[SelectionDAG] Add support for vector demandedelts in SRA opcodes

llvm-svn: 286461

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6d25ead..e272315 100644 (file)
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2265,7 +2265,8 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
     break;
   case ISD::SRA:
     if (const APInt *ShAmt = getValidShiftAmountConstant(Op)) {
-      computeKnownBits(Op.getOperand(0), KnownZero, KnownOne, Depth + 1);
+      computeKnownBits(Op.getOperand(0), KnownZero, KnownOne, DemandedElts,
+                       Depth + 1);
       KnownZero = KnownZero.lshr(*ShAmt);
       KnownOne  = KnownOne.lshr(*ShAmt);
       // If we know the value of the sign bit, then we know it is copied across

diff --git a/llvm/test/CodeGen/X86/known-bits-vector.ll b/llvm/test/CodeGen/X86/known-bits-vector.ll
index 63ac994..0ba3cb1 100644 (file)
--- a/llvm/test/CodeGen/X86/known-bits-vector.ll
+++ b/llvm/test/CodeGen/X86/known-bits-vector.ll
@@ -156,18 +156,12 @@ define <4 x i32> @knownbits_mask_shl_shuffle_lshr(<4 x i32> %a0) nounwind {
 define <4 x i32> @knownbits_mask_ashr_shuffle_lshr(<4 x i32> %a0) nounwind {
 ; X32-LABEL: knownbits_mask_ashr_shuffle_lshr:
 ; X32:       # BB#0:
-; X32-NEXT:    vpand {{\.LCPI.*}}, %xmm0, %xmm0
-; X32-NEXT:    vpsrad $15, %xmm0, %xmm0
-; X32-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[0,0,3,3]
-; X32-NEXT:    vpsrld $30, %xmm0, %xmm0
+; X32-NEXT:    vxorps %xmm0, %xmm0, %xmm0
 ; X32-NEXT:    retl
 ;
 ; X64-LABEL: knownbits_mask_ashr_shuffle_lshr:
 ; X64:       # BB#0:
-; X64-NEXT:    vpand {{.*}}(%rip), %xmm0, %xmm0
-; X64-NEXT:    vpsrad $15, %xmm0, %xmm0
-; X64-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[0,0,3,3]
-; X64-NEXT:    vpsrld $30, %xmm0, %xmm0
+; X64-NEXT:    vxorps %xmm0, %xmm0, %xmm0
 ; X64-NEXT:    retq
   %1 = and <4 x i32> %a0, <i32 131071, i32 -1, i32 -1, i32 131071>
   %2 = ashr <4 x i32> %1, <i32 15, i32 15, i32 15, i32 15>