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[X86] Redefine KUNPCK instructions to take a narrower source register class than destination register class. Remove copies from the isel output pattern.

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There's no reason for the inputs to be the destination register class. This just
forces an unnecessary copy in the output patterns.

llvm-svn: 358362
This commit is contained in:
Craig Topper 2019-04-14 20:52:42 +00:00
parent 37fe36ab5e
commit 8335a271a1
1 changed files with 9 additions and 11 deletions
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20
lib/Target/X86/X86InstrAVX512.td
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@ -2988,26 +2988,24 @@ defm : avx512_binop_pat<vxnor, xnor, KXNORWrr>;
defm : avx512_binop_pat<xor, xor, KXORWrr>;
// Mask unpacking
multiclass avx512_mask_unpck<string Suffix,RegisterClass KRC, ValueType VT,
RegisterClass KRCSrc, X86FoldableSchedWrite sched,
multiclass avx512_mask_unpck<string Suffix, X86KVectorVTInfo Dst,
X86KVectorVTInfo Src, X86FoldableSchedWrite sched,
Predicate prd> {
let Predicates = [prd] in {
let hasSideEffects = 0 in
def rr : I<0x4b, MRMSrcReg, (outs KRC:$dst),
(ins KRC:$src1, KRC:$src2),
def rr : I<0x4b, MRMSrcReg, (outs Dst.KRC:$dst),
(ins Src.KRC:$src1, Src.KRC:$src2),
"kunpck"#Suffix#"\t{$src2, $src1, $dst|$dst, $src1, $src2}", []>,
VEX_4V, VEX_L, Sched<[sched]>;
def : Pat<(VT (concat_vectors KRCSrc:$src1, KRCSrc:$src2)),
(!cast<Instruction>(NAME##rr)
(COPY_TO_REGCLASS KRCSrc:$src2, KRC),
(COPY_TO_REGCLASS KRCSrc:$src1, KRC))>;
def : Pat<(Dst.KVT (concat_vectors Src.KRC:$src1, Src.KRC:$src2)),
(!cast<Instruction>(NAME##rr) Src.KRC:$src2, Src.KRC:$src1)>;
}
}
defm KUNPCKBW : avx512_mask_unpck<"bw", VK16, v16i1, VK8, WriteShuffle, HasAVX512>, PD;
defm KUNPCKWD : avx512_mask_unpck<"wd", VK32, v32i1, VK16, WriteShuffle, HasBWI>, PS;
defm KUNPCKDQ : avx512_mask_unpck<"dq", VK64, v64i1, VK32, WriteShuffle, HasBWI>, PS, VEX_W;
defm KUNPCKBW : avx512_mask_unpck<"bw", v16i1_info, v8i1_info, WriteShuffle, HasAVX512>, PD;
defm KUNPCKWD : avx512_mask_unpck<"wd", v32i1_info, v16i1_info, WriteShuffle, HasBWI>, PS;
defm KUNPCKDQ : avx512_mask_unpck<"dq", v64i1_info, v32i1_info, WriteShuffle, HasBWI>, PS, VEX_W;
// Mask bit testing
multiclass avx512_mask_testop<bits<8> opc, string OpcodeStr, RegisterClass KRC,