[SPIRV] Add option to add all KHR extensions

[s-perron]

In DXC, there is an option to enable all KHR extension. I would like to
extend the existing -spirv-ext backend commandline option to have the
same capability. It is like the special case for all execept it only
adds the SPV_KHR_* extensions.

Part of #137650.

[llvmbot]

@llvm/pr-subscribers-backend-spir-v

Author: Steven Perron (s-perron)

Changes

In DXC, there is an option to enable all KHR extension. I would like to
extend the existing -spirv-ext backend commandline option to have the
same capability. It is like the special case for all execept it only
adds the SPV_KHR_* extensions.

Part of #137650.

---

Full diff: https://github.com/llvm/llvm-project/pull/145535.diff

2 Files Affected:

• (modified) llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp (+7)
• (modified) llvm/test/CodeGen/SPIRV/extensions/enable-all-extensions-but-one.ll (+1)

diff --git a/llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp b/llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp
index fbaca4e0e4d81..365e586ba6018 100644
--- a/llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp
@@ -119,6 +119,13 @@ bool SPIRVExtensionsParser::parse(cl::Option &O, StringRef ArgName,
       continue;
     }
 
+    if (Token == "KHR") {
+      for (const auto &[ExtensionName, ExtensionEnum] : SPIRVExtensionMap)
+        if (StringRef(ExtensionName).starts_with("SPV_KHR_"))
+          EnabledExtensions.insert(ExtensionEnum);
+      continue;
+    }
+
     if (Token.empty() || (!Token.starts_with("+") && !Token.starts_with("-")))
       return O.error("Invalid extension list format: " + Token.str());
 
diff --git a/llvm/test/CodeGen/SPIRV/extensions/enable-all-extensions-but-one.ll b/llvm/test/CodeGen/SPIRV/extensions/enable-all-extensions-but-one.ll
index 02d21a1abafa5..7b7bdb193a468 100644
--- a/llvm/test/CodeGen/SPIRV/extensions/enable-all-extensions-but-one.ll
+++ b/llvm/test/CodeGen/SPIRV/extensions/enable-all-extensions-but-one.ll
@@ -1,4 +1,5 @@
 ; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv32-unknown-unknown --spirv-ext=all,-SPV_INTEL_arbitrary_precision_integers %s -o - | FileCheck %s
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv32-unknown-unknown --spirv-ext=KHR %s -o - | FileCheck %s
 
 define i6 @foo() {
   %call = tail call i32 @llvm.bitreverse.i32(i32 42)