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Revert this dag combine change:

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Fold (zext (and x, cst)) -> (and (zext x), cst)

DAG combiner likes to optimize expression in the other way so this would end up cause an infinite looping.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91574 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-12-17 00:40:05 +00:00
parent caedfbc6ae
commit 4c2b001f13
2 changed files with 4 additions and 17 deletions
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13
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3202,19 +3202,6 @@ SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
X, DAG.getConstant(Mask, VT));
}
// Fold (zext (and x, cst)) -> (and (zext x), cst)
if (N0.getOpcode() == ISD::AND &&
N0.getOperand(1).getOpcode() == ISD::Constant &&
N0.getOperand(0).getOpcode() != ISD::TRUNCATE &&
N0.getOperand(0).hasOneUse()) {
APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
Mask.zext(VT.getSizeInBits());
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT,
N0.getOperand(0)),
DAG.getConstant(Mask, VT));
}
// fold (zext (load x)) -> (zext (truncate (zextload x)))
if (ISD::isNON_EXTLoad(N0.getNode()) &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||

8
test/CodeGen/CellSPU/and_ops.ll
View File

@ -1,9 +1,9 @@
; RUN: llc < %s -march=cellspu > %t1.s
; RUN: grep and %t1.s | count 230
; RUN: grep and %t1.s | count 234
; RUN: grep andc %t1.s | count 85
; RUN: grep andi %t1.s | count 39
; RUN: grep andhi %t1.s | count 28
; RUN: grep andbi %t1.s | count 2
; RUN: grep andi %t1.s | count 37
; RUN: grep andhi %t1.s | count 30
; RUN: grep andbi %t1.s | count 4
target datalayout = "E-p:32:32:128-f64:64:128-f32:32:128-i64:32:128-i32:32:128-i16:16:128-i8:8:128-i1:8:128-a0:0:128-v128:128:128-s0:128:128"
target triple = "spu"