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Track reserved registers separately from RegsAvailable.

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The bulk masking operations from register mask operands don't account
for reserved registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151222 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-02-23 01:13:32 +00:00
parent c9addc4010
commit cf14613455
2 changed files with 7 additions and 7 deletions
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5
include/llvm/CodeGen/RegisterScavenging.h
View File

@@ -134,8 +134,9 @@ private:
/// isUsed / isUnused - Test if a register is currently being used. /// isUsed / isUnused - Test if a register is currently being used.
/// ///
bool isUsed(unsigned Reg) const { return !RegsAvailable.test(Reg); } bool isUsed(unsigned Reg) const {
bool isUnused(unsigned Reg) const { return RegsAvailable.test(Reg); } return !RegsAvailable.test(Reg) || ReservedRegs.test(Reg);
}
/// isAliasUsed - Is Reg or an alias currently in use? /// isAliasUsed - Is Reg or an alias currently in use?
bool isAliasUsed(unsigned Reg) const; bool isAliasUsed(unsigned Reg) const;

9
lib/CodeGen/RegisterScavenging.cpp
View File

@@ -59,9 +59,6 @@ void RegScavenger::initRegState() {
// All registers started out unused. // All registers started out unused.
RegsAvailable.set(); RegsAvailable.set();
// Reserved registers are always used.
RegsAvailable ^= ReservedRegs;
if (!MBB) if (!MBB)
return; return;
@@ -225,9 +222,11 @@ void RegScavenger::forward() {
void RegScavenger::getRegsUsed(BitVector &used, bool includeReserved) { void RegScavenger::getRegsUsed(BitVector &used, bool includeReserved) {
used = RegsAvailable; used = RegsAvailable;
if (!includeReserved)
used |= ReservedRegs;
used.flip(); used.flip();
if (includeReserved)
used |= ReservedRegs;
else
used.reset(ReservedRegs);
} }
unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RC) const { unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RC) const {