd-v128", FALSE, "Enable interpreter Vector128 support")
-#else
-DEFINE_BOOL(interp_simd_v128, "interp-simd-v128", TRUE, "Enable interpreter Vector128 support")
-#endif
-DEFINE_BOOL(interp_simd_packedsimd, "interp-simd-packedsimd", FALSE, "Enable interpreter WASM PackedSimd support")
 
 #if HOST_BROWSER
 

src/mono/wasm/build/WasmApp.targets

@@ -124,7 +124,7 @@
     <UseAppHost>false</UseAppHost>
     <TrimMode Condition="'$(TrimMode)' == ''">full</TrimMode>
     <_ExtraTrimmerArgs Condition="'$(WasmEnableSIMD)' == 'true' and '$(RunAOTCompilation)' == 'true'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MSBuildThisFileDirectory)ILLink.Substitutions.WasmIntrinsics.xml&quot;</_ExtraTrimmerArgs>
-    <_ExtraTrimmerArgs Condition="'$(WasmEnableSIMD)' != 'true' or '$(RunAOTCompilation)' != 'true'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MSBuildThisFileDirectory)ILLink.Substitutions.NoWasmIntrinsics.xml&quot;</_ExtraTrimmerArgs>
+    <_ExtraTrimmerArgs Condition="'$(WasmEnableSIMD)' != 'true'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MSBuildThisFileDirectory)ILLink.Substitutions.NoWasmIntrinsics.xml&quot;</_ExtraTrimmerArgs>
     <_ExtraTrimmerArgs Condition="'$(WasmEnableLegacyJsInterop)' == 'false'">$(_ExtraTrimmerArgs) --substitutions &quot;$(MSBuildThisFileDirectory)ILLink.Substitutions.LegacyJsInterop.xml&quot;</_ExtraTrimmerArgs>
 
     <!-- Temporarily `false`, till sdk gets a fix for supporting the new file -->

src/mono/wasm/runtime/jiterpreter-tables.ts

@@ -1,8 +1,8 @@
 import {
-    WasmOpcode, JiterpSpecialOpcode
+    WasmOpcode, WasmSimdOpcode, JiterpSpecialOpcode
 } from "./jiterpreter-opcodes";
 import {
-    MintOpcode, SimdIntrinsic3
+    MintOpcode, SimdIntrinsic2, SimdIntrinsic3
 } from "./mintops";
 
 export const ldcTable: { [opcode: number]: [WasmOpcode, number] } = {
@@ -356,3 +356,17 @@ export const simdShiftTable = new Set<SimdIntrinsic3>([
     SimdIntrinsic3.V128_I4_URIGHT_SHIFT,
     SimdIntrinsic3.V128_I8_URIGHT_SHIFT,
 ]);
+
+export const bitmaskTable : { [intrinsic: number]: WasmSimdOpcode } = {
+    [SimdIntrinsic2.V128_I1_EXTRACT_MSB]: WasmSimdOpcode.i8x16_bitmask,
+    [SimdIntrinsic2.V128_I2_EXTRACT_MSB]: WasmSimdOpcode.i16x8_bitmask,
+    [SimdIntrinsic2.V128_I4_EXTRACT_MSB]: WasmSimdOpcode.i32x4_bitmask,
+    [SimdIntrinsic2.V128_I8_EXTRACT_MSB]: WasmSimdOpcode.i64x2_bitmask,
+};
+
+export const createScalarTable : { [intrinsic: number]: [WasmOpcode, WasmSimdOpcode] } = {
+    [SimdIntrinsic2.V128_I1_CREATE_SCALAR]: [WasmOpcode.i32_load8_s, WasmSimdOpcode.i8x16_replace_lane],
+    [SimdIntrinsic2.V128_I2_CREATE_SCALAR]: [WasmOpcode.i32_load16_s, WasmSimdOpcode.i16x8_replace_lane],
+    [SimdIntrinsic2.V128_I4_CREATE_SCALAR]: [WasmOpcode.i32_load, WasmSimdOpcode.i32x4_replace_lane],
+    [SimdIntrinsic2.V128_I8_CREATE_SCALAR]: [WasmOpcode.i64_load, WasmSimdOpcode.i64x2_replace_lane],
+};

src/mono/wasm/runtime/jiterpreter-trace-generator.ts

@@ -48,6 +48,7 @@ import {
     relopbranchTable, mathIntrinsicTable,
     simdCreateLoadOps, simdCreateSizes,
     simdCreateStoreOps, simdShiftTable,
+    bitmaskTable, createScalarTable,
 } from "./jiterpreter-tables";
 import { mono_log_error, mono_log_info } from "./logging";
 
