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//=- AMDGPUCombine.td - Define AMDGPU Combine Rules ----------*- tablegen -*-=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
include "llvm/Target/GlobalISel/Combine.td"
// TODO: This really belongs after legalization after scalarization.
def fmin_fmax_legacy_matchdata : GIDefMatchData<"FMinFMaxLegacyInfo">;
let Predicates = [HasFminFmaxLegacy] in
def fcmp_select_to_fmin_fmax_legacy : GICombineRule<
(defs root:$select, fmin_fmax_legacy_matchdata:$matchinfo),
(match (G_FCMP $cond, $pred, $lhs, $rhs):$fcmp,
(G_SELECT f32:$dst, $cond, $true, $false):$select,
[{ return matchFMinFMaxLegacy(*${select}, *${fcmp}, ${matchinfo}); }]),
(apply [{ applySelectFCmpToFMinFMaxLegacy(*${select}, ${matchinfo}); }])>;
def uchar_to_float : GICombineRule<
(defs root:$itofp),
(match (wip_match_opcode G_UITOFP, G_SITOFP):$itofp,
[{ return matchUCharToFloat(*${itofp}); }]),
(apply [{ applyUCharToFloat(*${itofp}); }])>;
def rcp_sqrt_to_rsq : GICombineRule<
(defs root:$rcp, build_fn_matchinfo:$matchinfo),
(match (wip_match_opcode G_INTRINSIC, G_FSQRT):$rcp,
[{ return matchRcpSqrtToRsq(*${rcp}, ${matchinfo}); }]),
(apply [{ Helper.applyBuildFn(*${rcp}, ${matchinfo}); }])>;
def fdiv_by_sqrt_to_rsq_f16 : GICombineRule<
(defs root:$root),
(match (G_FSQRT f16:$sqrt, $x, (MIFlags FmContract)),
(G_FDIV f16:$dst, $y, $sqrt, (MIFlags FmContract)):$root,
[{ return matchFDivSqrtToRsqF16(*${root}); }]),
(apply [{ applyFDivSqrtToRsqF16(*${root}, ${x}.getReg()); }])>;
def cvt_f32_ubyteN_matchdata : GIDefMatchData<"CvtF32UByteMatchInfo">;
def cvt_f32_ubyteN : GICombineRule<
(defs root:$cvt_f32_ubyteN, cvt_f32_ubyteN_matchdata:$matchinfo),
(match (wip_match_opcode G_AMDGPU_CVT_F32_UBYTE0,
G_AMDGPU_CVT_F32_UBYTE1,
G_AMDGPU_CVT_F32_UBYTE2,
G_AMDGPU_CVT_F32_UBYTE3):$cvt_f32_ubyteN,
[{ return matchCvtF32UByteN(*${cvt_f32_ubyteN}, ${matchinfo}); }]),
(apply [{ applyCvtF32UByteN(*${cvt_f32_ubyteN}, ${matchinfo}); }])>;
def clamp_i64_to_i16_matchdata : GIDefMatchData<"ClampI64ToI16MatchInfo">;
def clamp_i64_to_i16 : GICombineRule<
(defs root:$clamp_i64_to_i16, clamp_i64_to_i16_matchdata:$matchinfo),
(match (wip_match_opcode G_TRUNC):$clamp_i64_to_i16,
[{ return matchClampI64ToI16(*${clamp_i64_to_i16}, MRI, MF, ${matchinfo}); }]),
(apply [{ applyClampI64ToI16(*${clamp_i64_to_i16}, ${matchinfo}); }])>;
def med3_matchdata : GIDefMatchData<"Med3MatchInfo">;
def int_minmax_to_med3 : GICombineRule<
(defs root:$min_or_max, med3_matchdata:$matchinfo),
(match (wip_match_opcode G_SMAX,
G_SMIN,
G_UMAX,
G_UMIN):$min_or_max,
[{ return matchIntMinMaxToMed3(*${min_or_max}, ${matchinfo}); }]),
(apply [{ applyMed3(*${min_or_max}, ${matchinfo}); }])>;
def fp_minmax_to_med3 : GICombineRule<
(defs root:$min_or_max, med3_matchdata:$matchinfo),
(match (wip_match_opcode G_FMAXNUM,
G_FMINNUM,
G_FMAXNUM_IEEE,
G_FMINNUM_IEEE):$min_or_max,
[{ return matchFPMinMaxToMed3(*${min_or_max}, ${matchinfo}); }]),
(apply [{ applyMed3(*${min_or_max}, ${matchinfo}); }])>;
def fp_minmax_to_clamp : GICombineRule<
(defs root:$min_or_max, register_matchinfo:$matchinfo),
(match (wip_match_opcode G_FMAXNUM,
G_FMINNUM,
G_FMAXNUM_IEEE,
G_FMINNUM_IEEE):$min_or_max,
[{ return matchFPMinMaxToClamp(*${min_or_max}, ${matchinfo}); }]),
(apply [{ applyClamp(*${min_or_max}, ${matchinfo}); }])>;
def fmed3_intrinsic_to_clamp : GICombineRule<
(defs root:$fmed3, register_matchinfo:$matchinfo),
(match (wip_match_opcode G_AMDGPU_FMED3):$fmed3,
[{ return matchFPMed3ToClamp(*${fmed3}, ${matchinfo}); }]),
(apply [{ applyClamp(*${fmed3}, ${matchinfo}); }])>;
def remove_fcanonicalize : GICombineRule<
(defs root:$fcanonicalize, register_matchinfo:$matchinfo),
(match (wip_match_opcode G_FCANONICALIZE):$fcanonicalize,
[{ return matchRemoveFcanonicalize(*${fcanonicalize}, ${matchinfo}); }]),
(apply [{ Helper.replaceSingleDefInstWithReg(*${fcanonicalize}, ${matchinfo}); }])>;
def foldable_fneg_matchdata : GIDefMatchData<"MachineInstr *">;
def foldable_fneg : GICombineRule<
(defs root:$ffn, foldable_fneg_matchdata:$matchinfo),
(match (wip_match_opcode G_FNEG):$ffn,
[{ return Helper.matchFoldableFneg(*${ffn}, ${matchinfo}); }]),
(apply [{ Helper.applyFoldableFneg(*${ffn}, ${matchinfo}); }])>;
// Detects s_mul_u64 instructions whose higher bits are zero/sign extended.
