Add a bit to mark operands of asm's that conflict
with an earlyclobber operand elsewhere. Propagate
this bit and the earlyclobber bit through SDISel.
Change linear-scan RA not to allocate regs in a way
that conflicts with an earlyclobber. See also comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56290 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index 2cfa755..a99ccab 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -1050,7 +1050,8 @@
TargetRegisterClass::iterator E = RC->allocation_order_end(*mf_);
assert(I != E && "No allocatable register in this register class!");
for (; I != E; ++I)
- if (prt_->isRegAvail(*I)) {
+ if (prt_->isRegAvail(*I) &&
+ li_->noEarlyclobberConflict(cur->reg, *vrm_, *I)) {
FreeReg = *I;
if (FreeReg < inactiveCounts.size())
FreeRegInactiveCount = inactiveCounts[FreeReg];
@@ -1070,7 +1071,8 @@
for (; I != E; ++I) {
unsigned Reg = *I;
if (prt_->isRegAvail(Reg) && Reg < inactiveCounts.size() &&
- FreeRegInactiveCount < inactiveCounts[Reg]) {
+ FreeRegInactiveCount < inactiveCounts[Reg] &&
+ li_->noEarlyclobberConflict(cur->reg, *vrm_, Reg)) {
FreeReg = Reg;
FreeRegInactiveCount = inactiveCounts[Reg];
if (FreeRegInactiveCount == MaxInactiveCount)