[Backport to 12][OpaquePointers] Handle llvm.memset intrinsic manglin…

…g mismatches (#2185)

Original change:
bdd7652

Non-constant @llvm.memset calls are presently lowered by generating
synthetic functions with the mangled name of memset. However, the reader
tries to use this name to generate the intrinsic call again. This causes
verification issues if the SPIRVWriter and SPIRVReader do not agree on
whether or not to use opaque pointers. This change uses the actual type
of the function (which will take into account whether or not it is in
opaque pointer mode) to generate the LLVM intrinsic name, fixing the
mismatch issues.

lib/SPIRV/SPIRVReader.cpp

@@ -2608,6 +2608,15 @@ Function *SPIRVToLLVM::transFunction(SPIRVFunction *BF) {
   // assuming llvm.memset is supported by the device compiler. If this
   // assumption is not safe, we should have a command line option to control
   // this behavior.
+  if (FuncNameRef.startswith("spirv.llvm_memset_p")) {
+    // We can't guarantee that the name is correctly mangled due to opaque
+    // pointers. Derive the correct name from the function type.
+    FuncName =
+        Intrinsic::getDeclaration(M, Intrinsic::memset,
+                                  {FT->getParamType(0), FT->getParamType(2)})
+            ->getName()
+            .str();
+  }
   if (FuncNameRef.consume_front("spirv.")) {
     FuncNameRef.consume_back(".volatile");
     FuncName = FuncNameRef.str();

