Translate readnone attribute as function parameter attribute (intel#1697

)

Community restricted readnone, readonly and writeonly attributes
to be only function parameter attributes. This patch aligns
the translator with llvm.org.

It also fixes a bug, when readnone attribute is being mapped
to NoWrite SPIR-V function parameter attribute.

Signed-off-by: Sidorov, Dmitry <dmitry.sidorov@intel.com>

Signed-off-by: Sidorov, Dmitry <dmitry.sidorov@intel.com>

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@c1fe5fe

llvm-spirv/lib/SPIRV/SPIRVInternal.h

@@ -236,15 +236,14 @@ inline void SPIRVMap<Attribute::AttrKind, SPIRVFuncParamAttrKind>::init() {
   add(Attribute::NoAlias, FunctionParameterAttributeNoAlias);
   add(Attribute::NoCapture, FunctionParameterAttributeNoCapture);
   add(Attribute::ReadOnly, FunctionParameterAttributeNoWrite);
+  add(Attribute::ReadNone, FunctionParameterAttributeNoReadWrite);
 }
 typedef SPIRVMap<Attribute::AttrKind, SPIRVFuncParamAttrKind>
     SPIRSPIRVFuncParamAttrMap;
 
 template <>
 inline void
 SPIRVMap<Attribute::AttrKind, SPIRVFunctionControlMaskKind>::init() {
-  add(Attribute::ReadNone, FunctionControlPureMask);
-  add(Attribute::ReadOnly, FunctionControlConstMask);
   add(Attribute::AlwaysInline, FunctionControlInlineMask);
   add(Attribute::NoInline, FunctionControlDontInlineMask);
   add(Attribute::OptimizeNone, internal::FunctionControlOptNoneINTELMask);

llvm-spirv/lib/SPIRV/SPIRVReader.cpp

@@ -4378,7 +4378,9 @@ Instruction *SPIRVToLLVM::transOCLBuiltinFromExtInst(SPIRVExtInst *BC,
     if (isFuncNoUnwind())
       F->addFnAttr(Attribute::NoUnwind);
     if (isFuncReadNone(UnmangledName))
-      F->addFnAttr(Attribute::ReadNone);
+      for (llvm::Argument &Arg : F->args())
+        if (Arg.getType()->isPointerTy())
+          Arg.addAttr(Attribute::ReadNone);
   }
   auto Args = transValue(BC->getArgValues(), F, BB);
   SPIRVDBG(dbgs() << "[transOCLBuiltinFromExtInst] Function: " << *F

llvm-spirv/lib/SPIRV/SPIRVUtil.cpp

@@ -2065,8 +2065,10 @@ bool lowerBuiltinVariableToCall(GlobalVariable *GV,
     Func = Function::Create(FT, GlobalValue::ExternalLinkage, MangledName, M);
     Func->setCallingConv(CallingConv::SPIR_FUNC);
     Func->addFnAttr(Attribute::NoUnwind);
-    Func->addFnAttr(Attribute::ReadNone);
     Func->addFnAttr(Attribute::WillReturn);
+    for (llvm::Argument &Arg : Func->args())
+      if (Arg.getType()->isPointerTy())
+        Arg.addAttr(Attribute::ReadNone);
   }
 
   // Collect instructions in these containers to remove them later.

llvm-spirv/lib/SPIRV/SPIRVWriter.cpp

@@ -849,8 +849,10 @@ SPIRVFunction *LLVMToSPIRVBase::transFunctionDecl(Function *F) {
       BA->addAttr(FunctionParameterAttributeNoCapture);
     if (I->hasStructRetAttr())
       BA->addAttr(FunctionParameterAttributeSret);
-    if (I->onlyReadsMemory())
+    if (Attrs.hasParamAttr(ArgNo, Attribute::ReadOnly))
       BA->addAttr(FunctionParameterAttributeNoWrite);
+    if (Attrs.hasParamAttr(ArgNo, Attribute::ReadNone))
+      BA->addAttr(FunctionParameterAttributeNoReadWrite);
     if (Attrs.hasParamAttr(ArgNo, Attribute::ZExt))
       BA->addAttr(FunctionParameterAttributeZext);
     if (Attrs.hasParamAttr(ArgNo, Attribute::SExt))

llvm-spirv/test/transcoding/OpGenericPtrMemSemantics.ll

@@ -24,7 +24,7 @@ target triple = "spir-unknown-unknown"
 
