From 6e0f244d1f5c77a387d6ea78afbf6b7ffcde1a29 Mon Sep 17 00:00:00 2001 From: Matthias Braun Date: Wed, 19 Nov 2014 19:46:17 +0000 Subject: [PATCH] RegisterCoalescer: Improve debug messages - Show "Considering..." message after flipping so you actually see the final destination vreg as destination. - Add a message on final join, so you can grep for "Success" messages to obtain a list of which register got merged with which. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222382 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/RegisterCoalescer.cpp | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index a57bd24665d..2d2dc92a56b 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1105,6 +1105,11 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) { return false; } } else { + // When possible, let DstReg be the larger interval. + if (!CP.isPartial() && LIS->getInterval(CP.getSrcReg()).size() > + LIS->getInterval(CP.getDstReg()).size()) + CP.flip(); + DEBUG({ dbgs() << "\tConsidering merging to " << TRI->getRegClassName(CP.getNewRC()) << " with "; @@ -1117,11 +1122,6 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) { dbgs() << PrintReg(CP.getSrcReg(), TRI) << " in " << PrintReg(CP.getDstReg(), TRI, CP.getSrcIdx()) << '\n'; }); - - // When possible, let DstReg be the larger interval. - if (!CP.isPartial() && LIS->getInterval(CP.getSrcReg()).size() > - LIS->getInterval(CP.getDstReg()).size()) - CP.flip(); } // Okay, attempt to join these two intervals. On failure, this returns false. @@ -1186,7 +1186,9 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) { TRI->UpdateRegAllocHint(CP.getSrcReg(), CP.getDstReg(), *MF); DEBUG({ - dbgs() << "\tJoined. Result = "; + dbgs() << "\tSuccess: " << PrintReg(CP.getSrcReg(), TRI, CP.getSrcIdx()) + << " -> " << PrintReg(CP.getDstReg(), TRI, CP.getDstIdx()) << '\n'; + dbgs() << "\tResult = "; if (CP.isPhys()) dbgs() << PrintReg(CP.getDstReg(), TRI); else -- 2.34.1