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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/RegAllocFast.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/RegAllocFast.cpp')
-rw-r--r-- | lib/CodeGen/RegAllocFast.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp index 6d7b5f4b65..b8b05a9f60 100644 --- a/lib/CodeGen/RegAllocFast.cpp +++ b/lib/CodeGen/RegAllocFast.cpp @@ -1104,6 +1104,10 @@ bool RAFast::runOnMachineFunction(MachineFunction &Fn) { while (*Defs) MRI->setPhysRegUsed(*Defs++); + // All machine operands and other references to virtual registers have been + // replaced. Remove the virtual registers. + MRI->clearVirtRegs(); + SkippedInstrs.clear(); StackSlotForVirtReg.clear(); LiveDbgValueMap.clear(); |