32 lines
1.2 KiB
LLVM
32 lines
1.2 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=-sse4.1 | FileCheck %s --check-prefix=NO_SSE_41
|
|
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse4.1 | FileCheck %s --check-prefix=SSE_41
|
|
|
|
; PR20472 ( http://llvm.org/bugs/show_bug.cgi?id=20472 )
|
|
; When sexting a trunc'd vector value, we can't eliminate the zext.
|
|
; If we don't have SSE4.1, use punpck.
|
|
; If we have SSE4.1, use pmovzx because it combines the load op.
|
|
; There may be a better way to do this using pshufb + pmovsx,
|
|
; but that is beyond our current codegen capabilities.
|
|
|
|
define <4 x i32> @trunc_sext(<4 x i16>* %in) {
|
|
; NO_SSE_41-LABEL: trunc_sext:
|
|
; NO_SSE_41: # %bb.0:
|
|
; NO_SSE_41-NEXT: movq {{.*#+}} xmm0 = mem[0],zero
|
|
; NO_SSE_41-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0,0,1,1,2,2,3,3]
|
|
; NO_SSE_41-NEXT: pslld $24, %xmm0
|
|
; NO_SSE_41-NEXT: psrad $24, %xmm0
|
|
; NO_SSE_41-NEXT: retq
|
|
;
|
|
; SSE_41-LABEL: trunc_sext:
|
|
; SSE_41: # %bb.0:
|
|
; SSE_41-NEXT: pmovzxwd {{.*#+}} xmm0 = mem[0],zero,mem[1],zero,mem[2],zero,mem[3],zero
|
|
; SSE_41-NEXT: pslld $24, %xmm0
|
|
; SSE_41-NEXT: psrad $24, %xmm0
|
|
; SSE_41-NEXT: retq
|
|
%load = load <4 x i16>, <4 x i16>* %in
|
|
%trunc = trunc <4 x i16> %load to <4 x i8>
|
|
%sext = sext <4 x i8> %trunc to <4 x i32>
|
|
ret <4 x i32> %sext
|
|
}
|
|
|