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[X86] Add description comments to SandyBridge for COPY/WriteZero/WriteVecMaskedGatherWriteback cases. NFC. 

Match other models.

Use X86WriteRes for WriteVecMaskedGatherWriteback like other models as well.
This commit is contained in:
Simon Pilgrim 2022-05-07 10:42:12 +01:00
parent 2db46db54d
commit eeb44579f1
1 changed files with 9 additions and 1 deletions
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10
llvm/lib/Target/X86/X86SchedSandyBridge.td
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@ -111,9 +111,17 @@ def : WriteRes<WriteStore, [SBPort23, SBPort4]>;
def : WriteRes<WriteStoreNT, [SBPort23, SBPort4]>;
def : WriteRes<WriteLoad, [SBPort23]> { let Latency = 5; }
def : WriteRes<WriteMove, [SBPort015]>;
// Treat misc copies as a move.
def : InstRW<[WriteMove], (instrs COPY)>;
// Idioms that clear a register, like xorps %xmm0, %xmm0.
// These can often bypass execution ports completely.
def : WriteRes<WriteZero, []>;
def : WriteRes<WriteVecMaskedGatherWriteback, []> { let Latency = 5; let NumMicroOps = 0; }
// Model the effect of clobbering the read-write mask operand of the GATHER operation.
// Does not cost anything by itself, only has latency, matching that of the WriteLoad,
defm : X86WriteRes<WriteVecMaskedGatherWriteback, [], 5, [], 0>;
// Arithmetic.
defm : SBWriteResPair<WriteALU, [SBPort015], 1>;