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Avoid processing early clobbers twice in RegAllocFast.

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Early clobbers defining a virtual register were first alocated to a physreg and
then processed as a physreg EC, spilling the virtreg.

This fixes PR7382.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105998 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-06-15 16:20:57 +00:00
parent 40d07bbebb
commit 75ac4d9c2d
2 changed files with 37 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/RegAllocFast.cpp
+8 -3
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@@ -708,7 +708,8 @@ void RAFast::AllocateBasicBlock() {
if (MO.isUse()) {
usePhysReg(MO);
} else if (MO.isEarlyClobber()) {
definePhysReg(MI, Reg, MO.isDead() ? regFree : regReserved);
definePhysReg(MI, Reg, (MO.isImplicit() || MO.isDead()) ?
regFree : regReserved);
PhysECs.push_back(Reg);
}
}
@@ -731,8 +732,11 @@ void RAFast::AllocateBasicBlock() {
// Note: defineVirtReg may invalidate MO.
LiveRegMap::iterator LRI = defineVirtReg(MI, i, Reg, 0);
unsigned PhysReg = LRI->second.PhysReg;
setPhysReg(MI, i, PhysReg);
if (setPhysReg(MI, i, PhysReg))
VirtDead.push_back(Reg);
PhysECs.push_back(PhysReg);
// Don't attempt coalescing when earlyclobbers are present.
CopyDst = 0;
}
}
@@ -767,7 +771,8 @@ void RAFast::AllocateBasicBlock() {
// Allocate defs and collect dead defs.
for (unsigned i = 0; i != DefOpEnd; ++i) {
MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg() || !MO.isDef() || !MO.getReg()) continue;
if (!MO.isReg() || !MO.isDef() || !MO.getReg() || MO.isEarlyClobber())
continue;
unsigned Reg = MO.getReg();
if (TargetRegisterInfo::isPhysicalRegister(Reg)) {