Revert PR16726: extend rol/ror matching

There is a buildbot failure. Need to investigate this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191048 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 0 insertions, 111 deletions

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index b18c69b..0eecd39 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3341,7 +3341,6 @@ SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS, SDLoc DL) {
   unsigned OpSizeInBits = VT.getSizeInBits();
   SDValue LHSShiftArg = LHSShift.getOperand(0);
   SDValue LHSShiftAmt = LHSShift.getOperand(1);
-  SDValue RHSShiftArg = RHSShift.getOperand(0);
   SDValue RHSShiftAmt = RHSShift.getOperand(1);
 
   // fold (or (shl x, C1), (srl x, C2)) -> (rotl x, C1)
@@ -3425,23 +3424,6 @@ SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS, SDLoc DL) {
           return DAG.getNode(HasROTL ? ISD::ROTL : ISD::ROTR, DL, VT,
                              LHSShiftArg,
                              HasROTL ? LHSShiftAmt : RHSShiftAmt).getNode();
-        else if (LHSShiftArg.getOpcode() == ISD::ZERO_EXTEND ||
-                 LHSShiftArg.getOpcode() == ISD::ANY_EXTEND) {
-          // fold (or (shl (*ext x), (*ext y)),
-          //          (srl (*ext x), (*ext (sub 32, y)))) ->
-          //   (*ext (rotl x, y))
-          // fold (or (shl (*ext x), (*ext y)),
-          //          (srl (*ext x), (*ext (sub 32, y)))) ->
-          //   (*ext (rotr x, (sub 32, y)))
-          SDValue LArgExtOp0 = LHSShiftArg.getOperand(0);
-          EVT LArgVT = LArgExtOp0.getValueType();
-          if (LArgVT.getSizeInBits() == SUBC->getAPIntValue()) {
-            SDValue V = DAG.getNode(HasROTL ? ISD::ROTL : ISD::ROTR, DL, LArgVT,
-                             LArgExtOp0,
-                             HasROTL ? LHSShiftAmt : RHSShiftAmt);
-            return DAG.getNode(LHSShiftArg.getOpcode(), DL, VT, V).getNode();
-          }
-        }
     } else if (LExtOp0.getOpcode() == ISD::SUB &&
                RExtOp0 == LExtOp0.getOperand(1)) {
       // fold (or (shl x, (*ext (sub 32, y))), (srl x, (*ext y))) ->
@@ -3454,23 +3436,6 @@ SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS, SDLoc DL) {
           return DAG.getNode(HasROTR ? ISD::ROTR : ISD::ROTL, DL, VT,
                              LHSShiftArg,
                              HasROTR ? RHSShiftAmt : LHSShiftAmt).getNode();
-        else if (RHSShiftArg.getOpcode() == ISD::ZERO_EXTEND ||
-                 RHSShiftArg.getOpcode() == ISD::ANY_EXTEND) {
-          // fold (or (shl (*ext x), (*ext (sub 32, y))),
-          //          (srl (*ext x), (*ext y))) ->
-          //   (*ext (rotl x, y))
-          // fold (or (shl (*ext x), (*ext (sub 32, y))),
-          //          (srl (*ext x), (*ext y))) ->
-          //   (*ext (rotr x, (sub 32, y)))
-          SDValue RArgExtOp0 = RHSShiftArg.getOperand(0);
-          EVT RArgVT = RArgExtOp0.getValueType();
-          if (RArgVT.getSizeInBits() == SUBC->getAPIntValue()) {
-            SDValue V = DAG.getNode(HasROTR ? ISD::ROTR : ISD::ROTL, DL, RArgVT,
-                             RArgExtOp0,
-                             HasROTR ? RHSShiftAmt : LHSShiftAmt);
-            return DAG.getNode(RHSShiftArg.getOpcode(), DL, VT, V).getNode();
-          }
-        }
     }
   }
 