test/llvm-intrinsics/memset-opaque.spt

@@ -0,0 +1,239 @@
+; RUN: llvm-spirv %s -to-binary -o %t.spv
+; RUN: llvm-spirv -r %t.spv -o %t.bc
+; RUN: llvm-dis < %t.bc | FileCheck %s --check-prefix=CHECK-LLVM
+
+; Verify that the reverse translation works correctly and converts opaque-type generated intrinsics
+; (like 'spirv.llvm_memset_p0_i32') to the typed-pointer signatures (like to '@llvm.memset.p0i8.i32').
+
+; CHECK-LLVM: call void @llvm.memset.p4i8.i32(i8 addrspace(4)* align 4 %1, i8 0, i32 12, i1 false)
+; CHECK-LLVM: call void @llvm.memcpy.p0i8.p2i8.i32(i8* align 4 %3, i8 addrspace(2)* align 4 %4, i32 4, i1 false)
+; CHECK-LLVM: call void @llvm.memset.p0a4i8.i32([4 x i8]* %x, i8 %v, i32 3, i1 false)
+; CHECK-LLVM: call void @llvm.memset.p0a4i8.i32([4 x i8]* %x, i8 %v, i32 %s1, i1 false)
+; CHECK-LLVM: call void @llvm.memset.p3s_struct.S1s.i32(%struct.S1 addrspace(3)* %a, i8 %v, i32 %s1, i1 false)
+; CHECK-LLVM: call void @llvm.memset.p1s_struct.S1s.i64(%struct.S1 addrspace(1)* %b, i8 %v, i64 %s2, i1 false)
+; CHECK-LLVM: call void @llvm.memset.p1s_struct.S1s.i64(%struct.S1 addrspace(1)* %b, i8 %v, i64 %s2, i1 true)
+
+119734787 65536 393230 117 0
+2 Capability Addresses
+2 Capability Linkage
+2 Capability Kernel
+2 Capability Int64
+2 Capability GenericPointer
+2 Capability Int8
+5 ExtInstImport 1 "OpenCL.std"
+3 MemoryModel 1 2
+3 Source 4 202000
+5 Name 3 "struct.S1"
+5 Name 9 "_Z5foo11v"
+5 Name 10 "agg.result"
+3 Name 11 "s1"
+3 Name 12 "s2"
+3 Name 13 "v"
+3 Name 18 "x"
+9 Name 39 "spirv.llvm_memset_p0_i32"
+4 Name 40 "dest"
+3 Name 41 "val"
+3 Name 42 "len"
+5 Name 43 "isvolatile"
+3 Name 47 "a"
+9 Name 49 "spirv.llvm_memset_p3_i32"
+4 Name 50 "dest"
+3 Name 51 "val"
+3 Name 52 "len"
+5 Name 53 "isvolatile"
+3 Name 56 "b"
+9 Name 58 "spirv.llvm_memset_p1_i64"
+4 Name 59 "dest"
+3 Name 60 "val"
+3 Name 61 "len"
+5 Name 62 "isvolatile"
+11 Name 65 "spirv.llvm_memset_p1_i64.volatile"
+4 Name 66 "dest"
+3 Name 67 "val"
+3 Name 68 "len"
+5 Name 69 "isvolatile"
+4 Name 71 "entry"
+6 Name 72 "loadstoreloop"
+4 Name 73 "split"
+4 Name 83 "entry"
+6 Name 84 "loadstoreloop"
+4 Name 85 "split"
+4 Name 94 "entry"
+6 Name 95 "loadstoreloop"
+4 Name 96 "split"
+4 Name 107 "entry"
+6 Name 108 "loadstoreloop"
+4 Name 109 "split"
+7 Decorate 9 LinkageAttributes "_Z5foo11v" Export
+4 Decorate 10 FuncParamAttr 4
+4 Decorate 10 FuncParamAttr 5
+4 Decorate 10 FuncParamAttr 3
+4 Decorate 18 Alignment 1
+3 Decorate 25 Constant
+3 Decorate 33 Constant
+11 Decorate 39 LinkageAttributes "spirv.llvm_memset_p0_i32" Export
+11 Decorate 49 LinkageAttributes "spirv.llvm_memset_p3_i32" Export
+11 Decorate 58 LinkageAttributes "spirv.llvm_memset_p1_i64" Export
+13 Decorate 65 LinkageAttributes "spirv.llvm_memset_p1_i64.volatile" Export
+4 TypeInt 4 32 0
+4 TypeInt 6 64 0
+4 TypeInt 7 8 0
+4 Constant 4 15 4
+4 Constant 4 21 12
+4 Constant 7 30 21
+4 Constant 4 35 3
+4 Constant 4 74 0
+4 Constant 4 80 1
+5 Constant 6 97 0 0
+5 Constant 6 104 1 0
+2 TypeVoid 2
+5 TypeStruct 3 4 4 4
+
+4 TypePointer 5 8 3
+7 TypeFunction 8 2 5 4 6 7
+4 TypeArray 16 7 15
+4 TypePointer 17 7 16
+4 TypePointer 19 8 7
+4 TypeArray 22 7 21
+4 TypePointer 24 0 22
+4 TypePointer 26 0 7
+4 TypePointer 28 7 7
+4 TypePointer 32 0 16
+2 TypeBool 36
+7 TypeFunction 38 2 17 7 4 36
+4 TypePointer 46 4 3
+7 TypeFunction 48 2 46 7 4 36
+4 TypePointer 55 5 3
+7 TypeFunction 57 2 55 7 6 36
+4 TypePointer 89 4 7
+4 TypePointer 101 5 7
+3 ConstantNull 22 23
+5 Variable 24 25 0 23
+7 ConstantComposite 16 31 30 30 30 30
+
+5 Variable 32 33 0 31
+3 ConstantFalse 36 37
+3 ConstantTrue 36 64
+
+
+5 Function 2 9 0 8
+3 FunctionParameter 5 10
+3 FunctionParameter 4 11
+3 FunctionParameter 6 12
+3 FunctionParameter 7 13
+
+2 Label 14
+4 Variable 17 18 7
+4 Bitcast 19 20 10
+4 Bitcast 26 27 25
+6 CopyMemorySized 20 27 21 2 4
+4 Bitcast 28 29 18
+4 Bitcast 26 34 33
+6 CopyMemorySized 29 34 15 2 4
+8 FunctionCall 2 44 39 18 13 35 37
+8 FunctionCall 2 45 39 18 13 11 37
+4 GenericCastToPtr 46 47 10
+8 FunctionCall 2 54 49 47 13 11 37
+4 GenericCastToPtr 55 56 10
+8 FunctionCall 2 63 58 56 13 12 37
+8 FunctionCall 2 70 65 56 13 12 64
+1 Return
+
+1 FunctionEnd
+
+5 Function 2 39 0 38
+3 FunctionParameter 17 40
+3 FunctionParameter 7 41
+3 FunctionParameter 4 42
+3 FunctionParameter 36 43
+
+2 Label 71
+5 IEqual 36 75 74 42
+4 BranchConditional 75 73 72
+
+2 Label 72
+7 Phi 4 77 74 71 76 72
+4 Bitcast 28 78 40
+5 InBoundsPtrAccessChain 28 79 78 77
+5 Store 79 41 2 1
+5 IAdd 4 76 77 80
+5 ULessThan 36 82 76 42
+4 BranchConditional 82 72 73
+
+2 Label 73
+1 Return
+
+1 FunctionEnd
+
+5 Function 2 49 0 48
+3 FunctionParameter 46 50
+3 FunctionParameter 7 51
+3 FunctionParameter 4 52
+3 FunctionParameter 36 53
+
+2 Label 83
+5 IEqual 36 86 74 52
+4 BranchConditional 86 85 84
+
+2 Label 84
+7 Phi 4 88 74 83 87 84
+4 Bitcast 89 90 50
+5 InBoundsPtrAccessChain 89 91 90 88
+5 Store 91 51 2 1
+5 IAdd 4 87 88 80
+5 ULessThan 36 93 87 52
+4 BranchConditional 93 84 85
+
+2 Label 85
+1 Return
+
+1 FunctionEnd
+
+5 Function 2 58 0 57
+3 FunctionParameter 55 59
+3 FunctionParameter 7 60
+3 FunctionParameter 6 61
+3 FunctionParameter 36 62
+
+2 Label 94
+5 IEqual 36 98 97 61
+4 BranchConditional 98 96 95
+
+2 Label 95
+7 Phi 6 100 97 94 99 95
+4 Bitcast 101 102 59
+5 InBoundsPtrAccessChain 101 103 102 100
+5 Store 103 60 2 1
+5 IAdd 6 99 100 104
+5 ULessThan 36 106 99 61
+4 BranchConditional 106 95 96
+
+2 Label 96
+1 Return
+
+1 FunctionEnd
+
+5 Function 2 65 0 57
+3 FunctionParameter 55 66
+3 FunctionParameter 7 67
+3 FunctionParameter 6 68
+3 FunctionParameter 36 69
+
+2 Label 107
+5 IEqual 36 110 97 68
+4 BranchConditional 110 109 108
+
+2 Label 108
+7 Phi 6 112 97 107 111 108
+4 Bitcast 101 113 66
+5 InBoundsPtrAccessChain 101 114 113 112
+5 Store 114 67 3 1
+5 IAdd 6 111 112 104
+5 ULessThan 36 116 111 68
+4 BranchConditional 116 108 109
+
+2 Label 109
+1 Return
+
+1 FunctionEnd
+