RPCSX/llvm
1
0
Fork 0
mirror of https://github.com/RPCSX/llvm.git synced 2024-12-12 22:26:14 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Use COPY for fast-isel bitconvert, but don't create cross-class copies.

Browse Source 
This doesn't change the behavior of SelectBitcast for X86.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108073 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-07-11 05:16:54 +00:00
parent cbeeae23c3
commit e7917bb207
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -671,13 +671,12 @@ bool FastISel::SelectBitCast(const User *I) {
if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
ResultReg = createResultReg(DstClass);
bool InsertedCopy = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
ResultReg, Op0,
DstClass, SrcClass, DL);
if (!InsertedCopy)
ResultReg = 0;
// Don't attempt a cross-class copy. It will likely fail.
if (SrcClass == DstClass) {
ResultReg = createResultReg(DstClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
ResultReg).addReg(Op0);
}
}
// If the reg-reg copy failed, select a BIT_CONVERT opcode.