 @gint = addrspace(1) global i32 1, align 4
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 define spir_func i32 @isFenceValid(i32 %fence) #0 {
 entry:
   %switch = icmp ult i32 %fence, 4
@@ -66,7 +66,7 @@ entry:
 
 declare spir_func i32 @_Z13get_global_idj(i32) #2
 
-attributes #0 = { nounwind readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
 attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
 attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
 attributes #3 = { nounwind }

llvm-spirv/test/transcoding/OpImageSampleExplicitLod.ll

@@ -43,14 +43,14 @@ entry:
 ; Function Attrs: nounwind
 declare spir_func float @_Z11read_imagef20ocl_image2d_depth_ro11ocl_samplerDv2_i(%opencl.image2d_depth_ro_t addrspace(1)*, i32, <2 x i32>) #0
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func i32 @_Z13get_global_idj(i32) #1
 
 ; Function Attrs: nounwind
 declare spir_func <2 x i32> @_Z13get_image_dim20ocl_image2d_depth_ro(%opencl.image2d_depth_ro_t addrspace(1)*) #0
 
 attributes #0 = { nounwind }
-attributes #1 = { nounwind readnone }
+attributes #1 = { nounwind }
 
 !opencl.enable.FP_CONTRACT = !{}
 !opencl.spir.version = !{!6}

llvm-spirv/test/transcoding/OpSwitch32.ll

@@ -75,12 +75,12 @@ sw.epilog:                                        ; preds = %entry, %sw.bb1, %sw
   ret void
 }
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func i64 @_Z13get_global_idj(i32) #1
 
 attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #1 = { nounwind readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #2 = { nounwind readnone }
+attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind }
 
 !opencl.enable.FP_CONTRACT = !{}
 !opencl.spir.version = !{!6}

llvm-spirv/test/transcoding/OpSwitch64.ll

@@ -86,12 +86,12 @@ sw.epilog:                                        ; preds = %entry, %sw.bb3, %sw
   ret void
 }
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func i64 @_Z13get_global_idj(i32) #1
 
 attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #1 = { nounwind readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #2 = { nounwind readnone }
+attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind }
 
 !opencl.enable.FP_CONTRACT = !{}
 !opencl.spir.version = !{!6}

llvm-spirv/test/transcoding/bitcast.ll

@@ -26,12 +26,12 @@ entry:
   ret void
 }
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func i64 @_Z13get_global_idj(i32) #1
 
 attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #1 = { nounwind readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #2 = { nounwind readnone }
+attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind }
 
 !opencl.enable.FP_CONTRACT = !{}
 !opencl.spir.version = !{!6}

llvm-spirv/test/transcoding/builtin_calls.ll

@@ -16,7 +16,7 @@ target triple = "spir-unknown-unknown"
 ; CHECK-SPIRV: Variable {{[0-9]+}} [[Id:[0-9]+]]
 ; CHECK-SPIRV: Variable {{[0-9]+}} [[Id:[0-9]+]]
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 define spir_kernel void @f() #0 !kernel_arg_addr_space !0 !kernel_arg_access_qual !0 !kernel_arg_type !0 !kernel_arg_base_type !0 !kernel_arg_type_qual !0 {
 entry:
   %0 = call spir_func i32 @_Z29__spirv_BuiltInGlobalLinearIdv()

llvm-spirv/test/transcoding/builtin_function_readnone_attr.ll

@@ -1,13 +1,23 @@
 ; RUN: llvm-as %s -o %t.bc
 ; RUN: llvm-spirv %t.bc -o %t.spv
+; RUN: llvm-spirv %t.spv -to-text -o %t.spt
+; RUN: FileCheck < %t.spt %s --check-prefix=CHECK-SPIRV
 ; RUN: llvm-spirv -r -emit-opaque-pointers %t.spv -o %t.bc
 ; RUN: llvm-dis < %t.bc | FileCheck %s --check-prefix=CHECK-LLVM
 
