3 files changed, 69 insertions, 2 deletions

diff --git a/llvm/test/tools/llvm-profdata/Inputs/compat.profdata.v1 b/llvm/test/tools/llvm-profdata/Inputs/compat.profdata.v1
new file mode 100644
index 00000000000..fd17459d091
--- /dev/null
+++ b/llvm/test/tools/llvm-profdata/Inputs/compat.profdata.v1
diff --git a/llvm/test/tools/llvm-profdata/compat.proftext b/llvm/test/tools/llvm-profdata/compat.proftext
new file mode 100644
index 00000000000..14da3374b5e
--- /dev/null
+++ b/llvm/test/tools/llvm-profdata/compat.proftext
@@ -0,0 +1,47 @@
+# Compatibility tests for older profile format versions. These ensure
+# that we don't break compatibility with an older profile version
+# without noticing it.
+
+# The input file at %S/Inputs/compat.profdata.v1 was generated with
+# llvm-profdata merge from r214548.
+
+# RUN: llvm-profdata show %S/Inputs/compat.profdata.v1 --function function_count_only --counts | FileCheck %s -check-prefix=FUNC_COUNT_ONLY
+function_count_only
+0
+1
+97531
+# FUNC_COUNT_ONLY:      Hash: 0x{{0+$}}
+# FUNC_COUNT_ONLY-NEXT: Counters: 1
+# FUNC_COUNT_ONLY-NEXT: Function count: 97531
+# FUNC_COUNT_ONLY-NEXT: Block counts: []
+
+# RUN: llvm-profdata show %S/Inputs/compat.profdata.v1 --function "name with spaces" --counts | FileCheck %s -check-prefix=SPACES
+name with spaces
+1024
+2
+0
+0
+# SPACES:      Hash: 0x{{0+}}400
+# SPACES-NEXT: Counters: 2
+# SPACES-NEXT: Function count: 0
+# SPACES-NEXT: Block counts: [0]
+
+# RUN: llvm-profdata show %S/Inputs/compat.profdata.v1 --function large_numbers --counts | FileCheck %s -check-prefix=LARGENUM
+large_numbers
+4611686018427387903
+6
+2305843009213693952
+1152921504606846976
+576460752303423488
+288230376151711744
+144115188075855872
+72057594037927936
+# LARGENUM:      Hash: 0x3fffffffffffffff
+# LARGENUM-NEXT: Counters: 6
+# LARGENUM-NEXT: Function count: 2305843009213693952
+# LARGENUM-NEXT: Block counts: [1152921504606846976, 576460752303423488, 288230376151711744, 144115188075855872, 72057594037927936]
+
+# RUN: llvm-profdata show %S/Inputs/compat.profdata.v1 | FileCheck %s -check-prefix=SUMMARY
+# SUMMARY: Total functions: 3
+# SUMMARY: Maximum function count: 2305843009213693952
+# SUMMARY: Maximum internal block count: 1152921504606846976
diff --git a/llvm/test/tools/llvm-profdata/hash-mismatch.proftext b/llvm/test/tools/llvm-profdata/hash-mismatch.proftext
index e4f1a4ca431..fe0d4fb4f6b 100644
--- a/llvm/test/tools/llvm-profdata/hash-mismatch.proftext
+++ b/llvm/test/tools/llvm-profdata/hash-mismatch.proftext
@@ -1,6 +1,18 @@
-# RUN: llvm-profdata merge %s -o %t.out 2>&1 | FileCheck %s
-# CHECK: hash-mismatch.proftext: foo: Function hash mismatch
+# If we see the same function name, but with different hashes, make
+# sure we keep both.
 
+# RUN: llvm-profdata merge %s -o %t 2>&1
+# RUN: llvm-profdata show %t -all-functions -counts > %t.out
+
+# The function ordering is non-deterministic, so we need to do our
+# checks in multiple runs.
+# RUN: FileCheck -check-prefix=FOO3 -check-prefix=BOTH %s -input-file %t.out
+# RUN: FileCheck -check-prefix=FOO4 -check-prefix=BOTH %s -input-file %t.out
+
+# FOO3: Hash: 0x{{0+}}3
+# FOO3-NEXT: Counters: 3
+# FOO3-NEXT: Function count: 1
+# FOO3-NEXT: Block counts: [2, 3]
 foo
 3
 3
@@ -8,6 +20,10 @@ foo
 2
 3
 
+# FOO4: Hash: 0x{{0+}}4
+# FOO4-NEXT: Counters: 4
+# FOO4-NEXT: Function count: 11
+# FOO4-NEXT: Block counts: [22, 33, 44]
 foo
 4
 4
@@ -15,3 +31,7 @@ foo
 22
 33
 44
+
+# BOTH: Total functions: 2
+# BOTH: Maximum function count: 11
+# BOTH: Maximum internal block count: 44