diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-23 01:13:32 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-23 01:13:32 +0000 |
| commit | cf14613455bc32b6a17821808595263e061335bc (patch) | |
| tree | 6759db054bebc784b7000772b7f09d7cb8337e17 | |
| parent | c9addc40101d28766438c8b0cfad1a78fcd6fbf9 (diff) | |
Track reserved registers separately from RegsAvailable.
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
| -rw-r--r-- | include/llvm/CodeGen/RegisterScavenging.h | 5 | ||||
| -rw-r--r-- | lib/CodeGen/RegisterScavenging.cpp | 9 |
2 files changed, 7 insertions, 7 deletions
diff --git a/include/llvm/CodeGen/RegisterScavenging.h b/include/llvm/CodeGen/RegisterScavenging.h index 8f90ca796b..3986a8dd7d 100644 --- a/include/llvm/CodeGen/RegisterScavenging.h +++ b/include/llvm/CodeGen/RegisterScavenging.h @@ -134,8 +134,9 @@ private: /// isUsed / isUnused - Test if a register is currently being used. /// - bool isUsed(unsigned Reg) const { return !RegsAvailable.test(Reg); } - bool isUnused(unsigned Reg) const { return RegsAvailable.test(Reg); } + bool isUsed(unsigned Reg) const { + return !RegsAvailable.test(Reg) || ReservedRegs.test(Reg); + } /// isAliasUsed - Is Reg or an alias currently in use? bool isAliasUsed(unsigned Reg) const; diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp index bb31e0a774..18523e5e69 100644 --- a/lib/CodeGen/RegisterScavenging.cpp +++ b/lib/CodeGen/RegisterScavenging.cpp @@ -59,9 +59,6 @@ void RegScavenger::initRegState() { // All registers started out unused. RegsAvailable.set(); - // Reserved registers are always used. - RegsAvailable ^= ReservedRegs; - if (!MBB) return; @@ -225,9 +222,11 @@ void RegScavenger::forward() { void RegScavenger::getRegsUsed(BitVector &used, bool includeReserved) { used = RegsAvailable; - if (!includeReserved) - used |= ReservedRegs; used.flip(); + if (includeReserved) + used |= ReservedRegs; + else + used.reset(ReservedRegs); } unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RC) const { |