From 977d95a2ff3327316e1859ef2d198b752a0d36e9 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Tue, 31 Aug 2010 01:27:49 +0000 Subject: Add experimental -disable-physical-join command line option. Eventually, we want to disable physreg coalescing completely, and let the register allocator do its job using hints. This option makes it possible to measure the impact of disabling physreg coalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112567 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SimpleRegisterCoalescing.cpp | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'lib/CodeGen') diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp index 34c4841..5dd5fdb 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -59,6 +59,11 @@ DisableCrossClassJoin("disable-cross-class-join", cl::desc("Avoid coalescing cross register class copies"), cl::init(false), cl::Hidden); +static cl::opt +DisablePhysicalJoin("disable-physical-join", + cl::desc("Avoid coalescing physical register copies"), + cl::init(false), cl::Hidden); + INITIALIZE_AG_PASS(SimpleRegisterCoalescing, RegisterCoalescer, "simple-register-coalescing", "Simple Register Coalescing", false, false, true); @@ -1036,6 +1041,11 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) { return false; // Not coalescable. } + if (DisablePhysicalJoin && CP.isPhys()) { + DEBUG(dbgs() << "\tPhysical joins disabled.\n"); + return false; + } + DEBUG(dbgs() << "\tConsidering merging %reg" << CP.getSrcReg()); // Enforce policies. -- cgit v1.1