@@ -3156,13 +3157,6 @@ function append_simd_4_load(builder: WasmBuilder, ip: MintOpcodePtr) {
     append_ldloc(builder, getArgU16(ip, 4), WasmOpcode.PREFIX_simd, WasmSimdOpcode.v128_load);
 }
 
-function append_stloc_simd_zero(builder: WasmBuilder, offset: number) {
-    builder.local("pLocals");
-    builder.appendSimd(WasmSimdOpcode.v128_const);
-    builder.appendBytes(new Uint8Array(sizeOfV128));
-    append_stloc_tail(builder, offset, WasmOpcode.PREFIX_simd, WasmSimdOpcode.v128_store);
-}
-
 function emit_simd_2(builder: WasmBuilder, ip: MintOpcodePtr, index: SimdIntrinsic2): boolean {
     const simple = <WasmSimdOpcode>cwraps.mono_jiterp_get_simd_opcode(1, index);
     if (simple) {
@@ -3172,35 +3166,33 @@ function emit_simd_2(builder: WasmBuilder, ip: MintOpcodePtr, index: SimdIntrins
         return true;
     }
 
+    const bitmask = bitmaskTable[index];
+    if (bitmask) {
+        append_simd_2_load(builder, ip);
+        builder.appendSimd(bitmask);
+        append_stloc_tail(builder, getArgU16(ip, 1), WasmOpcode.i32_store);
+        return true;
+    }
+
     switch (index) {
         case SimdIntrinsic2.V128_I1_CREATE_SCALAR:
-            // Zero then write scalar component
-            builder.local("pLocals");
-            append_stloc_simd_zero(builder, getArgU16(ip, 1));
-            append_ldloc(builder, getArgU16(ip, 2), WasmOpcode.i32_load8_s);
-            append_stloc_tail(builder, getArgU16(ip, 1), WasmOpcode.i32_store8);
-            return true;
         case SimdIntrinsic2.V128_I2_CREATE_SCALAR:
-            // Zero then write scalar component
-            builder.local("pLocals");
-            append_stloc_simd_zero(builder, getArgU16(ip, 1));
-            append_ldloc(builder, getArgU16(ip, 2), WasmOpcode.i32_load16_s);
-            append_stloc_tail(builder, getArgU16(ip, 1), WasmOpcode.i32_store16);
-            return true;
         case SimdIntrinsic2.V128_I4_CREATE_SCALAR:
-            // Zero then write scalar component
+        case SimdIntrinsic2.V128_I8_CREATE_SCALAR: {
+            const tableEntry = createScalarTable[index];
             builder.local("pLocals");
-            append_stloc_simd_zero(builder, getArgU16(ip, 1));
-            append_ldloc(builder, getArgU16(ip, 2), WasmOpcode.i32_load);
-            append_stloc_tail(builder, getArgU16(ip, 1), WasmOpcode.i32_store);
-            return true;
-        case SimdIntrinsic2.V128_I8_CREATE_SCALAR:
-            // Zero then write scalar component
-            builder.local("pLocals");
-            append_stloc_simd_zero(builder, getArgU16(ip, 1));
-            append_ldloc(builder, getArgU16(ip, 2), WasmOpcode.i64_load);
-            append_stloc_tail(builder, getArgU16(ip, 1), WasmOpcode.i64_store);
+            // Make a zero vector
+            builder.i52_const(0);
+            builder.appendSimd(WasmSimdOpcode.i64x2_splat);
+            // Load the scalar value
+            append_ldloc(builder, getArgU16(ip, 2), tableEntry[0]);
+            // Replace the first lane
+            builder.appendSimd(tableEntry[1]);
+            builder.appendU8(0);
+            // Store result
+            append_stloc_tail(builder, getArgU16(ip, 1), WasmOpcode.PREFIX_simd, WasmSimdOpcode.v128_store);
             return true;
+        }
 
         case SimdIntrinsic2.V128_I1_CREATE:
             append_simd_2_load(builder, ip, WasmSimdOpcode.v128_load8_splat);