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[LoongArch] Simplily fix extractelement on LA32 #159564

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Merged
merged 2 commits into from
Sep 19, 2025
Merged

[LoongArch] Simplily fix extractelement on LA32 #159564

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90b2085
[LoongArch] Simplily fix extractelement on LA32
zhaoqi5 Sep 18, 2025
81d7d2e
address heiher's comment
zhaoqi5 Sep 19, 2025
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4 changes: 4 additions & 0 deletions llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2855,6 +2855,10 @@ LoongArchTargetLowering::lowerEXTRACT_VECTOR_ELT(SDValue Op,
case MVT::v16i16:
case MVT::v4i64:
case MVT::v4f64: {
// TODO: Similar optimization can be applied for la32.
if (!Subtarget.is64Bit())
return SDValue();

// Extract the high half subvector and place it to the low half of a new
// vector. It doesn't matter what the high half of the new vector is.
EVT HalfTy = VecTy.getHalfNumVectorElementsVT(*DAG.getContext());
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10 changes: 5 additions & 5 deletions llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
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Expand Up @@ -1915,21 +1915,21 @@ def : Pat<(i64 (bitconvert (f64 (vector_extract v4f64:$xj, uimm2:$imm)))),
// Vector extraction with constant index.
foreach imm = 16...31 in {
defvar Imm = !and(imm, 15);
def : Pat<(i64 (vector_extract v32i8:$xj, imm)),
def : Pat<(GRLenVT (vector_extract v32i8:$xj, imm)),
(VPICKVE2GR_B (EXTRACT_SUBREG (XVPERMI_D v32i8:$xj, 14), sub_128),
Imm)>;
}
foreach imm = 8...15 in {
defvar Imm = !and(imm, 7);
def : Pat<(i64 (vector_extract v16i16:$xj, imm)),
def : Pat<(GRLenVT (vector_extract v16i16:$xj, imm)),
(VPICKVE2GR_H (EXTRACT_SUBREG (XVPERMI_D v16i16:$xj, 14), sub_128),
Imm)>;
}
def : Pat<(i64 (vector_extract v32i8:$xj, uimm4:$imm)),
def : Pat<(GRLenVT (vector_extract v32i8:$xj, uimm4:$imm)),
(VPICKVE2GR_B (EXTRACT_SUBREG v32i8:$xj, sub_128), uimm4:$imm)>;
def : Pat<(i64 (vector_extract v16i16:$xj, uimm3:$imm)),
def : Pat<(GRLenVT (vector_extract v16i16:$xj, uimm3:$imm)),
(VPICKVE2GR_H (EXTRACT_SUBREG v16i16:$xj, sub_128), uimm3:$imm)>;
def : Pat<(i64 (vector_extract v8i32:$xj, uimm3:$imm)),
def : Pat<(GRLenVT (vector_extract v8i32:$xj, uimm3:$imm)),
(XVPICKVE2GR_W v8i32:$xj, uimm3:$imm)>;
def : Pat<(i64 (vector_extract v4i64:$xj, uimm2:$imm)),
(XVPICKVE2GR_D v4i64:$xj, uimm2:$imm)>;
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30 changes: 15 additions & 15 deletions llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
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Expand Up @@ -2080,11 +2080,11 @@ def : Pat<(i64 (bitconvert (f64 (vector_extract v2f64:$vj, uimm1:$imm)))),
(VPICKVE2GR_D v2f64:$vj, uimm1:$imm)>;

// Vector extraction with constant index.
def : Pat<(i64 (vector_extract v16i8:$vj, uimm4:$imm)),
def : Pat<(GRLenVT (vector_extract v16i8:$vj, uimm4:$imm)),
(VPICKVE2GR_B v16i8:$vj, uimm4:$imm)>;
def : Pat<(i64 (vector_extract v8i16:$vj, uimm3:$imm)),
def : Pat<(GRLenVT (vector_extract v8i16:$vj, uimm3:$imm)),
(VPICKVE2GR_H v8i16:$vj, uimm3:$imm)>;
def : Pat<(i64 (vector_extract v4i32:$vj, uimm2:$imm)),
def : Pat<(GRLenVT (vector_extract v4i32:$vj, uimm2:$imm)),
(VPICKVE2GR_W v4i32:$vj, uimm2:$imm)>;
def : Pat<(i64 (vector_extract v2i64:$vj, uimm1:$imm)),
(VPICKVE2GR_D v2i64:$vj, uimm1:$imm)>;
Expand All @@ -2094,28 +2094,28 @@ def : Pat<(f64 (vector_extract v2f64:$vj, uimm1:$imm)),
(f64 (EXTRACT_SUBREG (VREPLVEI_D v2f64:$vj, uimm1:$imm), sub_64))>;

// Vector extraction with variable index.
def : Pat<(i64 (vector_extract v16i8:$vj, i64:$rk)),
def : Pat<(GRLenVT (vector_extract v16i8:$vj, GRLenVT:$rk)),
(SRAI_W (COPY_TO_REGCLASS (f32 (EXTRACT_SUBREG (VREPLVE_B v16i8:$vj,
i64:$rk),
GRLenVT:$rk),
sub_32)),
GPR), (i64 24))>;
def : Pat<(i64 (vector_extract v8i16:$vj, i64:$rk)),
GPR), (GRLenVT 24))>;
def : Pat<(GRLenVT (vector_extract v8i16:$vj, GRLenVT:$rk)),
(SRAI_W (COPY_TO_REGCLASS (f32 (EXTRACT_SUBREG (VREPLVE_H v8i16:$vj,
i64:$rk),
GRLenVT:$rk),
sub_32)),
GPR), (i64 16))>;
def : Pat<(i64 (vector_extract v4i32:$vj, i64:$rk)),
(COPY_TO_REGCLASS (f32 (EXTRACT_SUBREG (VREPLVE_W v4i32:$vj, i64:$rk),
GPR), (GRLenVT 16))>;
def : Pat<(GRLenVT (vector_extract v4i32:$vj, GRLenVT:$rk)),
(COPY_TO_REGCLASS (f32 (EXTRACT_SUBREG (VREPLVE_W v4i32:$vj, GRLenVT:$rk),
sub_32)),
GPR)>;
def : Pat<(i64 (vector_extract v2i64:$vj, i64:$rk)),
(COPY_TO_REGCLASS (f64 (EXTRACT_SUBREG (VREPLVE_D v2i64:$vj, i64:$rk),
sub_64)),
GPR)>;
def : Pat<(f32 (vector_extract v4f32:$vj, i64:$rk)),
(f32 (EXTRACT_SUBREG (VREPLVE_W v4f32:$vj, i64:$rk), sub_32))>;
def : Pat<(f64 (vector_extract v2f64:$vj, i64:$rk)),
(f64 (EXTRACT_SUBREG (VREPLVE_D v2f64:$vj, i64:$rk), sub_64))>;
def : Pat<(f32 (vector_extract v4f32:$vj, GRLenVT:$rk)),
(f32 (EXTRACT_SUBREG (VREPLVE_W v4f32:$vj, GRLenVT:$rk), sub_32))>;
def : Pat<(f64 (vector_extract v2f64:$vj, GRLenVT:$rk)),
(f64 (EXTRACT_SUBREG (VREPLVE_D v2f64:$vj, GRLenVT:$rk), sub_64))>;

// vselect
def : Pat<(v16i8 (vselect LSX128:$vd, (v16i8 (SplatPat_uimm8 uimm8:$imm)),
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