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Anti-dependency breaking needs to be careful not to use reserved regs

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112832 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-09-02 17:12:55 +00:00
parent b1fcfbe89b
commit 9b041c92ef
2 changed files with 4 additions and 0 deletions
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2
lib/CodeGen/AggressiveAntiDepBreaker.cpp
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@ -654,6 +654,8 @@ bool AggressiveAntiDepBreaker::FindSuitableFreeRegisters(
if (R == RB) R = RE;
--R;
const unsigned NewSuperReg = *R;
// Don't consider non-allocatable registers
if (!AllocatableSet.test(NewSuperReg)) continue;
// Don't replace a register with itself.
if (NewSuperReg == SuperReg) continue;

2
lib/CodeGen/CriticalAntiDepBreaker.cpp
View File

@ -330,6 +330,8 @@ CriticalAntiDepBreaker::findSuitableFreeRegister(MachineInstr *MI,
for (TargetRegisterClass::iterator R = RC->allocation_order_begin(MF),
RE = RC->allocation_order_end(MF); R != RE; ++R) {
unsigned NewReg = *R;
// Don't consider non-allocatable registers
if (!AllocatableSet.test(NewReg)) continue;
// Don't replace a register with itself.
if (NewReg == AntiDepReg) continue;
// Don't replace a register with one that was recently used to repair