xref: /llvm-project/llvm/test/Instrumentation/SanitizerCoverage/backedge-pruning.ll (revision fc1270dd2972b5302ff8717d7dcf754c22bbddc3) 
1; Test -sanitizer-coverage-trace-compares=1 and how it prunes backedge compares.
2; RUN: opt < %s -passes='module(sancov-module)' -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1  -sanitizer-coverage-prune-blocks=1 -S | FileCheck %s --check-prefix=PRUNE
3; RUN: opt < %s -passes='module(sancov-module)' -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1  -sanitizer-coverage-prune-blocks=0 -S | FileCheck %s --check-prefix=NOPRUNE
4
5target 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"
6target triple = "x86_64-unknown-linux-gnu"
7
8define dso_local void @foo(ptr nocapture readnone %a, i32 %n) local_unnamed_addr {
9entry:
10  br label %do.body
11
12do.body:
13  %i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
14  tail call void (...) @bar()
15  %inc = add nuw nsw i32 %i.0, 1
16  %cmp = icmp slt i32 %inc, %n
17;PRUNE-LABEL: foo
18;PRUNE-NOT: __sanitizer_cov_trace_cmp4
19;PRUNE: ret void
20
21;NOPRUNE-LABEL: foo
22;NOPRUNE: call void @__sanitizer_cov_trace_cmp4
23;NOPRUNE-NEXT: icmp
24;NOPRUNE: ret void
25
26  br i1 %cmp, label %do.body, label %do.end
27
28do.end:
29  ret void
30}
31
32declare dso_local void @bar(...) local_unnamed_addr
33