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The last commit was overly conservative. It's ok to reuse value that's already marked livein. 

llvm-svn: 65498
This commit is contained in:
Evan Cheng 2009-02-26 03:02:21 +00:00
parent ee5fd035e2
commit ca2d65467b
2 changed files with 1 additions and 8 deletions
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7
llvm/lib/CodeGen/VirtRegMap.cpp
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@ -516,18 +516,11 @@ void AvailableSpills::AddAvailableRegsToLiveIn(MachineBasicBlock &MBB,
I = PhysRegsAvailable.begin(), E = PhysRegsAvailable.end(); I = PhysRegsAvailable.begin(), E = PhysRegsAvailable.end();
I != E; ++I) { I != E; ++I) {
unsigned Reg = I->first; unsigned Reg = I->first;
bool MakeAvail = true;
const TargetRegisterClass* RC = TRI->getPhysicalRegisterRegClass(Reg); const TargetRegisterClass* RC = TRI->getPhysicalRegisterRegClass(Reg);
// FIXME: A temporary workaround. We can't reuse available value if it's // FIXME: A temporary workaround. We can't reuse available value if it's
// not safe to move the def of the virtual register's class. e.g. // not safe to move the def of the virtual register's class. e.g.
// X86::RFP* register classes. Do not add it as a live-in. // X86::RFP* register classes. Do not add it as a live-in.
if (!TII->isSafeToMoveRegClassDefs(RC)) if (!TII->isSafeToMoveRegClassDefs(RC))
MakeAvail = false;
if (MBB.isLiveIn(Reg))
// It's already livein somehow. Be conservative, do not make it available.
MakeAvail = false;
if (!MakeAvail)
// This is no longer available. // This is no longer available.
NotAvailable.insert(Reg); NotAvailable.insert(Reg);
else { else {

2
llvm/test/CodeGen/ARM/2008-11-19-ScavengerAssert.ll
View File

@ -1,5 +1,5 @@
; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin9 ; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin9
; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin9 -stats |& grep asm-printer | grep 185 ; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin9 -stats |& grep asm-printer | grep 186
%"struct.Adv5::Ekin<3>" = type <{ i8 }> %"struct.Adv5::Ekin<3>" = type <{ i8 }>
%"struct.Adv5::X::Energyflux<3>" = type { double } %"struct.Adv5::X::Energyflux<3>" = type { double }