http://llvm.org/bugs/show_bug.cgi?id=21717
Bug ID: 21717
Summary: Scalarized v32i8 shuffle for AVX2
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
enkidu: ~/tmp $ cat t.ll
; ModuleID = 't.c'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.10.0"
; Function Attrs: nounwind optsize readonly ssp uwtable
define <16 x i8> @foo(<16 x i16>* byval nocapture readonly align 32) #0 {
entry:
%1 = bitcast <16 x i16>* %0 to <32 x i8>*
%x1 = load <32 x i8>* %1, align 32
%2 = shufflevector <32 x i8> %x1, <32 x i8> undef, <16 x i32> <i32 0, i32 2,
i32 4, i32 6, i32 8, i32 10, i32 12, i32 14, i32 16, i32 18, i32 20, i32 22,
i32 24, i32 26, i32 28, i32 30>
ret <16 x i8> %2
}
attributes #0 = { nounwind optsize readonly ssp uwtable
"less-precise-fpmad"="false" "no-frame-pointer-elim"="true"
"no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false"
"no-nans-fp-math"="false" "stack-protector-buffer-size"="8"
"unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.module.flags = !{!0}
!llvm.ident = !{!1}
!0 = metadata !{i32 1, metadata !"PIC Level", i32 2}
!1 = metadata !{metadata !"clang version 3.6.0 (trunk 222534) (llvm/trunk
222547)"}
For AVX2, this gets scalarized. For SSE it generates a pshufb pair. Something
is rotten in Denmark.
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