1 files changed, 32 insertions, 0 deletions
diff --git a/llvm/test/Instrumentation/SanitizerCoverage/backedge-pruning.ll b/llvm/test/Instrumentation/SanitizerCoverage/backedge-pruning.ll
new file mode 100644
index 00000000000..10319831127
--- /dev/null
+++ b/llvm/test/Instrumentation/SanitizerCoverage/backedge-pruning.ll
@@ -0,0 +1,32 @@
+; Test -sanitizer-coverage-trace-compares=1 and how it prunes backedge compares.
+; RUN: opt < %s -sancov -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1  -sanitizer-coverage-prune-blocks=1 -S | FileCheck %s --check-prefix=PRUNE
+; RUN: opt < %s -sancov -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1  -sanitizer-coverage-prune-blocks=0 -S | FileCheck %s --check-prefix=NOPRUNE
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-unknown-linux-gnu"
+
+define dso_local void @foo(i32* nocapture readnone %a, i32 %n) local_unnamed_addr {
+entry:
+  br label %do.body
+
+do.body:
+  %i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
+  tail call void (...) @bar()
+  %inc = add nuw nsw i32 %i.0, 1
+  %cmp = icmp slt i32 %inc, %n
+;PRUNE-LABEL: foo
+;PRUNE-NOT: __sanitizer_cov_trace_cmp4
+;PRUNE: ret void
+
+;NOPRUNE-LABEL: foo
+;NOPRUNE: call void @__sanitizer_cov_trace_cmp4
+;NOPRUNE-NEXT: icmp
+;NOPRUNE: ret void
+
+  br i1 %cmp, label %do.body, label %do.end
+
+do.end:
+  ret void
+}
+
+declare dso_local void @bar(...) local_unnamed_addr