def smulu64 : GICombineRule<
(defs root:$smul, unsigned_matchinfo:$matchinfo),
(match (wip_match_opcode G_MUL):$smul,
[{ return matchCombine_s_mul_u64(*${smul}, ${matchinfo}); }]),
(apply [{ Helper.replaceOpcodeWith(*${smul}, ${matchinfo}); }])>;
def sign_exension_in_reg_matchdata : GIDefMatchData<"std::pair<MachineInstr *, unsigned>">;
def sign_extension_in_reg : GICombineRule<
(defs root:$sign_inreg, sign_exension_in_reg_matchdata:$matchinfo),
(match (wip_match_opcode G_SEXT_INREG):$sign_inreg,
[{ return matchCombineSignExtendInReg(*${sign_inreg}, ${matchinfo}); }]),
(apply [{ applyCombineSignExtendInReg(*${sign_inreg}, ${matchinfo}); }])>;
let Predicates = [Has16BitInsts, NotHasMed3_16] in {
// For gfx8, expand f16-fmed3-as-f32 into a min/max f16 sequence. This
// saves one instruction compared to the promotion.
//
// FIXME: Should have ComplexPattern like in/out matchers
//
// FIXME: We should be able to match either G_AMDGPU_FMED3 or
// G_INTRINSIC @llvm.amdgcn.fmed3. Currently the legalizer will
// replace the intrinsic with G_AMDGPU_FMED3 since we can't write a
// pattern to match it.
def expand_promoted_fmed3 : GICombineRule<
(defs root:$fptrunc_dst),
(match (G_FPTRUNC $fptrunc_dst, $fmed3_dst):$fptrunc,
(G_AMDGPU_FMED3 $fmed3_dst, $src0, $src1, $src2),
[{ return Helper.matchExpandPromotedF16FMed3(*${fptrunc}, ${src0}.getReg(), ${src1}.getReg(), ${src2}.getReg()); }]),
(apply [{ Helper.applyExpandPromotedF16FMed3(*${fptrunc}, ${src0}.getReg(), ${src1}.getReg(), ${src2}.getReg()); }])
>;
} // End Predicates = [NotHasMed3_16]
// Combines which should only apply on SI/CI
def gfx6gfx7_combines : GICombineGroup<[fcmp_select_to_fmin_fmax_legacy]>;
// Combines which should only apply on VI
def gfx8_combines : GICombineGroup<[expand_promoted_fmed3]>;
def AMDGPUPreLegalizerCombiner: GICombiner<
"AMDGPUPreLegalizerCombinerImpl",
[all_combines, clamp_i64_to_i16, foldable_fneg]> {
let CombineAllMethodName = "tryCombineAllImpl";
}
def AMDGPUPostLegalizerCombiner: GICombiner<
"AMDGPUPostLegalizerCombinerImpl",
[all_combines, gfx6gfx7_combines, gfx8_combines,
uchar_to_float, cvt_f32_ubyteN, remove_fcanonicalize, foldable_fneg,
rcp_sqrt_to_rsq, fdiv_by_sqrt_to_rsq_f16, sign_extension_in_reg, smulu64]> {
let CombineAllMethodName = "tryCombineAllImpl";
}
def AMDGPURegBankCombiner : GICombiner<
"AMDGPURegBankCombinerImpl",
[unmerge_merge, unmerge_cst, unmerge_undef,
zext_trunc_fold, int_minmax_to_med3, ptr_add_immed_chain,
fp_minmax_to_clamp, fp_minmax_to_med3, fmed3_intrinsic_to_clamp]> {
}
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