| ; 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 |
| } |
| |