PPC: [wasm-simd] Remove some I64x2 instructions not in proposal

This is a partial port of :
2c38a477

Some of the opcodes were added back in later CLs.

Change-Id: Iba33b0930f5b7ec95cdbe6febaa38766a9a6344f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2826238Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73964}

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

@@ -2479,21 +2479,11 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
                  i.InputSimd128Register(1));
       break;
     }
-    case kPPC_I64x2MinS: {
-      __ vminsd(i.OutputSimd128Register(), i.InputSimd128Register(0),
-                i.InputSimd128Register(1));
-      break;
-    }
     case kPPC_I32x4MinS: {
       __ vminsw(i.OutputSimd128Register(), i.InputSimd128Register(0),
                 i.InputSimd128Register(1));
       break;
     }
-    case kPPC_I64x2MinU: {
-      __ vminud(i.OutputSimd128Register(), i.InputSimd128Register(0),
-                i.InputSimd128Register(1));
-      break;
-    }
     case kPPC_I32x4MinU: {
       __ vminuw(i.OutputSimd128Register(), i.InputSimd128Register(0),
                 i.InputSimd128Register(1));
@@ -2519,21 +2509,11 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
                 i.InputSimd128Register(1));
       break;
     }
-    case kPPC_I64x2MaxS: {
-      __ vmaxsd(i.OutputSimd128Register(), i.InputSimd128Register(0),
-                i.InputSimd128Register(1));
-      break;
-    }
     case kPPC_I32x4MaxS: {
       __ vmaxsw(i.OutputSimd128Register(), i.InputSimd128Register(0),
                 i.InputSimd128Register(1));
       break;
     }
-    case kPPC_I64x2MaxU: {
-      __ vmaxud(i.OutputSimd128Register(), i.InputSimd128Register(0),
-                i.InputSimd128Register(1));
-      break;
-    }
     case kPPC_I32x4MaxU: {
       __ vmaxuw(i.OutputSimd128Register(), i.InputSimd128Register(0),
                 i.InputSimd128Register(1));
@@ -2679,27 +2659,12 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
              kScratchSimd128Reg);
       break;
     }
-    case kPPC_I64x2GtU: {
-      __ vcmpgtud(i.OutputSimd128Register(), i.InputSimd128Register(0),
-                  i.InputSimd128Register(1));
-      break;
-    }
     case kPPC_I32x4GtU: {
       __ vcmpgtuw(i.OutputSimd128Register(), i.InputSimd128Register(0),
                   i.InputSimd128Register(1));
 
       break;
     }
-    case kPPC_I64x2GeU: {
-      __ vcmpequd(kScratchSimd128Reg, i.InputSimd128Register(0),
-                  i.InputSimd128Register(1));
-      __ vcmpgtud(i.OutputSimd128Register(), i.InputSimd128Register(0),
-                  i.InputSimd128Register(1));
-      __ vor(i.OutputSimd128Register(), i.OutputSimd128Register(),
-             kScratchSimd128Reg);
-
-      break;
-    }
     case kPPC_I32x4GeU: {
       __ vcmpequw(kScratchSimd128Reg, i.InputSimd128Register(0),
                   i.InputSimd128Register(1));

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

@@ -255,15 +255,9 @@ namespace compiler {
   V(PPC_I64x2Add)                    \
   V(PPC_I64x2Sub)                    \
   V(PPC_I64x2Mul)                    \
-  V(PPC_I64x2MinS)                   \
-  V(PPC_I64x2MinU)                   \
-  V(PPC_I64x2MaxS)                   \
-  V(PPC_I64x2MaxU)                   \
   V(PPC_I64x2Eq)                     \
   V(PPC_I64x2Ne)                     \
   V(PPC_I64x2GtS)                    \
-  V(PPC_I64x2GtU)                    \
-  V(PPC_I64x2GeU)                    \
   V(PPC_I64x2GeS)                    \
   V(PPC_I64x2Shl)                    \
   V(PPC_I64x2ShrS)                   \

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

@@ -177,15 +177,9 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kPPC_I64x2Add:
     case kPPC_I64x2Sub:
     case kPPC_I64x2Mul:
-    case kPPC_I64x2MinS:
-    case kPPC_I64x2MinU:
-    case kPPC_I64x2MaxS:
-    case kPPC_I64x2MaxU:
     case kPPC_I64x2Eq:
     case kPPC_I64x2Ne:
     case kPPC_I64x2GtS:
-    case kPPC_I64x2GtU:
-    case kPPC_I64x2GeU:
     case kPPC_I64x2GeS:
     case kPPC_I64x2Shl:
     case kPPC_I64x2ShrS: