[llvm] [GlobalIsel] Combine G_PTR_ADD. (PR #95647)

[Pierre van Houtryve via llvm-commits]

Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>,
Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/95647 at github.com>


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@@ -7437,3 +7437,212 @@ bool CombinerHelper::matchNonNegZext(const MachineOperand &MO,
 
   return false;
 }
+
+bool CombinerHelper::matchPtrAddWithSub(const MachineOperand &MO,
+                                        BuildFnTy &MatchInfo) {
+  GPtrAdd *Inner = cast<GPtrAdd>(MRI.getVRegDef(MO.getReg()));
+  GSub *Sub = cast<GSub>(MRI.getVRegDef(Inner->getOffsetReg()));
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Pierre-vh wrote:

You can just pass the MI directly from the combine rule by giving a name to the pattern and using that in C++
Same for all other patterns below

https://github.com/llvm/llvm-project/pull/95647