================
@@ -37,13 +39,12 @@ define noundef i32 @firstbituhigh_i64(i64 noundef %a) {
entry:
; CHECK: [[O:%.*]] = OpBitcast %[[#]] %[[#]]
; CHECK: [[N:%.*]] = OpExtInst %[[#]] %[[#]] FindUMsb [[O]]
-; CHECK: [[M:%.*]] = OpVectorShuffle %[[#]] [[N]] [[N]] 0
-; CHECK: [[L:%.*]] = OpVectorShuffle %[[#]] [[N]] [[N]] 1
+; CHECK: [[M:%.*]] = OpVectorExtractDynamic %[[#]] [[N]] [[Z]]
+; CHECK: [[L:%.*]] = OpVectorExtractDynamic %[[#]] [[N]] [[X]]
----------------
spall wrote:
OpVectorShuffle requires the result type to be a vector. In the case we have a
scalar i64, that would result in a vector of length 1 which is not supported in
SPIRV. So, instead in the scalar case we do a OpVectorExtractDynamic.
https://github.com/llvm/llvm-project/pull/111082
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