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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-07-29 22:51:22 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-07-29 22:51:22 +0000 |
| commit | 73e7dced3892f2abb4344526147d4df0f62aee61 (patch) | |
| tree | 50421d085c033990e15663273d045974402d7c95 /lib/CodeGen/PHIElimination.cpp | |
| parent | 05bce0beee87512e52428d4b80f5a8e79a949576 (diff) | |
| download | llvm-73e7dced3892f2abb4344526147d4df0f62aee61.tar.gz llvm-73e7dced3892f2abb4344526147d4df0f62aee61.tar.bz2 llvm-73e7dced3892f2abb4344526147d4df0f62aee61.tar.xz | |
Add an isSSA() flag to MachineRegisterInfo.
This flag is true from isel to register allocation when the machine
function is required to be in SSA form. The TwoAddressInstructionPass
and PHIElimination passes clear the flag.
The SSA flag wil be used by the machine code verifier to check for SSA
form, and eventually an assertion can enforce it in +Asserts builds.
This will catch the common target error of creating machine code with
multiple defs of a virtual register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136532 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/PHIElimination.cpp')
| -rw-r--r-- | lib/CodeGen/PHIElimination.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index af65f13bf0..6994aa58fb 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/lib/CodeGen/PHIElimination.cpp @@ -109,6 +109,9 @@ bool PHIElimination::runOnMachineFunction(MachineFunction &MF) { bool Changed = false; + // This pass takes the function out of SSA form. + MRI->leaveSSA(); + // Split critical edges to help the coalescer if (!DisableEdgeSplitting) { if (LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>()) { |