[RISCV][TTI] Simplify compound check for readability [nfc]

[preames]

I misread this check earlier today on a review, so restructure it to be easier to quickly scan.

[llvmbot]

@llvm/pr-subscribers-backend-risc-v

Author: Philip Reames (preames)

Changes

I misread this check earlier today on a review, so restructure it to be easier to quickly scan.

---

Full diff: https://github.com/llvm/llvm-project/pull/121504.diff

1 Files Affected:

• (modified) llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp (+4-2)

diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
index 0abb270edcabc8..13500381305168 100644
--- a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
@@ -2558,8 +2558,10 @@ RISCVTTIImpl::enableMemCmpExpansion(bool OptSize, bool IsZeroCmp) const {
   TTI::MemCmpExpansionOptions Options;
   // TODO: Enable expansion when unaligned access is not supported after we fix
   // issues in ExpandMemcmp.
-  if (!(ST->enableUnalignedScalarMem() &&
-        (ST->hasStdExtZbb() || ST->hasStdExtZbkb() || IsZeroCmp)))
+  if (!ST->enableUnalignedScalarMem())
+    return Options;
+
+  if (!(ST->hasStdExtZbb() || ST->hasStdExtZbkb() || IsZeroCmp))
     return Options;
 
   Options.AllowOverlappingLoads = true;

[topperc]

deMorgan this?

[wangpc-pp]

LGTM. Thanks!