[llvm] [X86] Add slow div64/lea3 tuning flags to Nehalem target (PR #91129)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon updated https://github.com/llvm/llvm-project/pull/91129

>From fa148651bb735970c3241156718132f66af07473 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev at redking.me.uk>
Date: Sun, 5 May 2024 16:44:25 +0100
Subject: [PATCH] [X86] Add slow div643 tuning flags to Nehalem target

This appears to have been missed because later cpus don't inherit from Nehalem tuning much.

Noticed while cleaning up for #90985
---
 llvm/lib/Target/X86/X86.td                       | 1 +
 llvm/test/CodeGen/X86/bypass-slow-division-64.ll | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/X86/X86.td b/llvm/lib/Target/X86/X86.td
index 78bc043911f2fc..9e731947893de9 100644
--- a/llvm/lib/Target/X86/X86.td
+++ b/llvm/lib/Target/X86/X86.td
@@ -873,6 +873,7 @@ def ProcessorFeatures {
   // Nehalem
   list<SubtargetFeature> NHMFeatures = X86_64V2Features;
   list<SubtargetFeature> NHMTuning = [TuningMacroFusion,
+                                      TuningSlowDivide64,
                                       TuningInsertVZEROUPPER,
                                       TuningNoDomainDelayMov];
 
diff --git a/llvm/test/CodeGen/X86/bypass-slow-division-64.ll b/llvm/test/CodeGen/X86/bypass-slow-division-64.ll
index 4aaeab4f2f130a..66d7082d9b7c55 100644
--- a/llvm/test/CodeGen/X86/bypass-slow-division-64.ll
+++ b/llvm/test/CodeGen/X86/bypass-slow-division-64.ll
@@ -7,7 +7,7 @@
 ; RUN: llc < %s -mtriple=x86_64-- -mcpu=x86-64-v3       | FileCheck %s --check-prefixes=CHECK,SLOW-DIVQ
 ; RUN: llc < %s -mtriple=x86_64-- -mcpu=x86-64-v4       | FileCheck %s --check-prefixes=CHECK,SLOW-DIVQ
 ; Intel
-; RUN: llc < %s -mtriple=x86_64-- -mcpu=nehalem         | FileCheck %s --check-prefixes=CHECK,FAST-DIVQ
+; RUN: llc < %s -mtriple=x86_64-- -mcpu=nehalem         | FileCheck %s --check-prefixes=CHECK,SLOW-DIVQ
 ; RUN: llc < %s -mtriple=x86_64-- -mcpu=sandybridge     | FileCheck %s --check-prefixes=CHECK,SLOW-DIVQ
 ; RUN: llc < %s -mtriple=x86_64-- -mcpu=haswell         | FileCheck %s --check-prefixes=CHECK,SLOW-DIVQ
 ; RUN: llc < %s -mtriple=x86_64-- -mcpu=skylake         | FileCheck %s --check-prefixes=CHECK,SLOW-DIVQ