[PATCH] D134712: [LoongArch] Override TargetSubtargetInfo::getSelectionDAGInfo

[Ray Wang via Phabricator via llvm-commits]

wangleiat created this revision.
wangleiat added reviewers: SixWeining, xen0n, xry111, gonglingqin, MaskRay.
Herald added subscribers: StephenFan, hiraditya.
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The target selection DAG lowering information is needed for
SelectionDAGBuilder to lower a call like memcmp into an optimized
form.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134712

Files:
  llvm/lib/Target/LoongArch/LoongArchSubtarget.h
  llvm/test/CodeGen/LoongArch/memcmp.ll


Index: llvm/test/CodeGen/LoongArch/memcmp.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/LoongArch/memcmp.ll
@@ -0,0 +1,24 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc --mtriple=loongarch64 < %s | FileCheck %s
+
+;; Before getSelectionDAGInfo() interface hooks were defined DAGBuilder
+;; would crash.
+
+define signext i32 @test1(ptr %buffer1, ptr %buffer2) {
+; CHECK-LABEL: test1:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    addi.d $sp, $sp, -16
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    st.d $ra, $sp, 8 # 8-byte Folded Spill
+; CHECK-NEXT:    .cfi_offset 1, -8
+; CHECK-NEXT:    ori $a2, $zero, 16
+; CHECK-NEXT:    bl %plt(memcmp)
+; CHECK-NEXT:    ld.d $ra, $sp, 8 # 8-byte Folded Reload
+; CHECK-NEXT:    addi.d $sp, $sp, 16
+; CHECK-NEXT:    ret
+entry:
+  %call = call signext i32 @memcmp(ptr %buffer1, ptr %buffer2, i64 16)
+  ret i32 %call
+}
+
+declare signext i32 @memcmp(ptr, ptr, i64)
Index: llvm/lib/Target/LoongArch/LoongArchSubtarget.h
===================================================================
--- llvm/lib/Target/LoongArch/LoongArchSubtarget.h
+++ llvm/lib/Target/LoongArch/LoongArchSubtarget.h
@@ -45,6 +45,7 @@
   LoongArchInstrInfo InstrInfo;
   LoongArchRegisterInfo RegInfo;
   LoongArchTargetLowering TLInfo;
+  SelectionDAGTargetInfo TSInfo;
 
   /// Initializes using the passed in CPU and feature strings so that we can
   /// use initializer lists for subtarget initialization.
@@ -73,6 +74,9 @@
   const LoongArchTargetLowering *getTargetLowering() const override {
     return &TLInfo;
   }
+  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
+    return &TSInfo;
+  }
   bool is64Bit() const { return HasLA64; }
   bool hasBasicF() const { return HasBasicF; }
   bool hasBasicD() const { return HasBasicD; }


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