+; CHECK-SPIRV: Name [[#A:]] "a"
+; CHECK-SPIRV: Name [[#B:]] "b"
+; CHECK-SPIRV: Decorate [[#A]] FuncParamAttr 5
+; CHECK-SPIRV: Decorate [[#A]] FuncParamAttr 6
+; CHECK-SPIRV: Decorate [[#B]] FuncParamAttr 7
+
+; CHECK-LLVM: {{.*}}void @test_builtin_readnone(ptr nocapture readonly %{{.*}}, ptr nocapture readnone %{{.*}})
+
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "spir-unknown-unknown"
 
 ; Function Attrs: convergent nofree norecurse nounwind uwtable
-define dso_local spir_kernel void @test_builtin_readnone(double* nocapture readonly %a, double* nocapture %b) local_unnamed_addr #0 !kernel_arg_addr_space !3 !kernel_arg_access_qual !4 !kernel_arg_type !5 !kernel_arg_base_type !5 !kernel_arg_type_qual !6 {
+define dso_local spir_kernel void @test_builtin_readnone(double* nocapture readonly %a, double* nocapture readnone %b) local_unnamed_addr #0 !kernel_arg_addr_space !3 !kernel_arg_access_qual !4 !kernel_arg_type !5 !kernel_arg_base_type !5 !kernel_arg_type_qual !6 {
 entry:
   %0 = load double, double* %a, align 8, !tbaa !7
   %call = tail call double @_Z3expd(double %0) #2
@@ -18,18 +28,15 @@ entry:
   ret void
 }
 
-; Function Attrs: convergent nounwind readnone
-; CHECK-LLVM: declare{{.*}}@_Z3expd{{.*}}#[[#Attrs:]]
+; Function Attrs: convergent nounwind
 declare dso_local double @_Z3expd(double) local_unnamed_addr #1
 
-; Function Attrs: convergent nounwind readnone
-; CHECK-LLVM: declare{{.*}}@_Z3cosd{{.*}}#[[#Attrs]]
+; Function Attrs: convergent nounwind
 declare dso_local double @_Z3cosd(double) local_unnamed_addr #1
 
 attributes #0 = { convergent nofree norecurse nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "uniform-work-group-size"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
-; CHECK-LLVM: attributes #[[#Attrs]] {{.*}} readnone
-attributes #1 = { convergent nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #2 = { convergent nounwind readnone }
+attributes #1 = { convergent nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { convergent nounwind }
 
 !llvm.module.flags = !{!0}
 !opencl.ocl.version = !{!1}

llvm-spirv/test/transcoding/builtin_vars_arithmetics.ll

@@ -123,7 +123,7 @@ entry:
 
 attributes #0 = { norecurse "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "sycl-module-id"="test.cpp" "uniform-work-group-size"="true" "unsafe-fp-math"="false" "use-soft-float"="false" }
 
-; CHECK-LLVM-OCL: attributes #1 = { nounwind readnone willreturn }
+; CHECK-LLVM-OCL: attributes #1 = { nounwind willreturn }
 
 !llvm.module.flags = !{!0}
 !opencl.spir.version = !{!1}

llvm-spirv/test/transcoding/isequal.ll

@@ -30,15 +30,15 @@ entry:
   ret void
 }
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func i64 @_Z13get_global_idj(i32) #1
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func <8 x i32> @_Z7isequalDv8_fDv8_f(<8 x float>, <8 x float>) #1
 
 attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #1 = { nounwind readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #2 = { nounwind readnone }
+attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind }
 
 !opencl.enable.FP_CONTRACT = !{}
 !opencl.spir.version = !{!6}

llvm-spirv/test/transcoding/unreachable.ll

@@ -30,11 +30,11 @@ define spir_kernel void @unreachable_simple(i32 addrspace(1)* nocapture %in, i32
   ret void
 }
 
-; Function Attrs: nounwind readnone
+; Function Attrs: nounwind
 declare spir_func i64 @_Z13get_global_idj(i32) #1
 
 attributes #0 = { nounwind }
-attributes #1 = { nounwind readnone }
+attributes #1 = { nounwind }
 
 !opencl.enable.FP_CONTRACT = !{}
 !spirv.Source = !{!6}