[wasm-simd] Indicate possible non-determinism in the interpreter

Bug: chromium:1077198
Change-Id: I74f7afbd2c0d7753ef620e5d5ddee60ee8a16718
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2176892Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67574}

src/wasm/wasm-interpreter.cc

@@ -2286,6 +2286,8 @@ class ThreadImpl {
     for (size_t i = 0; i < count; ++i) {                      \
       auto a = s1.val[LANE(i, s1)];                           \
       auto b = s2.val[LANE(i, s1)];                           \
+      auto result = expr;                                     \
+      possible_nondeterminism_ |= has_nondeterminism(result); \
       res.val[LANE(i, s1)] = expr;                            \
     }                                                         \
     Push(WasmValue(Simd128(res)));                            \
@@ -2365,7 +2367,9 @@ class ThreadImpl {
     stype res;                                                \
     for (size_t i = 0; i < count; ++i) {                      \
       auto a = s.val[i];                                      \
-      res.val[i] = expr;                        \
+      auto result = expr;                                     \
+      possible_nondeterminism_ |= has_nondeterminism(result); \
+      res.val[i] = result;                                    \
     }                                                         \
     Push(WasmValue(Simd128(res)));                            \
     return true;                                              \
@@ -2417,7 +2421,9 @@ class ThreadImpl {
     for (size_t i = 0; i < count; ++i) {                      \
       auto a = s1.val[i];                                     \
       auto b = s2.val[i];                                     \
-      res.val[i] = expr ? -1 : 0;                           \
+      auto result = expr;                                     \
+      possible_nondeterminism_ |= has_nondeterminism(result); \
+      res.val[i] = result ? -1 : 0;                           \
     }                                                         \
     Push(WasmValue(Simd128(res)));                            \
     return true;                                              \
@@ -2560,6 +2566,8 @@ class ThreadImpl {
     dst_type res;                                                             \
     for (size_t i = 0; i < count; ++i) {                                      \
       ctype a = s.val[LANE(start_index + i, s)];                              \
+      auto result = expr;                                                     \
+      possible_nondeterminism_ |= has_nondeterminism(result);                 \
       res.val[LANE(i, res)] = expr;                                           \
     }                                                                         \
     Push(WasmValue(Simd128(res)));                                            \
@@ -2636,10 +2644,12 @@ class ThreadImpl {
     stype s2 = v2.to_s128().to_##name();                                    \
     stype res;                                                              \
     for (size_t i = 0; i < count / 2; ++i) {                                \
-      res.val[LANE(i, s1)] =                                     \
-          s1.val[LANE(i * 2, s1)] + s1.val[LANE(i * 2 + 1, s1)]; \
-      res.val[LANE(i + count / 2, s1)] =                         \
-          s2.val[LANE(i * 2, s1)] + s2.val[LANE(i * 2 + 1, s1)]; \
+      auto result1 = s1.val[LANE(i * 2, s1)] + s1.val[LANE(i * 2 + 1, s1)]; \
+      possible_nondeterminism_ |= has_nondeterminism(result1);              \
+      res.val[LANE(i, s1)] = result1;                                       \
+      auto result2 = s2.val[LANE(i * 2, s1)] + s2.val[LANE(i * 2 + 1, s1)]; \
+      possible_nondeterminism_ |= has_nondeterminism(result2);              \
+      res.val[LANE(i + count / 2, s1)] = result2;                           \
     }                                                                       \
     Push(WasmValue(Simd128(res)));                                          \
     return true;                                                            \