[AArch64][SVE2] Add patterns for eor3

[TiehuZhang]

Summary

Add patterns for:
    eor x, (eor y, z) -> eor3 x, y, z

[sdesmalen]

llvm/test/CodeGen/AArch64/sve2-eor3.ll

17

The operation seems commutative, such that

%4 = xor <vscale x 16 x i8> %0, %1
%5 = xor <vscale x 16 x i> %2, %4

should give the same result. Can you add a test for this case?

[dmgreen]

llvm/test/CodeGen/AArch64/sve2-eor3.ll

5

Can you add other test sizes too. nxv2i64, nxv4i32 and nxv8i16.

[TiehuZhang]

Update the test:

1. Supplement other data types (nxv2i64, nxv4i32 and nxv8i16).
2. Add functions with different operand orders.

@sdesmalen, @dmgreen

llvm/test/CodeGen/AArch64/sve2-eor3.ll

5

Thanks,

[dmgreen]

Thanks. LGTM

llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td

def AArch64mla_m1 : PatFrags<(ops node:$pred, node:$op1, node:$op2, node:$op3),
                               (add node:$op1, (AArch64mul_p_oneuse node:$pred, node:$op2, node:$op3)),
                               // add(a, select(mask, mul(b, c), splat(0))) -> mla(a, mask, b, c)
                               (add node:$op1, (vselect node:$pred, (AArch64mul_p_oneuse (SVEAllActive), node:$op2, node:$op3), (SVEDup0)))]>;
 def AArch64mls_m1 : PatFrags<(ops node:$pred, node:$op1, node:$op2, node:$op3),
                              [(int_aarch64_sve_mls node:$pred, node:$op1, node:$op2, node:$op3),
                               (sub node:$op1, (AArch64mul_p_oneuse node:$pred, node:$op2, node:$op3)),
                               // sub(a, select(mask, mul(b, c), splat(0))) -> mls(a, mask, b, c)
                               (sub node:$op1, (vselect node:$pred, (AArch64mul_p_oneuse (SVEAllActive), node:$op2, node:$op3), (SVEDup0)))]>;
+def AArch64eor3 : PatFrags<(ops node:$op1, node:$op2, node:$op3),
+                           [(int_aarch64_sve_eor3 node:$op1, node:$op2, node:$op3),
+                            (xor node:$op1, (xor node:$op2, node:$op3))]>;
 
 class fma_patfrags<SDPatternOperator intrinsic, SDPatternOperator sdnode>
     : PatFrags<(ops node:$pred, node:$op1, node:$op2, node:$op3),
                [(intrinsic node:$pred, node:$op1, node:$op2, node:$op3),
                 (sdnode (SVEAllActive), node:$op1, (vselect node:$pred, (AArch64fmul_p_oneuse (SVEAllActive), node:$op2, node:$op3), (SVEDup0)))],
                [{
   if ((N->getOpcode() != AArch64ISD::FADD_PRED) &&
       (N->getOpcode() != AArch64ISD::FSUB_PRED))
let Predicates = [HasSVE2orSME] in {
 
   // SVE2 floating-point multiply-add long
   defm FMLALB_ZZZ_SHH : sve2_fp_mla_long<0b00, "fmlalb", int_aarch64_sve_fmlalb>;
   defm FMLALT_ZZZ_SHH : sve2_fp_mla_long<0b01, "fmlalt", int_aarch64_sve_fmlalt>;
   defm FMLSLB_ZZZ_SHH : sve2_fp_mla_long<0b10, "fmlslb", int_aarch64_sve_fmlslb>;
   defm FMLSLT_ZZZ_SHH : sve2_fp_mla_long<0b11, "fmlslt", int_aarch64_sve_fmlslt>;
 
   // SVE2 bitwise ternary operations
-  defm EOR3_ZZZZ  : sve2_int_bitwise_ternary_op<0b000, "eor3",  int_aarch64_sve_eor3>;
+  defm EOR3_ZZZZ  : sve2_int_bitwise_ternary_op<0b000, "eor3",  AArch64eor3>;
   defm BCAX_ZZZZ  : sve2_int_bitwise_ternary_op<0b010, "bcax",  int_aarch64_sve_bcax>;
   defm BSL_ZZZZ   : sve2_int_bitwise_ternary_op<0b001, "bsl",   int_aarch64_sve_bsl, AArch64bsp>;
   defm BSL1N_ZZZZ : sve2_int_bitwise_ternary_op<0b011, "bsl1n", int_aarch64_sve_bsl1n>;
   defm BSL2N_ZZZZ : sve2_int_bitwise_ternary_op<0b101, "bsl2n", int_aarch64_sve_bsl2n>;
   defm NBSL_ZZZZ  : sve2_int_bitwise_ternary_op<0b111, "nbsl",  int_aarch64_sve_nbsl>;
 
   // SVE2 bitwise xor and rotate right by immediate
   defm XAR_ZZZI : sve2_int_rotate_right_imm<"xar", int_aarch64_sve_xar>;

llvm/test/CodeGen/AArch64/sve2-eor3.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-none-eabi -mattr=+sve2 < %s -o - | FileCheck %s --check-prefix=SVE2
+; RUN: llc -mtriple=aarch64-none-eabi -mattr=+sve < %s -o - | FileCheck %s --check-prefix=SVE
+
+define <vscale x 16 x i8> @eor3(<vscale x 16 x i8> %0, <vscale x 16 x i8> %1, <vscale x 16 x i8> %2) {
+; SVE2-LABEL: eor3:
+; SVE2:       // %bb.0:
+; SVE2-NEXT:    eor3 z0.d, z0.d, z1.d, z2.d
+; SVE2-NEXT:    ret
+;
+; SVE-LABEL: eor3:
+; SVE:       // %bb.0:
+; SVE-NEXT:    eor z0.d, z0.d, z1.d
+; SVE-NEXT:    eor z0.d, z0.d, z2.d
+; SVE-NEXT:    ret
+  %4 = xor <vscale x 16 x i8> %0, %1
+  %5 = xor <vscale x 16 x i8> %4, %2
+  ret <vscale x 16 x i8> %5
+}