[InstCombine] Remove unnecessary intrinsics demanded elts handling

As discussed on D28777 - we don't need to handle 'all element' shuffles inside InstCombiner::visitCallInst as InstCombiner::SimplifyDemandedVectorElts will do everything we need.

llvm-svn: 292365

1 files changed, 2 insertions, 22 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index 8d896109e9f..b0a03270f30 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -2327,40 +2327,20 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
 
   case Intrinsic::x86_ssse3_pshuf_b_128:
   case Intrinsic::x86_avx2_pshuf_b:
-  case Intrinsic::x86_avx512_pshuf_b_512: {
+  case Intrinsic::x86_avx512_pshuf_b_512:
     if (Value *V = simplifyX86pshufb(*II, *Builder))
       return replaceInstUsesWith(*II, V);
-
-    unsigned VWidth = II->getType()->getVectorNumElements();
-    APInt UndefElts(VWidth, 0);
-    APInt DemandedElts = APInt::getAllOnesValue(VWidth);
-    if (Value *V = SimplifyDemandedVectorElts(II, DemandedElts, UndefElts)) {
-      if (V != II)
-        return replaceInstUsesWith(*II, V);
-      return II;
-    }
     break;
-  }
 
   case Intrinsic::x86_avx_vpermilvar_ps:
   case Intrinsic::x86_avx_vpermilvar_ps_256:
   case Intrinsic::x86_avx512_vpermilvar_ps_512:
   case Intrinsic::x86_avx_vpermilvar_pd:
   case Intrinsic::x86_avx_vpermilvar_pd_256:
-  case Intrinsic::x86_avx512_vpermilvar_pd_512: {
+  case Intrinsic::x86_avx512_vpermilvar_pd_512:
     if (Value *V = simplifyX86vpermilvar(*II, *Builder))
       return replaceInstUsesWith(*II, V);
-
-    unsigned VWidth = II->getType()->getVectorNumElements();
-    APInt UndefElts(VWidth, 0);
-    APInt DemandedElts = APInt::getAllOnesValue(VWidth);
-    if (Value *V = SimplifyDemandedVectorElts(II, DemandedElts, UndefElts)) {
-      if (V != II)
-        return replaceInstUsesWith(*II, V);
-      return II;
-    }
     break;
-  }
 
   case Intrinsic::x86_avx2_permd:
   case Intrinsic::x86_avx2_permps: