R600: Do not predicated basic block with multiple alu clause

Test is not included as it is several 1000 lines long.
To test this functionnality, a test case must generate at least 2 ALU clauses,
where an ALU clause is ~110 instructions long.

NOTE: This is a candidate for the stable branch.
llvm-svn: 185943

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/R600/R600Packetizer.cpp b/llvm/lib/Target/R600/R600Packetizer.cpp
index 5ee51faea87..f4219bd476c 100644
--- a/llvm/lib/Target/R600/R600Packetizer.cpp
+++ b/llvm/lib/Target/R600/R600Packetizer.cpp
@@ -304,7 +304,8 @@ bool R600Packetizer::runOnMachineFunction(MachineFunction &Fn) {
     MachineBasicBlock::iterator End = MBB->end();
     MachineBasicBlock::iterator MI = MBB->begin();
     while (MI != End) {
-      if (MI->isKill()) {
+      if (MI->isKill() ||
+          (MI->getOpcode() == AMDGPU::CF_ALU && !MI->getOperand(8).getImm())) {
         MachineBasicBlock::iterator DeleteMI = MI;
         ++MI;
         MBB->erase(DeleteMI);