VirtRegRewriter checks for early clobbers before it reuses an available stack
slot.
Teach it to also check for early clobbered aliases, and early clobber operands
following the current operand.
This fixes the miscompilation in PR8044 where EC registers eax and ecx were
being used for inputs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112988 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegRewriter.cpp b/lib/CodeGen/VirtRegRewriter.cpp
index 94a64ce..d988e10 100644
--- a/lib/CodeGen/VirtRegRewriter.cpp
+++ b/lib/CodeGen/VirtRegRewriter.cpp
@@ -2027,14 +2027,16 @@
CanReuse = !ReusedOperands.isClobbered(PhysReg) &&
Spills.canClobberPhysReg(PhysReg);
}
- // If this is an asm, and PhysReg is used elsewhere as an earlyclobber
- // operand, we can't also use it as an input. (Outputs always come
- // before inputs, so we can stop looking at i.)
+ // If this is an asm, and a PhysReg alias is used elsewhere as an
+ // earlyclobber operand, we can't also use it as an input.
if (MI.isInlineAsm()) {
- for (unsigned k=0; k<i; ++k) {
+ for (unsigned k = 0, e = MI.getNumOperands(); k != e; ++k) {
MachineOperand &MOk = MI.getOperand(k);
- if (MOk.isReg() && MOk.getReg()==PhysReg && MOk.isEarlyClobber()) {
+ if (MOk.isReg() && MOk.isEarlyClobber() &&
+ TRI->regsOverlap(MOk.getReg(), PhysReg)) {
CanReuse = false;
+ DEBUG(dbgs() << "Not reusing physreg " << TRI->getName(PhysReg)
+ << " for vreg" << VirtReg << ": " << MOk << '\n');
break;
}
}