6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-23 17:24:48 +00:00
Code Issues Projects Releases Wiki Activity

Actually, disable this code for now. More analysis and improvements to

Browse Source 
the X86 backend are needed before this should be enabled by default.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44657 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-12-06 07:44:31 +00:00
parent e70da20f9a
commit e00cbad78d
2 changed files with 7 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -2134,6 +2134,12 @@ SDOperand DAGCombiner::visitXOR(SDNode *N) {
/// visitShiftByConstant - Handle transforms common to the three shifts, when
/// the shift amount is a constant.
SDOperand DAGCombiner::visitShiftByConstant(SDNode *N, unsigned Amt) {
// FIXME: disable this for now. This pessimizes some common cases like:
//
//void foo(int *X, int i) { X[i & 1235] = 1; }
//int bar(int *X, int i) { return X[i & 255]; }
return SDOperand();
SDNode *LHS = N->getOperand(0).Val;
if (!LHS->hasOneUse()) return SDOperand();