https://bugs.llvm.org/show_bug.cgi?id=39016
Bug ID: 39016
Summary: [DAGCombine] Missed
extractelement(bitcast(scalar_to_vector()) combine
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
define i32 @test(i64 %a0) {
%1 = insertelement <2 x i64> zeroinitializer, i64 %a0, i32 0
%2 = bitcast <2 x i64> %1 to <4 x i32>
%3 = extractelement <4 x i32> %2, i32 0
ret i32 %3
}
llc -mtriple=x86_64-unknown
test: # @test
movq %rdi, %xmm0
movd %xmm0, %eax
retq
This could be reduced to:
test: # @test
mov %edi, %eax
retq
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