AMDGPU: Fix crashes on memory functions

[• tstellarAMD]

LGTM.

[arsenm]

r278369

lib/Target/AMDGPU/AMDGPUSubtarget.h

 #include "R600InstrInfo.h"
 #include "R600ISelLowering.h"
 #include "R600FrameLowering.h"
 #include "SIInstrInfo.h"
 #include "SIISelLowering.h"
 #include "SIFrameLowering.h"
 #include "Utils/AMDGPUBaseInfo.h"
 #include "llvm/CodeGen/GlobalISel/GISelAccessor.h"
+#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
 #include "llvm/Target/TargetSubtargetInfo.h"
 
 #define GET_SUBTARGETINFO_HEADER
 #include "AMDGPUGenSubtargetInfo.inc"
 
 namespace llvm {
 
 class SIMachineFunctionInfo;
protected:
   bool CFALUBug;
   bool HasVertexCache;
   short TexVTXClauseSize;
 
   // Dummy feature to use for assembler in tablegen.
   bool FeatureDisable;
 
   InstrItineraryData InstrItins;
+  SelectionDAGTargetInfo TSInfo;
 
 public:
   AMDGPUSubtarget(const Triple &TT, StringRef GPU, StringRef FS,
                   const TargetMachine &TM);
   virtual ~AMDGPUSubtarget();
   AMDGPUSubtarget &initializeSubtargetDependencies(const Triple &TT,
                                                    StringRef GPU, StringRef FS);
 
   const AMDGPUInstrInfo *getInstrInfo() const override = 0;
   const AMDGPUFrameLowering *getFrameLowering() const override = 0;
   const AMDGPUTargetLowering *getTargetLowering() const override = 0;
   const AMDGPURegisterInfo *getRegisterInfo() const override = 0;
 
   const InstrItineraryData *getInstrItineraryData() const override {
     return &InstrItins;
   }
 
+  // Nothing implemented, just prevent crashes on use.
+  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
+    return &TSInfo;
+  }
+
   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
 
   bool isAmdHsaOS() const {
     return TargetTriple.getOS() == Triple::AMDHSA;
   }
 
   Generation getGeneration() const {
     return Gen;

lib/Target/AMDGPU/AMDGPUSubtarget.cpp

: AMDGPUGenSubtargetInfo(TT, GPU, FS),
 
     R600ALUInst(false),
     CaymanISA(false),
     CFALUBug(false),
     HasVertexCache(false),
     TexVTXClauseSize(0),
 
     FeatureDisable(false),
-    InstrItins(getInstrItineraryForCPU(GPU)) {
+    InstrItins(getInstrItineraryForCPU(GPU)),
+    TSInfo() {
   initializeSubtargetDependencies(TT, GPU, FS);
 }
 
 // FIXME: These limits are for SI. Did they change with the larger maximum LDS
 // size?
 unsigned AMDGPUSubtarget::getMaxLocalMemSizeWithWaveCount(unsigned NWaves) const {
   switch (NWaves) {
   case 10:

test/CodeGen/AMDGPU/mem-builtins.ll

+; RUN: not llc -march=amdgcn -verify-machineinstrs < %s 2>&1 | FileCheck -check-prefix=ERROR %s
+
+declare i32 @memcmp(i8 addrspace(1)* readonly nocapture, i8 addrspace(1)* readonly nocapture, i64) #0
+declare i8 addrspace(1)* @memchr(i8 addrspace(1)* readonly nocapture, i32, i64) #1
+declare i8* @strcpy(i8* nocapture, i8* readonly nocapture) #0
+declare i32 @strlen(i8* nocapture) #1
+declare i32 @strnlen(i8* nocapture, i32) #1
+declare i32 @strcmp(i8* nocapture, i8* nocapture) #1
+
+
+; ERROR: error: <unknown>:0:0: in function test_memcmp void (i8 addrspace(1)*, i8 addrspace(1)*, i32*): unsupported call to function memcmp
+define void @test_memcmp(i8 addrspace(1)* %x, i8 addrspace(1)* %y, i32* nocapture %p) #0 {
+entry:
+  %cmp = tail call i32 @memcmp(i8 addrspace(1)* %x, i8 addrspace(1)* %y, i64 2)
+  store volatile i32 %cmp, i32 addrspace(1)* undef
+  ret void
+}
+
+; ERROR: error: <unknown>:0:0: in function test_memchr void (i8 addrspace(1)*, i32, i64): unsupported call to function memchr
+define void @test_memchr(i8 addrspace(1)* %src, i32 %char, i64 %len) #0 {
+  %res = call i8 addrspace(1)* @memchr(i8 addrspace(1)* %src, i32 %char, i64 %len)
+  store volatile i8 addrspace(1)* %res, i8 addrspace(1)* addrspace(1)* undef
+  ret void
+}
+
+; ERROR: error: <unknown>:0:0: in function test_strcpy void (i8*, i8*): unsupported call to function strcpy
+define void @test_strcpy(i8* %dst, i8* %src) #0 {
+  %res = call i8* @strcpy(i8* %dst, i8* %src)
+  store volatile i8* %res, i8* addrspace(1)* undef
+  ret void
+}
+
+; ERROR: error: <unknown>:0:0: in function test_strcmp void (i8*, i8*): unsupported call to function strcmp
+define void @test_strcmp(i8* %src0, i8* %src1) #0 {
+  %res = call i32 @strcmp(i8* %src0, i8* %src1)
+  store volatile i32 %res, i32 addrspace(1)* undef
+  ret void
+}
+
+; ERROR: error: <unknown>:0:0: in function test_strlen void (i8*): unsupported call to function strlen
+define void @test_strlen(i8* %src) #0 {
+  %res = call i32 @strlen(i8* %src)
+  store volatile i32 %res, i32 addrspace(1)* undef
+  ret void
+}
+
+; ERROR: error: <unknown>:0:0: in function test_strnlen void (i8*, i32): unsupported call to function strnlen
+define void @test_strnlen(i8* %src, i32 %size) #0 {
+  %res = call i32 @strnlen(i8* %src, i32 %size)
+  store volatile i32 %res, i32 addrspace(1)* undef
+  ret void
+}
+
+attributes #0 = { nounwind }