1 files changed, 76 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/hwloop4.ll b/llvm/test/CodeGen/Hexagon/hwloop4.ll
new file mode 100644
index 00000000000..d159c45e3fb
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/hwloop4.ll
@@ -0,0 +1,76 @@
+; RUN: llc -march=hexagon -mcpu=hexagonv5 < %s | FileCheck %s
+;
+; Remove the unnecessary 'add' instruction used for the hardware loop setup.
+
+; CHECK: [[OP0:r[0-9]+]] = add([[OP1:r[0-9]+]], #-[[OP2:[0-9]+]]
+; CHECK-NOT: add([[OP0]], #[[OP2]])
+; CHECK: lsr([[OP1]], #{{[0-9]+}})
+; CHECK: loop0
+
+define void @matrix_mul_matrix(i32 %N, i32* nocapture %C, i16* nocapture readnone %A, i16* nocapture readnone %B) #0 {
+entry:
+  %cmp4 = icmp eq i32 %N, 0
+  br i1 %cmp4, label %for.end, label %for.body.preheader
+
+for.body.preheader:
+  %maxval = add i32 %N, -7
+  %0 = icmp sgt i32 %maxval, 0
+  br i1 %0, label %for.body.preheader9, label %for.body.ur.preheader
+
+for.body.preheader9:
+  br label %for.body
+
+for.body:
+  %arrayidx.phi = phi i32* [ %arrayidx.inc.7, %for.body ], [ %C, %for.body.preheader9 ]
+  %i.05 = phi i32 [ %inc.7, %for.body ], [ 0, %for.body.preheader9 ]
+  store i32 %i.05, i32* %arrayidx.phi, align 4
+  %inc = add i32 %i.05, 1
+  %arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
+  store i32 %inc, i32* %arrayidx.inc, align 4
+  %inc.1 = add i32 %i.05, 2
+  %arrayidx.inc.1 = getelementptr i32, i32* %arrayidx.phi, i32 2
+  store i32 %inc.1, i32* %arrayidx.inc.1, align 4
+  %inc.2 = add i32 %i.05, 3
+  %arrayidx.inc.2 = getelementptr i32, i32* %arrayidx.phi, i32 3
+  store i32 %inc.2, i32* %arrayidx.inc.2, align 4
+  %inc.3 = add i32 %i.05, 4
+  %arrayidx.inc.3 = getelementptr i32, i32* %arrayidx.phi, i32 4
+  store i32 %inc.3, i32* %arrayidx.inc.3, align 4
+  %inc.4 = add i32 %i.05, 5
+  %arrayidx.inc.4 = getelementptr i32, i32* %arrayidx.phi, i32 5
+  store i32 %inc.4, i32* %arrayidx.inc.4, align 4
+  %inc.5 = add i32 %i.05, 6
+  %arrayidx.inc.5 = getelementptr i32, i32* %arrayidx.phi, i32 6
+  store i32 %inc.5, i32* %arrayidx.inc.5, align 4
+  %inc.6 = add i32 %i.05, 7
+  %arrayidx.inc.6 = getelementptr i32, i32* %arrayidx.phi, i32 7
+  store i32 %inc.6, i32* %arrayidx.inc.6, align 4
+  %inc.7 = add i32 %i.05, 8
+  %exitcond.7 = icmp slt i32 %inc.7, %maxval
+  %arrayidx.inc.7 = getelementptr i32, i32* %arrayidx.phi, i32 8
+  br i1 %exitcond.7, label %for.body, label %for.end.loopexit.ur-lcssa
+
+for.end.loopexit.ur-lcssa:
+  %1 = icmp eq i32 %inc.7, %N
+  br i1 %1, label %for.end, label %for.body.ur.preheader
+
+for.body.ur.preheader:
+  %arrayidx.phi.ur.ph = phi i32* [ %C, %for.body.preheader ], [ %arrayidx.inc.7, %for.end.loopexit.ur-lcssa ]
+  %i.05.ur.ph = phi i32 [ 0, %for.body.preheader ], [ %inc.7, %for.end.loopexit.ur-lcssa ]
+  br label %for.body.ur
+
+for.body.ur:
+  %arrayidx.phi.ur = phi i32* [ %arrayidx.inc.ur, %for.body.ur ], [ %arrayidx.phi.ur.ph, %for.body.ur.preheader ]
+  %i.05.ur = phi i32 [ %inc.ur, %for.body.ur ], [ %i.05.ur.ph, %for.body.ur.preheader ]
+  store i32 %i.05.ur, i32* %arrayidx.phi.ur, align 4
+  %inc.ur = add i32 %i.05.ur, 1
+  %exitcond.ur = icmp eq i32 %inc.ur, %N
+  %arrayidx.inc.ur = getelementptr i32, i32* %arrayidx.phi.ur, i32 1
+  br i1 %exitcond.ur, label %for.end.loopexit, label %for.body.ur
+
+for.end.loopexit:
+  br label %for.end
+
+for.end:
+  ret void
+}