Add test and enable SPV_KHR_bit_instructions

Author: pmatos

llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp

@@ -506,7 +506,7 @@ void SPIRV::RequirementHandler::checkSatisfiable(
   for (auto Ext : AllExtensions) {
     if (ST.canUseExtension(Ext))
       continue;
-    LLVM_DEBUG(dbgs() << "Extension not suported: "
+    LLVM_DEBUG(dbgs() << "Extension not supported: "
                       << getSymbolicOperandMnemonic(
                              OperandCategory::ExtensionOperand, Ext)
                       << "\n");
@@ -745,7 +745,12 @@ void addInstrRequirements(const MachineInstr &MI,
   case SPIRV::OpBitFieldInsert:
   case SPIRV::OpBitFieldSExtract:
   case SPIRV::OpBitFieldUExtract:
+    if (!ST.canUseExtension(SPIRV::Extension::SPV_KHR_bit_instructions)) {
+      Reqs.addCapability(SPIRV::Capability::Shader);
+      break;
+    }
     Reqs.addExtension(SPIRV::Extension::SPV_KHR_bit_instructions);
+    Reqs.addCapability(SPIRV::Capability::BitInstructions);
     break;
   case SPIRV::OpTypeRuntimeArray:
     Reqs.addCapability(SPIRV::Capability::Shader);

llvm/lib/Target/SPIRV/SPIRVSubtarget.cpp

@@ -41,7 +41,11 @@ cl::list<SPIRV::Extension::Extension> Extensions(
         clEnumValN(SPIRV::Extension::SPV_KHR_no_integer_wrap_decoration,
                    "SPV_KHR_no_integer_wrap_decoration",
                    "Adds decorations to indicate that a given instruction does "
-                   "not cause integer wrapping")));
+                   "not cause integer wrapping"),
+        clEnumValN(SPIRV::Extension::SPV_KHR_bit_instructions,
+                   "SPV_KHR_bit_instructions",
+                   "This enables bit instructions to be used by SPIR-V modules "
+                   "without the requiring the Shader capability")));
 
 // Compare version numbers, but allow 0 to mean unspecified.
 static bool isAtLeastVer(uint32_t Target, uint32_t VerToCompareTo) {

llvm/test/CodeGen/SPIRV/extensions/SPV_KHR_bit_instructions.ll

@@ -0,0 +1,24 @@
+; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s --spirv-extensions=SPV_KHR_bit_instructions -o - | FileCheck %s --check-prefix=CHECK-EXTENSION
+; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-NO-EXTENSION
+
+; CHECK-EXTENSION:      OpCapability BitInstructions
+; CHECK-EXTENSION-NEXT: OpExtension "SPV_KHR_bit_instructions"
+; CHECK-EXTENSION-NOT:  OpCabilitity Shader
+; CHECK-NO-EXTENSION:     OpCapability Shader
+; CHECK-NO-EXTENSION-NOT: OpCabilitity BitInstructions
+; CHECK-NO-EXTENSION-NOT: OpExtension "SPV_KHR_bit_instructions"
+
+
+; CHECK-EXTENSION: %[[#int:]] = OpTypeInt 32
+; CHECK-EXTENSION: OpBitReverse %[[#int]]
+; CHECK-NO-EXTENSION: %[[#int:]] = OpTypeInt 32
+; CHECK-NO-EXTENSION: OpBitReverse %[[#int]]
+
+define spir_kernel void @testBitRev(i32 %a, i32 %b, i32 %c, i32 addrspace(1)* nocapture %res) local_unnamed_addr {
+entry:
+  %call = tail call i32 @llvm.bitreverse.i32(i32 %b)
+  store i32 %call, i32 addrspace(1)* %res, align 4
+  ret void
+}
+
+declare i32 @llvm.bitreverse.i32(i32)

llvm/test/CodeGen/SPIRV/transcoding/OpBitReverse_i32.ll

@@ -1,8 +1,5 @@
 ; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-SPIRV
 
-; CHECK-SPIRV:      OpCapability BitInstructions
-; CHECK-SPIRV-NEXT: OpExtension "SPV_KHR_bit_instructions"
-
 ; CHECK-SPIRV: %[[#int:]] = OpTypeInt 32
 ; CHECK-SPIRV: OpBitReverse %[[#int]]