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author | Andrew Trick <atrick@apple.com> | 2012-02-21 04:51:23 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2012-02-21 04:51:23 +0000 |
commit | 19273aec441411b4d571fdb87c6daa0fbe7a33a0 (patch) | |
tree | ea01b1d19560a814c4686c3edebacac5b9e40f06 /lib/CodeGen/RegAllocBasic.cpp | |
parent | e8ccb049136506cb71b84a55000bad3c1440ee7c (diff) | |
download | llvm-19273aec441411b4d571fdb87c6daa0fbe7a33a0.tar.gz llvm-19273aec441411b4d571fdb87c6daa0fbe7a33a0.tar.bz2 llvm-19273aec441411b4d571fdb87c6daa0fbe7a33a0.tar.xz |
Clear virtual registers after they are no longer referenced.
Passes after RegAlloc should be able to rely on MRI->getNumVirtRegs() == 0.
This makes sharing code for pre/postRA passes more robust.
Now, to check if a pass is running before the RA pipeline begins, use MRI->isSSA().
To check if a pass is running after the RA pipeline ends, use !MRI->getNumVirtRegs().
PEI resets virtual regs when it's done scavenging.
PTX will either have to provide its own PEI pass or assign physregs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151032 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegAllocBasic.cpp')
-rw-r--r-- | lib/CodeGen/RegAllocBasic.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/RegAllocBasic.cpp b/lib/CodeGen/RegAllocBasic.cpp index 18d6f47329..d1b289b363 100644 --- a/lib/CodeGen/RegAllocBasic.cpp +++ b/lib/CodeGen/RegAllocBasic.cpp @@ -342,7 +342,10 @@ bool RABasic::runOnMachineFunction(MachineFunction &mf) { // Write out new DBG_VALUE instructions. getAnalysis<LiveDebugVariables>().emitDebugValues(VRM); - // The pass output is in VirtRegMap. Release all the transient data. + // All machine operands and other references to virtual registers have been + // replaced. Remove the virtual registers and release all the transient data. + VRM->clearAllVirt(); + MRI->clearVirtRegs(); releaseMemory(); return true; |