[llvm] [PowerPC] Avoid repeated hash lookups (NFC) (PR #131724)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/131724

None

>From 9d312c049acee8806347f2b441abf7fbef6a2572 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Mon, 17 Mar 2025 09:01:05 -0700
Subject: [PATCH] [PowerPC] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Target/PowerPC/PPCFrameLowering.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
index f62434d57dcd3..429994e09cc5c 100644
--- a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
@@ -2489,22 +2489,23 @@ bool PPCFrameLowering::spillCalleeSavedRegisters(
         if (Spilled[Dst])
           continue;
 
-        if (VSRContainingGPRs[Dst].second != 0) {
+        auto &VSR = VSRContainingGPRs[Dst];
+        if (VSR.second != 0) {
           assert(Subtarget.hasP9Vector() &&
                  "mtvsrdd is unavailable on pre-P9 targets.");
 
           NumPESpillVSR += 2;
           BuildMI(MBB, MI, DL, TII.get(PPC::MTVSRDD), Dst)
-              .addReg(VSRContainingGPRs[Dst].first, getKillRegState(true))
-              .addReg(VSRContainingGPRs[Dst].second, getKillRegState(true));
-        } else if (VSRContainingGPRs[Dst].second == 0) {
+              .addReg(VSR.first, getKillRegState(true))
+              .addReg(VSR.second, getKillRegState(true));
+        } else if (VSR.second == 0) {
           assert(Subtarget.hasP8Vector() &&
                  "Can't move GPR to VSR on pre-P8 targets.");
 
           ++NumPESpillVSR;
           BuildMI(MBB, MI, DL, TII.get(PPC::MTVSRD),
                   TRI->getSubReg(Dst, PPC::sub_64))
-              .addReg(VSRContainingGPRs[Dst].first, getKillRegState(true));
+              .addReg(VSR.first, getKillRegState(true));
         } else {
           llvm_unreachable("More than two GPRs spilled to a VSR!");
         }