[HIP] compressed bundle format defaults to v3

HIP runtime support for compressed bundle format v3 is in place,
therefore switch the default compressed bundle format to v3
in compiler.

This allows both compressed and decompressed fat binary size
to exceed 4GB by default.

Environment variable COMPRESSED_BUNDLE_FORMAT_VERSION=2 can
be used for backward compatibility for older HIP runtimes
not supporting v3.

Fixes: SWDEV-548879

Author: yxsamliu

clang/docs/ClangOffloadBundler.rst

@@ -525,15 +525,15 @@ The compressed offload bundle begins with a header followed by the compressed bi
     This is a unique identifier to distinguish compressed offload bundles. The value is the string 'CCOB' (Compressed Clang Offload Bundle).
 
 - **Version Number (16-bit unsigned int)**:
-    This denotes the version of the compressed offload bundle format. The current version is `2`.
+    This denotes the version of the compressed offload bundle format. The current version is `3`.
 
 - **Compression Method (16-bit unsigned int)**:
     This field indicates the compression method used. The value corresponds to either `zlib` or `zstd`, represented as a 16-bit unsigned integer cast from the LLVM compression enumeration.
 
-- **Total File Size (32-bit unsigned int)**:
+- **Total File Size (unsigned int, 32-bit in v2, 64-bit in v3)**:
     This is the total size (in bytes) of the file, including the header. Available in version 2 and above.
 
-- **Uncompressed Binary Size (32-bit unsigned int)**:
+- **Uncompressed Binary Size (unsigned int, 32-bit in v2, 64-bit in v3)**:
     This is the size (in bytes) of the binary data before it was compressed.
 
 - **Hash (64-bit unsigned int)**:
@@ -542,4 +542,4 @@ The compressed offload bundle begins with a header followed by the compressed bi
 - **Compressed Data**:
     The actual compressed binary data follows the header. Its size can be inferred from the total size of the file minus the header size.
 
-    > **Note**: Version 3 of the format is under development. It uses 64-bit fields for Total File Size and Uncompressed Binary Size to support files larger than 4GB. To experiment with version 3, set the environment variable `COMPRESSED_BUNDLE_FORMAT_VERSION=3`. This support is experimental and not recommended for production use.
+    > **Note**: Version 3 is now the default format. For backward compatibility with older HIP runtimes that support version 2 only, set the environment variable `COMPRESSED_BUNDLE_FORMAT_VERSION=2`.

clang/include/clang/Driver/OffloadBundler.h

@@ -136,7 +136,7 @@ class CompressedOffloadBundle {
 
   static inline const llvm::StringRef MagicNumber = "CCOB";
 
-  static inline const uint16_t DefaultVersion = 2;
+  static inline const uint16_t DefaultVersion = 3;
 
   // Helper method to get header size based on version
   static size_t getHeaderSize(uint16_t Version) {

clang/test/Driver/clang-offload-bundler-zlib.c

@@ -66,6 +66,30 @@
 // NOHOST-V3-DAG: hip-amdgcn-amd-amdhsa--gfx900
 // NOHOST-V3-DAG: hip-amdgcn-amd-amdhsa--gfx906
 
+// Check compression/decompression of offload bundle using version 2 format.
+//
+// RUN: env OFFLOAD_BUNDLER_COMPRESS=1 OFFLOAD_BUNDLER_VERBOSE=1 COMPRESSED_BUNDLE_FORMAT_VERSION=2 \
+// RUN:   clang-offload-bundler -type=bc -targets=hip-amdgcn-amd-amdhsa--gfx900,hip-amdgcn-amd-amdhsa--gfx906 \
+// RUN:   -input=%t.tgt1 -input=%t.tgt2 -output=%t.hip.bundle.bc 2>&1 | \
+// RUN:   FileCheck -check-prefix=COMPRESS-V2 %s
+// RUN: clang-offload-bundler -type=bc -list -input=%t.hip.bundle.bc | FileCheck -check-prefix=NOHOST-V2 %s
+// RUN: env OFFLOAD_BUNDLER_VERBOSE=1 \
+// RUN:   clang-offload-bundler -type=bc -targets=hip-amdgcn-amd-amdhsa--gfx900,hip-amdgcn-amd-amdhsa--gfx906 \
+// RUN:   -output=%t.res.tgt1 -output=%t.res.tgt2 -input=%t.hip.bundle.bc -unbundle 2>&1 | \
+// RUN:   FileCheck -check-prefix=DECOMPRESS-V2 %s
+// RUN: diff %t.tgt1 %t.res.tgt1
+// RUN: diff %t.tgt2 %t.res.tgt2
+//
+// COMPRESS-V2: Compressed bundle format version: 2
+// COMPRESS-V2: Compression method used: zlib
+// COMPRESS-V2: Compression level: 6
+// DECOMPRESS-V2: Compressed bundle format version: 2
+// DECOMPRESS-V2: Decompression method: zlib
+// DECOMPRESS-V2: Hashes match: Yes
+// NOHOST-V2-NOT: host-
+// NOHOST-V2-DAG: hip-amdgcn-amd-amdhsa--gfx900
+// NOHOST-V2-DAG: hip-amdgcn-amd-amdhsa--gfx906
+
 // Check -compression-level= option
 
 // RUN: clang-offload-bundler -type=bc -targets=hip-amdgcn-amd-amdhsa--gfx900,hip-amdgcn-amd-amdhsa--gfx906 \

clang/test/Driver/clang-offload-bundler-zstd.c

@@ -29,11 +29,11 @@
 // RUN: diff %t.tgt1 %t.res.tgt1
 // RUN: diff %t.tgt2 %t.res.tgt2
 //
-// CHECK: Compressed bundle format version: 2
+// CHECK: Compressed bundle format version: 3
 // CHECK: Total file size (including headers): [[SIZE:[0-9]*]] bytes
 // CHECK: Compression method used: zstd
 // CHECK: Compression level: 3
-// CHECK: Compressed bundle format version: 2
+// CHECK: Compressed bundle format version: 3
 // CHECK: Total file size (from header): [[SIZE]] bytes
 // CHECK: Decompression method: zstd
 // CHECK: Hashes match: Yes