https://bugs.llvm.org/show_bug.cgi?id=44915
Bug ID: 44915
Summary: extractelement on <5 x i3> always returns zeroth
element
Product: libraries
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: l...@henning-thielemann.de
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
$ cat extract.ll
target triple = "x86_64-pc-linux-gnu"
define i32 @extract3(i15*, i32) {
_L1:
%2 = load i15, i15* %0
%3 = bitcast i15 %2 to <5 x i3>
%4 = extractelement <5 x i3> %3, i32 %1
%5 = zext i3 %4 to i32
ret i32 %5
}
$ llc-9 <extract.ll
.text
.file "<stdin>"
.globl extract3 # -- Begin function extract3
.p2align 4, 0x90
.type extract3,@function
extract3: # @extract3
.cfi_startproc
# %bb.0: # %_L1
# kill: def $esi killed $esi def $rsi
movzbl (%rdi), %eax
movd %eax, %xmm0
pinsrw $1, %eax, %xmm0
pinsrw $2, %eax, %xmm0
pinsrw $3, %eax, %xmm0
pinsrw $4, %eax, %xmm0
movdqa %xmm0, -24(%rsp)
andl $7, %esi
movzwl -24(%rsp,%rsi,2), %eax
andl $7, %eax
retq
.Lfunc_end0:
.size extract3, .Lfunc_end0-extract3
.cfi_endproc
# -- End function
.section ".note.GNU-stack","",@progbits
It seems there are some shifts and masks missing.
And if it would shift and mask it do not need to roundtrip through xmm0.
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