Revert "[X86] Use generic CPU tuning when tune-cpu is empty"

[phoebewang]

Reverts #83631

Using HasX86_64 is incorrect.

[llvmbot]

@llvm/pr-subscribers-backend-x86

Author: Phoebe Wang (phoebewang)

Changes

Reverts llvm/llvm-project#83631

Using HasX86_64 is incorrect.

---

Full diff: https://github.com/llvm/llvm-project/pull/93436.diff

1 Files Affected:

• (modified) llvm/lib/Target/X86/X86Subtarget.cpp (+1-1)

diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
index bac8d3a29ec06..c2e6ddd7e7fa2 100644
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -252,7 +252,7 @@ void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef TuneCPU,
     CPU = "generic";
 
   if (TuneCPU.empty())
-    TuneCPU = HasX86_64 ? "generic" : "i586";
+    TuneCPU = "i586"; // FIXME: "generic" is more modern than llc tests expect.
 
   std::string FullFS = X86_MC::ParseX86Triple(TargetTriple);
   assert(!FullFS.empty() && "Failed to parse X86 triple");