[llvm] [MC][LoongArch] Change default cpu in `MCSubtargetInfo`. (PR #114922)

[Zhaoxin Yang via llvm-commits]

https://github.com/ylzsx created https://github.com/llvm/llvm-project/pull/114922

The default value of this CPU affects the `FeatureBits` obtained by `LoongArchTargetELFStreamer` when creating an ELF file, and it will further affect the `Flags` field in the generated file.

So, the default CPU value should be consistent with the `initializeSubtargetDependencies` in `LoongArchSubtarget.cpp`. Otherwise, the `Flags` field may be unexpected.

>From ac62c81fdf5f91e70a35d8bcfa2bcadaf270a64a Mon Sep 17 00:00:00 2001
From: ylzsx <2375355630 at qq.com>
Date: Sat, 2 Nov 2024 17:22:37 +0800
Subject: [PATCH] [MC][LoongArch] Change default cpu in `MCSubtargetInfo`.

The default value of this CPU affects the `FeatureBits` obtained
by `LoongArchTargetELFStreamer` when creating an ELF file, and it
will further affect the `Flags` field in the generated file.

So, the default CPU value should be consistent with the
`initializeSubtargetDependencies` in `LoongArchSubtarget.cpp`.
Otherwise, the `Flags` field may be unexpected.
---
 .../Target/LoongArch/MCTargetDesc/LoongArchMCTargetDesc.cpp | 2 +-
 llvm/test/CodeGen/LoongArch/e_flags.ll                      | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCTargetDesc.cpp b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCTargetDesc.cpp
index 62e900dc65babb..1d4b73d1b7f27a 100644
--- a/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCTargetDesc.cpp
+++ b/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCTargetDesc.cpp
@@ -55,7 +55,7 @@ static MCInstrInfo *createLoongArchMCInstrInfo() {
 static MCSubtargetInfo *
 createLoongArchMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS) {
   if (CPU.empty() || CPU == "generic")
-    CPU = TT.isArch64Bit() ? "la464" : "generic-la32";
+    CPU = TT.isArch64Bit() ? "generic-la64" : "generic-la32";
   return createLoongArchMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, FS);
 }
 
diff --git a/llvm/test/CodeGen/LoongArch/e_flags.ll b/llvm/test/CodeGen/LoongArch/e_flags.ll
index 2feb9d832bca9a..5d2aa9695b21ae 100644
--- a/llvm/test/CodeGen/LoongArch/e_flags.ll
+++ b/llvm/test/CodeGen/LoongArch/e_flags.ll
@@ -1,3 +1,6 @@
+; RUN: llc --mtriple=loongarch32 --filetype=obj %s -o %t-la32s
+; RUN: llvm-readelf -h %t-la32s | FileCheck %s --check-prefixes=ILP32,ABI-S --match-full-lines
+
 ; RUN: llc --mtriple=loongarch32 -mattr=+d --filetype=obj %s -o %t-la32
 ; RUN: llvm-readelf -h %t-la32 | FileCheck %s --check-prefixes=ILP32,ABI-D --match-full-lines
 
@@ -10,6 +13,9 @@
 ; RUN: llc --mtriple=loongarch32 -mattr=+d --filetype=obj %s --target-abi=ilp32d -o %t-ilp32d
 ; RUN: llvm-readelf -h %t-ilp32d | FileCheck %s --check-prefixes=ILP32,ABI-D --match-full-lines
 
+; RUN: llc --mtriple=loongarch64 --filetype=obj %s -o %t-la64d
+; RUN: llvm-readelf -h %t-la64d | FileCheck %s --check-prefixes=LP64,ABI-D --match-full-lines
+
 ; RUN: llc --mtriple=loongarch64 -mattr=+d --filetype=obj %s -o %t-la64
 ; RUN: llvm-readelf -h %t-la64 | FileCheck %s --check-prefixes=LP64,ABI-D --match-full-lines