[llvm] [AMDGPU] Only reinitialize disassembler Bytes array when needed. NFC. (PR #96666)

[Jay Foad via llvm-commits]

https://github.com/jayfoad created https://github.com/llvm/llvm-project/pull/96666

None

>From 08ddbfe99e91d9b56bf7e26f128baa3a6dc6052c Mon Sep 17 00:00:00 2001
From: Jay Foad <jay.foad at amd.com>
Date: Tue, 25 Jun 2024 17:41:16 +0100
Subject: [PATCH] [AMDGPU] Only reinitialize disassembler Bytes array when
 needed. NFC.

---
 .../AMDGPU/Disassembler/AMDGPUDisassembler.cpp       | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
index 76a559c9443bd..0c0e9163fc6ef 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
@@ -494,10 +494,10 @@ DecodeStatus AMDGPUDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
       if (isGFX12() &&
           tryDecodeInst(DecoderTableGFX12W6496, MI, DecW, Address, CS))
         break;
-    }
 
-    // Reinitialize Bytes
-    Bytes = Bytes_.slice(0, MaxInstBytesNum);
+      // Reinitialize Bytes
+      Bytes = Bytes_.slice(0, MaxInstBytesNum);
+    }
 
     if (Bytes.size() >= 8) {
       const uint64_t QW = eatBytes<uint64_t>(Bytes);
@@ -552,10 +552,10 @@ DecodeStatus AMDGPUDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
       if (isGFX12() &&
           tryDecodeInst(DecoderTableGFX12W6464, MI, QW, Address, CS))
         break;
-    }
 
-    // Reinitialize Bytes
-    Bytes = Bytes_.slice(0, MaxInstBytesNum);
+      // Reinitialize Bytes
+      Bytes = Bytes_.slice(0, MaxInstBytesNum);
+    }
 
     // Try decode 32-bit instruction
     if (Bytes.size() >= 4) {