[PATCH] D64177: GlobalISel: fewerElementsVector for G_TRUNC

[Amara Emerson via Phabricator via llvm-commits]

aemerson added inline comments.


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Comment at: test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-sext.mir:64
     ; CHECK: [[COPY:%[0-9]+]]:_(<2 x s32>) = COPY $vgpr0_vgpr1
-    ; CHECK: [[C:%[0-9]+]]:_(s16) = G_CONSTANT i16 8
-    ; CHECK: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s16>) = G_BUILD_VECTOR [[C]](s16), [[C]](s16)
-    ; CHECK: [[TRUNC:%[0-9]+]]:_(<2 x s16>) = G_TRUNC [[COPY]](<2 x s32>)
-    ; CHECK: [[SHL:%[0-9]+]]:_(<2 x s16>) = G_SHL [[TRUNC]], [[BUILD_VECTOR]](<2 x s16>)
-    ; CHECK: [[ASHR:%[0-9]+]]:_(<2 x s16>) = G_ASHR [[SHL]], [[BUILD_VECTOR]](<2 x s16>)
-    ; CHECK: $vgpr0 = COPY [[ASHR]](<2 x s16>)
+    ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[C]](s32)
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Test still worthwhile having given it's now just a scalar artifact combine?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D64177/new/

https://reviews.llvm.org/D64177