From da84e6468304500dc65813aee8728bee18ac6578 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Tue, 21 Feb 2012 04:51:23 +0000 Subject: 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. llvm-svn: 151032 --- llvm/lib/CodeGen/RegAllocBasic.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'llvm/lib/CodeGen/RegAllocBasic.cpp') diff --git a/llvm/lib/CodeGen/RegAllocBasic.cpp b/llvm/lib/CodeGen/RegAllocBasic.cpp index 18d6f47..d1b289b 100644 --- a/llvm/lib/CodeGen/RegAllocBasic.cpp +++ b/llvm/lib/CodeGen/RegAllocBasic.cpp @@ -342,7 +342,10 @@ bool RABasic::runOnMachineFunction(MachineFunction &mf) { // Write out new DBG_VALUE instructions. getAnalysis().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; -- cgit v1.1