[llvm-branch-commits] [clang] 4b2e7d0 - [amdgpu] Default to code object v3

[Jon Chesterfield via llvm-branch-commits]

Author: Jon Chesterfield
Date: 2020-12-15T01:11:09Z
New Revision: 4b2e7d0215021d0d1df1a6319884b21d33936265

URL: https://github.com/llvm/llvm-project/commit/4b2e7d0215021d0d1df1a6319884b21d33936265
DIFF: https://github.com/llvm/llvm-project/commit/4b2e7d0215021d0d1df1a6319884b21d33936265.diff

LOG: [amdgpu] Default to code object v3

[amdgpu] Default to code object v3
v4 is not yet readily available, and doesn't appear
to be implemented in the back end

Reviewed By: t-tye

Differential Revision: https://reviews.llvm.org/D93258

Added: 
    

Modified: 
    clang/include/clang/Driver/Options.td
    clang/lib/Driver/ToolChains/CommonArgs.cpp
    llvm/docs/AMDGPUUsage.rst

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 67d41c3711f5..87c786065fa9 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2811,7 +2811,7 @@ def mexec_model_EQ : Joined<["-"], "mexec-model=">, Group<m_wasm_Features_Driver
                      HelpText<"Execution model (WebAssembly only)">;
 
 def mcode_object_version_EQ : Joined<["-"], "mcode-object-version=">, Group<m_Group>,
-  HelpText<"Specify code object ABI version. Defaults to 4. (AMDGPU only)">,
+  HelpText<"Specify code object ABI version. Defaults to 3. (AMDGPU only)">,
   MetaVarName<"<version>">, Values<"2,3,4">;
 
 def mcode_object_v3_legacy : Flag<["-"], "mcode-object-v3">, Group<m_Group>,

diff  --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 72bedc16846d..04d0e0771f70 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -1549,7 +1549,7 @@ unsigned tools::getOrCheckAMDGPUCodeObjectVersion(
     const Driver &D, const llvm::opt::ArgList &Args, bool Diagnose) {
   const unsigned MinCodeObjVer = 2;
   const unsigned MaxCodeObjVer = 4;
-  unsigned CodeObjVer = 4;
+  unsigned CodeObjVer = 3;
 
   // Emit warnings for legacy options even if they are overridden.
   if (Diagnose) {

diff  --git a/llvm/docs/AMDGPUUsage.rst b/llvm/docs/AMDGPUUsage.rst
index e5d081a37500..95fb164310cc 100644
--- a/llvm/docs/AMDGPUUsage.rst
+++ b/llvm/docs/AMDGPUUsage.rst
@@ -911,12 +911,12 @@ The AMDGPU backend uses the following ELF header:
 
   * ``ELFABIVERSION_AMDGPU_HSA_V3`` is used to specify the version of AMD HSA
     runtime ABI for code object V3. Specify using the Clang option
-    ``-mcode-object-version=3``.
+    ``-mcode-object-version=3``. This is the default code object
+    version if not specified.
 
   * ``ELFABIVERSION_AMDGPU_HSA_V4`` is used to specify the version of AMD HSA
     runtime ABI for code object V4. Specify using the Clang option
-    ``-mcode-object-version=4``. This is the default code object
-    version if not specified.
+    ``-mcode-object-version=4``.
 
   * ``ELFABIVERSION_AMDGPU_PAL`` is used to specify the version of AMD PAL
     runtime ABI.
@@ -2871,10 +2871,6 @@ non-AMD key names should be prefixed by "*vendor-name*.".
 Code Object V3 Metadata
 +++++++++++++++++++++++
 
-.. warning::
-  Code object V3 is not the default code object version emitted by this version
-  of LLVM.
-
 Code object V3 to V4 metadata is specified by the ``NT_AMDGPU_METADATA`` note
 record (see :ref:`amdgpu-note-records-v3-v4`).
 
@@ -3279,6 +3275,10 @@ same *vendor-name*.
 Code Object V4 Metadata
 +++++++++++++++++++++++
 
+.. warning::
+  Code object V4 is not the default code object version emitted by this version
+  of LLVM.
+
 Code object V4 metadata is the same as
 :ref:`amdgpu-amdhsa-code-object-metadata-v3` with the changes and additions
 defined in table :ref:`amdgpu-amdhsa-code-object-metadata-map-table-v3`.