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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122259 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-12-20 20:10:50 +00:00
parent b0de244f23
commit 025cc6e1be
2 changed files with 3 additions and 3 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3172,15 +3172,15 @@ SDValue DAGCombiner::visitSRL(SDNode *N) {
}
// fold (srl (trunc (srl x, c1)), c2) -> 0 or (trunc (srl x, (add c1, c2)))
// This is only valid if the OpSizeInBits + c1 = size of inner shift
if (N1C && N0.getOpcode() == ISD::TRUNCATE &&
N0.getOperand(0).getOpcode() == ISD::SRL &&
N0.getOperand(0)->getOperand(1).getOpcode() == ISD::Constant) {
isa<ConstantSDNode>(N0.getOperand(0)->getOperand(1))) {
uint64_t c1 =
cast<ConstantSDNode>(N0.getOperand(0)->getOperand(1))->getZExtValue();
uint64_t c2 = N1C->getZExtValue();
EVT InnerShiftVT = N0.getOperand(0)->getOperand(1).getValueType();
uint64_t InnerShiftSize = InnerShiftVT.getScalarType().getSizeInBits();
// This is only valid if the OpSizeInBits + c1 = size of inner shift.
if (c1 + OpSizeInBits == InnerShiftSize) {
if (c1 + c2 >= InnerShiftSize)
return DAG.getConstant(0, VT);

2
test/CodeGen/X86/x86_64-mul-by-const.ll
View File

@ -1,5 +1,5 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
; Formerly there were two shifts. 8771012.
; Formerly there were two shifts. rdar://8771012.
define i32 @f9188_mul365384439_shift27(i32 %A) nounwind {
; CHECK: imulq $365384439,