diff --git a/test/CodeGen/X86/rotate3.ll b/test/CodeGen/X86/rotate3.ll
deleted file mode 100644
index b92f7c2..0000000
--- a/test/CodeGen/X86/rotate3.ll
+++ /dev/null
@@ -1,76 +0,0 @@
-; Check that (or (shl x, y), (srl x, (sub 32, y))) is folded into (rotl x, y)
-; and (or (shl x, (sub 32, y)), (srl x, r)) into (rotr x, y) even if the
-; argument is zero extended. Fix for PR16726.
-
-; RUN: llc < %s -march=x86-64 -mcpu=corei7 | FileCheck %s
-
-define zeroext i8 @rolbyte(i32 %nBits_arg, i8 %x_arg) nounwind readnone {
-entry:
-  %tmp1 = zext i8 %x_arg to i32
-  %tmp3 = shl i32 %tmp1, %nBits_arg
-  %tmp8 = sub i32 8, %nBits_arg
-  %tmp10 = lshr i32 %tmp1, %tmp8
-  %tmp11 = or i32 %tmp3, %tmp10
-  %tmp12 = trunc i32 %tmp11 to i8
-  ret i8 %tmp12
-}
-; CHECK:    rolb %cl, %{{[a-z0-9]+}}
-
-
-define zeroext i8 @rorbyte(i32 %nBits_arg, i8 %x_arg) nounwind readnone {
-entry:
-  %tmp1 = zext i8 %x_arg to i32
-  %tmp3 = lshr i32 %tmp1, %nBits_arg
-  %tmp8 = sub i32 8, %nBits_arg
-  %tmp10 = shl i32 %tmp1, %tmp8
-  %tmp11 = or i32 %tmp3, %tmp10
-  %tmp12 = trunc i32 %tmp11 to i8
-  ret i8 %tmp12
-}
-; CHECK:    rorb %cl, %{{[a-z0-9]+}}
-
-define zeroext i16 @rolword(i32 %nBits_arg, i16 %x_arg) nounwind readnone {
-entry:
-  %tmp1 = zext i16 %x_arg to i32
-  %tmp3 = shl i32 %tmp1, %nBits_arg
-  %tmp8 = sub i32 16, %nBits_arg
-  %tmp10 = lshr i32 %tmp1, %tmp8
-  %tmp11 = or i32 %tmp3, %tmp10
-  %tmp12 = trunc i32 %tmp11 to i16
-  ret i16 %tmp12
-}
-; CHECK:    rolw %cl, %{{[a-z0-9]+}}
-
-define zeroext i16 @rorword(i32 %nBits_arg, i16 %x_arg) nounwind readnone {
-entry:
-  %tmp1 = zext i16 %x_arg to i32
-  %tmp3 = lshr i32 %tmp1, %nBits_arg
-  %tmp8 = sub i32 16, %nBits_arg
-  %tmp10 = shl i32 %tmp1, %tmp8
-  %tmp11 = or i32 %tmp3, %tmp10
-  %tmp12 = trunc i32 %tmp11 to i16
-  ret i16 %tmp12
-}
-; CHECK:    rorw %cl, %{{[a-z0-9]+}}
-
-define i64 @roldword(i64 %nBits_arg, i32 %x_arg) nounwind readnone {
-entry:
-  %tmp1 = zext i32 %x_arg to i64
-  %tmp3 = shl i64 %tmp1, %nBits_arg
-  %tmp8 = sub i64 32, %nBits_arg
-  %tmp10 = lshr i64 %tmp1, %tmp8
-  %tmp11 = or i64 %tmp3, %tmp10
-  ret i64 %tmp11
-}
-; CHECK:    roll %cl, %{{[a-z0-9]+}}
-
-define zeroext i64 @rordword(i64 %nBits_arg, i32 %x_arg) nounwind readnone {
-entry:
-  %tmp1 = zext i32 %x_arg to i64
-  %tmp3 = lshr i64 %tmp1, %nBits_arg
-  %tmp8 = sub i64 32, %nBits_arg
-  %tmp10 = shl i64 %tmp1, %tmp8
-  %tmp11 = or i64 %tmp3, %tmp10
-  ret i64 %tmp11
-}
-; CHECK:    rorl %cl, %{{[a-z0-9]+}}