PPC/S390: Use bit_cast instead of reinterpret_cast on S128Const

Change-Id: Idb38b9f97b5a507abd6f65f0d6c126255069f979
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2917914Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74765}

src/compiler/backend/ppc/instruction-selector-ppc.cc

@@ -2510,13 +2510,13 @@ void InstructionSelector::VisitS128Const(Node* node) {
     // Which in this case is ineffective on LE.
     Emit(kPPC_S128Const, g.DefineAsRegister(node),
          g.UseImmediate(
-             wasm::SimdShuffle::Pack4Lanes(reinterpret_cast<uint8_t*>(val))),
-         g.UseImmediate(wasm::SimdShuffle::Pack4Lanes(
-             reinterpret_cast<uint8_t*>(val) + 4)),
-         g.UseImmediate(wasm::SimdShuffle::Pack4Lanes(
-             reinterpret_cast<uint8_t*>(val) + 8)),
-         g.UseImmediate(wasm::SimdShuffle::Pack4Lanes(
-             reinterpret_cast<uint8_t*>(val) + 12)));
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]))),
+         g.UseImmediate(
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]) + 4)),
+         g.UseImmediate(
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]) + 8)),
+         g.UseImmediate(
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]) + 12)));
   }
 }
 

src/compiler/backend/s390/instruction-selector-s390.cc

@@ -2766,13 +2766,13 @@ void InstructionSelector::VisitS128Const(Node* node) {
     // Which in this case is ineffective on LE.
     Emit(kS390_S128Const, g.DefineAsRegister(node),
          g.UseImmediate(
-             wasm::SimdShuffle::Pack4Lanes(reinterpret_cast<uint8_t*>(val))),
-         g.UseImmediate(wasm::SimdShuffle::Pack4Lanes(
-             reinterpret_cast<uint8_t*>(val) + 4)),
-         g.UseImmediate(wasm::SimdShuffle::Pack4Lanes(
-             reinterpret_cast<uint8_t*>(val) + 8)),
-         g.UseImmediate(wasm::SimdShuffle::Pack4Lanes(
-             reinterpret_cast<uint8_t*>(val) + 12)));
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]))),
+         g.UseImmediate(
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]) + 4)),
+         g.UseImmediate(
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]) + 8)),
+         g.UseImmediate(
+             wasm::SimdShuffle::Pack4Lanes(bit_cast<uint8_t*>(&val[0]) + 12)));
   }
 }