Reland "[wasm] Improve test coverage of s128 exception handling."

This is a reland of 837556be

Original change's description:
> [wasm] Improve test coverage of s128 exception handling.
>
> This adds test coverage for the encoding and decoding of s128 values as
> part of an exception package. The encoding within an exception package
> is not specified (and not observable), but the full bit-pattern needs to
> survive an encoding/decoding round trip.
>
> R=clemensb@chromium.org
> TEST=mjsunit/wasm/exceptions-simd
> BUG=v8:8091
>
> Change-Id: I4cf6c1f00c64757512f66d068640a7e772eb0127
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1905769
> Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64932}

Bug: v8:8091,v8:9973
Change-Id: I7daf17a0cbc6904e7130ec4e50b12a829b1b1d34
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1916203
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64951}

src/runtime/runtime-test.cc

@@ -1392,6 +1392,15 @@ RUNTIME_FUNCTION(Runtime_IsLiftoffFunction) {
   return isolate->heap()->ToBoolean(code && code->is_liftoff());
 }
 
+// TODO(9973): Replace this runtime function with a true feature testing
+// function in "wasm-module-builder.js" that can be used by "mjsunit" to
+// determine whether Simd128 is supported on the running architecture.
+RUNTIME_FUNCTION(Runtime_WasmSupportsSimd128) {
+  SealHandleScope shs(isolate);
+  DCHECK_EQ(0, args.length());
+  return isolate->heap()->ToBoolean(CpuFeatures::SupportsWasmSimd128());
+}
+
 RUNTIME_FUNCTION(Runtime_CompleteInobjectSlackTracking) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());

src/runtime/runtime.h

@@ -533,6 +533,7 @@ namespace internal {
   F(WasmGetNumberOfInstances, 1, 1)           \
   F(WasmNumInterpretedCalls, 1, 1)            \
   F(WasmNumCodeSpaces, 1, 1)                  \
+  F(WasmSupportsSimd128, 0, 1)                \
   F(WasmTierUpFunction, 2, 1)                 \
   F(WasmTraceMemory, 1, 1)                    \
   I(DeoptimizeNow, 0, 1)

test/mjsunit/wasm/exceptions-simd.js

@@ -8,6 +8,7 @@ load("test/mjsunit/wasm/wasm-module-builder.js");
 load("test/mjsunit/wasm/exceptions-utils.js");
 
 (function TestThrowS128Default() {
+  print(arguments.callee.name);
   var builder = new WasmModuleBuilder();
   var kSig_v_s = makeSig([kWasmS128], []);
   var except = builder.addException(kSig_v_s);
@@ -25,6 +26,8 @@ load("test/mjsunit/wasm/exceptions-utils.js");
 })();
 
 (function TestThrowCatchS128Default() {
+  if (!%WasmSupportsSimd128()) return;
+  print(arguments.callee.name);
   var builder = new WasmModuleBuilder();
   var kSig_v_s = makeSig([kWasmS128], []);
   var except = builder.addException(kSig_v_s);
@@ -38,13 +41,46 @@ load("test/mjsunit/wasm/exceptions-utils.js");
           kExprBrOnExn, 0, except,
           kExprRethrow,
         kExprEnd,
-        // TODO(mstarzinger): Actually return some compressed form of the s128
-        // value here to make sure it is extracted properly from the exception.
-        kExprDrop,
-        kExprI32Const, 1,
+        kExprLocalGet, 0,
+        kSimdPrefix, kExprI32x4Eq,
+        kSimdPrefix, kExprS1x4AllTrue,
       ])
       .exportFunc();
   var instance = builder.instantiate();
 
   assertEquals(1, instance.exports.throw_catch_simd());
 })();
+
+(function TestThrowCatchS128WithValue() {
+  if (!%WasmSupportsSimd128()) return;
+  print(arguments.callee.name);
+  var builder = new WasmModuleBuilder();
+  var kSig_v_s = makeSig([kWasmS128], []);
+  var except = builder.addException(kSig_v_s);
+  const in_idx = 0x10;   // Input index in memory.
+  const out_idx = 0x20;  // Output index in memory.
+  builder.addImportedMemory("env", "memory");
+  builder.addFunction("throw_catch_simd", kSig_v_v)
+      .addBody([
+        kExprI32Const, out_idx,
+        kExprTry, kWasmS128,
+          kExprI32Const, in_idx,
+          kSimdPrefix, kExprS128LoadMem, 0, 0,
+          kExprThrow, 0,
+        kExprCatch,
+          kExprBrOnExn, 0, except,
+          kExprRethrow,
+        kExprEnd,
+        kSimdPrefix, kExprS128StoreMem, 0, 0,
+      ])
+      .exportFunc();
+  var memory = new WebAssembly.Memory({initial: 1});
+  var instance = builder.instantiate({env: {memory:memory}});
+
+  var ref = [0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
+             0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0];
+  var array = new Uint8Array(memory.buffer);
+  array.set(ref, in_idx);  // Store reference value in memory.
+  instance.exports.throw_catch_simd();
+  assertArrayEquals(ref, array.slice(out_idx, out_idx + 0x10));
+})();

test/mjsunit/wasm/wasm-module-builder.js

@@ -468,6 +468,8 @@ let kExprI64AtomicCompareExchange32U = 0x4e;
 let kExprS128LoadMem = 0x00;
 let kExprS128StoreMem = 0x01;
 let kExprI32x4Splat = 0x0c;
+let kExprI32x4Eq = 0x2c;
+let kExprS1x4AllTrue = 0x75;
 let kExprF32x4Min = 0x9e;
 
 // Compilation hint constants.