[X86] Add extra PR43971 test case mentioned in D70267

llvm/test/CodeGen/X86/extractelement-load.ll

@@ -220,3 +220,48 @@ entry:
   store float %cond, float* %a1, align 4
   ret void
 }
+
+define float @PR43971_1(<8 x float> *%a0) nounwind {
+; X32-SSE2-LABEL: PR43971_1:
+; X32-SSE2:       # %bb.0: # %entry
+; X32-SSE2-NEXT:    pushl %eax
+; X32-SSE2-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X32-SSE2-NEXT:    movaps (%eax), %xmm0
+; X32-SSE2-NEXT:    shufps {{.*#+}} xmm0 = xmm0[1,1,2,3]
+; X32-SSE2-NEXT:    xorps %xmm1, %xmm1
+; X32-SSE2-NEXT:    cmpeqss %xmm0, %xmm1
+; X32-SSE2-NEXT:    movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
+; X32-SSE2-NEXT:    andps %xmm1, %xmm2
+; X32-SSE2-NEXT:    andnps %xmm0, %xmm1
+; X32-SSE2-NEXT:    orps %xmm2, %xmm1
+; X32-SSE2-NEXT:    movss %xmm1, (%esp)
+; X32-SSE2-NEXT:    flds (%esp)
+; X32-SSE2-NEXT:    popl %eax
+; X32-SSE2-NEXT:    retl
+;
+; X64-SSSE3-LABEL: PR43971_1:
+; X64-SSSE3:       # %bb.0: # %entry
+; X64-SSSE3-NEXT:    movshdup {{.*#+}} xmm1 = mem[1,1,3,3]
+; X64-SSSE3-NEXT:    xorps %xmm0, %xmm0
+; X64-SSSE3-NEXT:    cmpeqss %xmm1, %xmm0
+; X64-SSSE3-NEXT:    movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
+; X64-SSSE3-NEXT:    andps %xmm0, %xmm2
+; X64-SSSE3-NEXT:    andnps %xmm1, %xmm0
+; X64-SSSE3-NEXT:    orps %xmm2, %xmm0
+; X64-SSSE3-NEXT:    retq
+;
+; X64-AVX-LABEL: PR43971_1:
+; X64-AVX:       # %bb.0: # %entry
+; X64-AVX-NEXT:    vmovshdup {{.*#+}} xmm0 = mem[1,1,3,3]
+; X64-AVX-NEXT:    vxorps %xmm1, %xmm1, %xmm1
+; X64-AVX-NEXT:    vcmpeqss %xmm1, %xmm0, %xmm1
+; X64-AVX-NEXT:    vmovss {{.*#+}} xmm2 = mem[0],zero,zero,zero
+; X64-AVX-NEXT:    vblendvps %xmm1, %xmm2, %xmm0, %xmm0
+; X64-AVX-NEXT:    retq
+entry:
+  %0 = load <8 x float>, <8 x float>* %a0, align 32
+  %vecext = extractelement <8 x float> %0, i32 1
+  %cmp = fcmp oeq float %vecext, 0.000000e+00
+  %cond = select i1 %cmp, float 1.000000e+00, float %vecext
+  ret float %cond
+}