[llvm-branch-commits] [llvm] AMDGPU/GlobalISel: add RegBankLegalize rules for extends and trunc (PR #132383)

[Nicolai Hähnle via llvm-branch-commits]

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@@ -13,7 +12,8 @@ body: |
     ; CHECK: liveins: $sgpr0
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:sgpr(s32) = COPY $sgpr0
-    ; CHECK-NEXT: [[ANYEXT:%[0-9]+]]:sgpr(s64) = G_ANYEXT [[COPY]](s32)
+    ; CHECK-NEXT: [[DEF:%[0-9]+]]:sgpr(s32) = G_IMPLICIT_DEF
+    ; CHECK-NEXT: [[MV:%[0-9]+]]:sgpr(s64) = G_MERGE_VALUES [[COPY]](s32), 
[[DEF]](s32)
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nhaehnle wrote:

Why are we legalizing this G_ANYEXT to G_MERGE_VALUES, but in 
`anyext_s1_to_s64_scc` we generate a new `G_ANYEXT`?

https://github.com/llvm/llvm-project/pull/132383
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