[llvm] [GlobalIsel] Combine freeze (PR #93239)

[Dhruv Chawla via llvm-commits]

Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>,
Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>,
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/93239 at github.com>


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@@ -361,8 +361,8 @@ body:             |
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: %vec:_(<2 x s64>) = COPY $q0
     ; CHECK-NEXT: %idx:_(s64) = COPY $x1
-    ; CHECK-NEXT: [[EVEC:%[0-9]+]]:_(s64) = G_EXTRACT_VECTOR_ELT %vec(<2 x s64>), %idx(s64)
-    ; CHECK-NEXT: %extract:_(s64) = G_FREEZE [[EVEC]]
+    ; CHECK-NEXT: %fvec:_(<2 x s64>) = G_FREEZE %vec
+    ; CHECK-NEXT: %extract:_(s64) = G_EXTRACT_VECTOR_ELT %fvec(<2 x s64>), %idx(s64)
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dc03-work wrote:

I would consider this to be a regression, because you're expanding the scope of the `freeze` even though its not necessary.

https://github.com/llvm/llvm-project/pull/93239