[AMDGPU][Waitcnt] fix "comparison of integers of different signs" build error

Build error on Android; reported by and fix provided by (thanks) by Mauro Rossi <issor.oruam@gmail.com>

Fixes the following building error:

external/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp:1903:61:
error: comparison of integers of different signs:
'typename iterator_traits<__wrap_iter<MachineBasicBlock **> >::difference_type'
(aka 'int') and 'unsigned int' [-Werror,-Wsign-compare]
                      BlockWaitcntProcessedSet.end(), &MBB) < Count)) {
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~
1 error generated.

Differential Revision: https://reviews.llvm.org/D49089

llvm-svn: 336588

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index c404a6d291b..913e22ea381 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -1904,7 +1904,7 @@ bool SIInsertWaitcnts::runOnMachineFunction(MachineFunction &MF) {
       // If the loop has multiple back-edges, and so more than one "bottom"
       // basic block, we have to guarantee a re-walk over every blocks.
       if ((std::count(BlockWaitcntProcessedSet.begin(),
-                      BlockWaitcntProcessedSet.end(), &MBB) < Count)) {
+                      BlockWaitcntProcessedSet.end(), &MBB) < (int)Count)) {
         BlockWaitcntBracketsMap[&MBB]->setRevisitLoop(true);
         LLVM_DEBUG(dbgs() << "set-revisit1: Block"
                           << ContainingLoop->getHeader()->getNumber() << '\n';);