https://llvm.org/bugs/show_bug.cgi?id=27265
Bug ID: 27265
Summary: [X86] Failure to fold v8i16 extractelement 0'th
element to (v)pextrw
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Attempting to store the 0'th element of a v8i16 fails to fold the store:
define void @str0_8i16(<8 x i16> %v, i16* %p) {
%1 = extractelement <8 x i16> %v, i32 0
store i16 %1, i16* %p
ret void
}
llc -march=btver2:
str0_8i16:
vmovd %xmm0, %eax
movw %ax, (%rdi)
retq
Storing other elements works fine:
define void @str1_8i16(<8 x i16> %v, i16* %p) {
%1 = extractelement <8 x i16> %v, i32 1
store i16 %1, i16* %p
ret void
}
llc -march=btver2:
str1_8i16:
vpextrw $1, %xmm0, (%rdi)
retq
And other types (4i32 / 16i8) don't exhibit this.
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