1; RUN: llc %s -o - | FileCheck %s 2 3target triple = "thumbv7s-apple-ios" 4 5declare <8 x i8> @llvm.arm.neon.vtbl2(<8 x i8> %shuffle.i.i307, <8 x i8> %shuffle.i27.i308, <8 x i8> %vtbl2.i25.i) 6 7; Check that we get the motivating example: 8; The bitcasts force the values to go through the GPRs, whereas 9; they are defined on VPRs and used on VPRs. 10; 11; CHECK-LABEL: motivatingExample: 12; CHECK: vldr [[ARG2_VAL:d[0-9]+]], [r1] 13; CHECK-NEXT: vld1.32 {[[ARG1_VALlo:d[0-9]+]], [[ARG1_VALhi:d[0-9]+]]}, [r0] 14; CHECK-NEXT: vtbl.8 [[RES:d[0-9]+]], {[[ARG1_VALlo]], [[ARG1_VALhi]]}, [[ARG2_VAL]] 15; CHECK-NEXT: vstr [[RES]], [r1] 16; CHECK-NEXT: bx lr 17define void @motivatingExample(<2 x i64>* %addr, <8 x i8>* %addr2) { 18 %shuffle.i.bc.i309 = load <2 x i64>, <2 x i64>* %addr 19 %vtbl2.i25.i = load <8 x i8>, <8 x i8>* %addr2 20 %shuffle.i.extract.i310 = extractelement <2 x i64> %shuffle.i.bc.i309, i32 0 21 %shuffle.i27.extract.i311 = extractelement <2 x i64> %shuffle.i.bc.i309, i32 1 22 %tmp45 = bitcast i64 %shuffle.i.extract.i310 to <8 x i8> 23 %tmp46 = bitcast i64 %shuffle.i27.extract.i311 to <8 x i8> 24 %vtbl2.i25.i313 = tail call <8 x i8> @llvm.arm.neon.vtbl2(<8 x i8> %tmp45, <8 x i8> %tmp46, <8 x i8> %vtbl2.i25.i) 25 store <8 x i8> %vtbl2.i25.i313, <8 x i8>* %addr2 26 ret void 27} 28 29; Check that we do not perform the transformation for dynamic index. 30; CHECK-LABEL: dynamicIndex: 31; CHECK-NOT: mul 32; CHECK: pop 33define void @dynamicIndex(<2 x i64>* %addr, <8 x i8>* %addr2, i32 %index) { 34 %shuffle.i.bc.i309 = load <2 x i64>, <2 x i64>* %addr 35 %vtbl2.i25.i = load <8 x i8>, <8 x i8>* %addr2 36 %shuffle.i.extract.i310 = extractelement <2 x i64> %shuffle.i.bc.i309, i32 %index 37 %shuffle.i27.extract.i311 = extractelement <2 x i64> %shuffle.i.bc.i309, i32 1 38 %tmp45 = bitcast i64 %shuffle.i.extract.i310 to <8 x i8> 39 %tmp46 = bitcast i64 %shuffle.i27.extract.i311 to <8 x i8> 40 %vtbl2.i25.i313 = tail call <8 x i8> @llvm.arm.neon.vtbl2(<8 x i8> %tmp45, <8 x i8> %tmp46, <8 x i8> %vtbl2.i25.i) 41 store <8 x i8> %vtbl2.i25.i313, <8 x i8>* %addr2 42 ret void 43} 44 45; Check that we do not perform the transformation when there are several uses 46; of the result of the bitcast. 47; CHECK-LABEL: severalUses: 48; ARG1_VALlo is hard coded because we need to access the high part of d0, 49; i.e., s1, and we can't express that with filecheck. 50; CHECK: vld1.32 {[[ARG1_VALlo:d0]], [[ARG1_VALhi:d[0-9]+]]}, [r0] 51; CHECK-NEXT: vldr [[ARG2_VAL:d[0-9]+]], [r1] 52; s1 is actually 2 * ARG1_VALlo + 1, but we cannot express that with filecheck. 53; CHECK-NEXT: vmov [[REThi:r[0-9]+]], s1 54; We build the return value here. s0 is 2 * ARG1_VALlo. 55; CHECK-NEXT: vmov r0, s0 56; This copy is correct but actually useless. We should be able to clean it up. 57; CHECK-NEXT: vmov [[ARG1_VALloCPY:d[0-9]+]], r0, [[REThi]] 58; CHECK-NEXT: vtbl.8 [[RES:d[0-9]+]], {[[ARG1_VALloCPY]], [[ARG1_VALhi]]}, [[ARG2_VAL]] 59; CHECK-NEXT: vstr [[RES]], [r1] 60; CHECK-NEXT: mov r1, [[REThi]] 61; CHECK-NEXT: bx lr 62define i64 @severalUses(<2 x i64>* %addr, <8 x i8>* %addr2) { 63 %shuffle.i.bc.i309 = load <2 x i64>, <2 x i64>* %addr 64 %vtbl2.i25.i = load <8 x i8>, <8 x i8>* %addr2 65 %shuffle.i.extract.i310 = extractelement <2 x i64> %shuffle.i.bc.i309, i32 0 66 %shuffle.i27.extract.i311 = extractelement <2 x i64> %shuffle.i.bc.i309, i32 1 67 %tmp45 = bitcast i64 %shuffle.i.extract.i310 to <8 x i8> 68 %tmp46 = bitcast i64 %shuffle.i27.extract.i311 to <8 x i8> 69 %vtbl2.i25.i313 = tail call <8 x i8> @llvm.arm.neon.vtbl2(<8 x i8> %tmp45, <8 x i8> %tmp46, <8 x i8> %vtbl2.i25.i) 70 store <8 x i8> %vtbl2.i25.i313, <8 x i8>* %addr2 71 ret i64 %shuffle.i.extract.i310 72} 73