[PGO] Handle and report overflow during profile merge for all types of data
Summary: Surface counter overflow when merging profile data. Merging still occurs on overflow but counts saturate to the maximum representable value. Overflow is reported to the user.
Reviewers: davidxl, dnovillo, silvas
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D15547
llvm-svn: 255825
diff --git a/llvm/test/tools/llvm-profdata/overflow-instr.test b/llvm/test/tools/llvm-profdata/overflow-instr.test
new file mode 100644
index 0000000..5b9a94a
--- /dev/null
+++ b/llvm/test/tools/llvm-profdata/overflow-instr.test
@@ -0,0 +1,17 @@
+Tests for overflow when merging instrumented profiles.
+
+1- Merge profile having maximum counts with itself and verify overflow detected and saturation occurred
+RUN: llvm-profdata merge -instr %p/Inputs/overflow-instr.proftext %p/Inputs/overflow-instr.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=MERGE_OVERFLOW
+RUN: llvm-profdata show -instr %t.out | FileCheck %s --check-prefix=SHOW_OVERFLOW
+MERGE_OVERFLOW: {{.*}}: overflow: Counter overflow
+SHOW_OVERFLOW: Total functions: 1
+SHOW_OVERFLOW-NEXT: Maximum function count: 18446744073709551615
+SHOW_OVERFLOW-NEXT: Maximum internal block count: 18446744073709551615
+
+2- Merge profile having maximum counts by itself and verify no overflow
+RUN: llvm-profdata merge -instr %p/Inputs/overflow-instr.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=MERGE_NO_OVERFLOW -allow-empty
+RUN: llvm-profdata show -instr %t.out | FileCheck %s --check-prefix=SHOW_NO_OVERFLOW
+MERGE_NO_OVERFLOW-NOT: {{.*}}: overflow: Counter overflow
+SHOW_NO_OVERFLOW: Total functions: 1
+SHOW_NO_OVERFLOW-NEXT: Maximum function count: 18446744073709551615
+SHOW_NO_OVERFLOW-NEXT: Maximum internal block count: 18446744073709551615