s390 [wasm-simd]: Prototype sign select

Code fo Instruction Selection is added to the comments
and should be added when opcode is moved out of being a prototype.

Bug: v8:10983
Change-Id: I3d7a0435d7b7c8f21217863c3aa894ae5b90afae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2653808Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72378}

src/compiler/backend/s390/code-generator-s390.cc

@@ -4246,6 +4246,33 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     }
 #undef Q15_MUL_ROAUND
+#define SIGN_SELECT(mode)                                                      \
+  Simd128Register src0 = i.InputSimd128Register(0);                            \
+  Simd128Register src1 = i.InputSimd128Register(1);                            \
+  Simd128Register src2 = i.InputSimd128Register(2);                            \
+  Simd128Register dst = i.OutputSimd128Register();                             \
+  __ vx(kScratchDoubleReg, kScratchDoubleReg, kScratchDoubleReg, Condition(0), \
+        Condition(0), Condition(3));                                           \
+  __ vch(kScratchDoubleReg, kScratchDoubleReg, src2, Condition(0),             \
+         Condition(mode));                                                     \
+  __ vsel(dst, src0, src1, kScratchDoubleReg, Condition(0), Condition(0));
+    case kS390_I8x16SignSelect: {
+      SIGN_SELECT(0)
+      break;
+    }
+    case kS390_I16x8SignSelect: {
+      SIGN_SELECT(1)
+      break;
+    }
+    case kS390_I32x4SignSelect: {
+      SIGN_SELECT(2)
+      break;
+    }
+    case kS390_I64x2SignSelect: {
+      SIGN_SELECT(3)
+      break;
+    }
+#undef SIGN_SELECT
     case kS390_StoreCompressTagged: {
       CHECK(!instr->HasOutput());
       size_t index = 0;

src/compiler/backend/s390/instruction-codes-s390.h

@@ -263,6 +263,7 @@ namespace compiler {
   V(S390_I64x2SConvertI32x4High)            \
   V(S390_I64x2UConvertI32x4Low)             \
   V(S390_I64x2UConvertI32x4High)            \
+  V(S390_I64x2SignSelect)                   \
   V(S390_I32x4Splat)                        \
   V(S390_I32x4ExtractLane)                  \
   V(S390_I32x4ReplaceLane)                  \
@@ -299,6 +300,7 @@ namespace compiler {
   V(S390_I32x4ExtMulHighI16x8U)             \
   V(S390_I32x4ExtAddPairwiseI16x8S)         \
   V(S390_I32x4ExtAddPairwiseI16x8U)         \
+  V(S390_I32x4SignSelect)                   \
   V(S390_I16x8Splat)                        \
   V(S390_I16x8ExtractLaneU)                 \
   V(S390_I16x8ExtractLaneS)                 \
@@ -341,6 +343,7 @@ namespace compiler {
   V(S390_I16x8ExtAddPairwiseI8x16S)         \
   V(S390_I16x8ExtAddPairwiseI8x16U)         \
   V(S390_I16x8Q15MulRSatS)                  \
+  V(S390_I16x8SignSelect)                   \
   V(S390_I8x16Splat)                        \
   V(S390_I8x16ExtractLaneU)                 \
   V(S390_I8x16ExtractLaneS)                 \
@@ -373,6 +376,7 @@ namespace compiler {
   V(S390_I8x16BitMask)                      \
   V(S390_I8x16Shuffle)                      \
   V(S390_I8x16Swizzle)                      \
+  V(S390_I8x16SignSelect)                   \
   V(S390_V32x4AnyTrue)                      \
   V(S390_V16x8AnyTrue)                      \
   V(S390_V8x16AnyTrue)                      \

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

@@ -210,6 +210,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_I64x2SConvertI32x4High:
     case kS390_I64x2UConvertI32x4Low:
     case kS390_I64x2UConvertI32x4High:
+    case kS390_I64x2SignSelect:
     case kS390_I32x4Splat:
     case kS390_I32x4ExtractLane:
     case kS390_I32x4ReplaceLane:
@@ -246,6 +247,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_I32x4ExtMulHighI16x8U:
     case kS390_I32x4ExtAddPairwiseI16x8S:
     case kS390_I32x4ExtAddPairwiseI16x8U:
+    case kS390_I32x4SignSelect:
     case kS390_I16x8Splat:
     case kS390_I16x8ExtractLaneU:
     case kS390_I16x8ExtractLaneS:
@@ -288,6 +290,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_I16x8ExtAddPairwiseI8x16S:
     case kS390_I16x8ExtAddPairwiseI8x16U:
     case kS390_I16x8Q15MulRSatS:
+    case kS390_I16x8SignSelect:
     case kS390_I8x16Splat:
     case kS390_I8x16ExtractLaneU:
     case kS390_I8x16ExtractLaneS:
@@ -320,6 +323,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_I8x16BitMask:
     case kS390_I8x16Shuffle:
     case kS390_I8x16Swizzle:
+    case kS390_I8x16SignSelect:
     case kS390_V32x4AnyTrue:
     case kS390_V16x8AnyTrue:
     case kS390_V8x16AnyTrue: