[llvm] [BPF] use target triple for pattern predicates (PR #74998)

[Yingchi Long via llvm-commits]

https://github.com/inclyc created https://github.com/llvm/llvm-project/pull/74998

This is used for eliminate uses of "CurDAG", which is SelectionDAG-spec, and not compatible with GIsel algorithms.

(NFC)

>From 75bf5ff5f57d8b9e1127b4cba86d372e22a8c04d Mon Sep 17 00:00:00 2001
From: Yingchi Long <i at lyc.dev>
Date: Sun, 10 Dec 2023 21:14:43 +0800
Subject: [PATCH] [BPF] use target triple for pattern predicates

This is used for eliminate uses of "CurDAG", which is
SelectionDAG-spec, and not compatible with GIsel algorithms.
---
 llvm/lib/Target/BPF/BPFInstrInfo.td  | 4 ++--
 llvm/lib/Target/BPF/BPFSubtarget.cpp | 4 +++-
 llvm/lib/Target/BPF/BPFSubtarget.h   | 4 ++++
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Target/BPF/BPFInstrInfo.td b/llvm/lib/Target/BPF/BPFInstrInfo.td
index 5972c9d49c5151..7d443a34490146 100644
--- a/llvm/lib/Target/BPF/BPFInstrInfo.td
+++ b/llvm/lib/Target/BPF/BPFInstrInfo.td
@@ -49,8 +49,8 @@ def BPFWrapper      : SDNode<"BPFISD::Wrapper", SDT_BPFWrapper>;
 def BPFmemcpy       : SDNode<"BPFISD::MEMCPY", SDT_BPFMEMCPY,
                              [SDNPHasChain, SDNPInGlue, SDNPOutGlue,
                               SDNPMayStore, SDNPMayLoad]>;
-def BPFIsLittleEndian : Predicate<"CurDAG->getDataLayout().isLittleEndian()">;
-def BPFIsBigEndian    : Predicate<"!CurDAG->getDataLayout().isLittleEndian()">;
+def BPFIsLittleEndian : Predicate<"Subtarget->isLittleEndian()">;
+def BPFIsBigEndian    : Predicate<"!Subtarget->isLittleEndian()">;
 def BPFHasALU32 : Predicate<"Subtarget->getHasAlu32()">;
 def BPFNoALU32 : Predicate<"!Subtarget->getHasAlu32()">;
 def BPFHasLdsx : Predicate<"Subtarget->hasLdsx()">;
diff --git a/llvm/lib/Target/BPF/BPFSubtarget.cpp b/llvm/lib/Target/BPF/BPFSubtarget.cpp
index ce02c831828e4d..5e79142ea9e1c8 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.cpp
+++ b/llvm/lib/Target/BPF/BPFSubtarget.cpp
@@ -93,4 +93,6 @@ BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
                            const std::string &FS, const TargetMachine &TM)
     : BPFGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS),
       FrameLowering(initializeSubtargetDependencies(CPU, FS)),
-      TLInfo(TM, *this) {}
+      TLInfo(TM, *this) {
+  IsLittleEndian = TT.isLittleEndian();
+}
diff --git a/llvm/lib/Target/BPF/BPFSubtarget.h b/llvm/lib/Target/BPF/BPFSubtarget.h
index 6e81daa4d955e0..a55ae618f4d1d3 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.h
+++ b/llvm/lib/Target/BPF/BPFSubtarget.h
@@ -43,6 +43,8 @@ class BPFSubtarget : public BPFGenSubtargetInfo {
   // unused
   bool isDummyMode;
 
+  bool IsLittleEndian;
+
   // whether the cpu supports jmp ext
   bool HasJmpExt;
 
@@ -81,6 +83,8 @@ class BPFSubtarget : public BPFGenSubtargetInfo {
   bool hasGotol() const { return HasGotol; }
   bool hasStoreImm() const { return HasStoreImm; }
 
+  bool isLittleEndian() const { return IsLittleEndian; }
+
   const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
   const BPFFrameLowering *getFrameLowering() const override {
     return &FrameLowering;