diff options
| -rw-r--r-- | llvm/include/llvm/CodeGen/TargetLowering.h | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h index 047683bb48f..1180503700b 100644 --- a/llvm/include/llvm/CodeGen/TargetLowering.h +++ b/llvm/include/llvm/CodeGen/TargetLowering.h @@ -2790,7 +2790,7 @@ protected: /// expected to be merged. unsigned GatherAllAliasesMaxDepth; - /// Specify maximum number of store instructions per memset call. + /// \brief Specify maximum number of store instructions per memset call. /// /// When lowering \@llvm.memset this field specifies the maximum number of /// store operations that may be substituted for the call to memset. Targets @@ -2801,12 +2801,10 @@ protected: /// with 16-bit alignment would result in four 2-byte stores and one 1-byte /// store. This only applies to setting a constant array of a constant size. unsigned MaxStoresPerMemset; - - /// Maximum number of stores operations that may be substituted for the call - /// to memset, used for functions with OptSize attribute. + /// Likewise for functions with the OptSize attribute. unsigned MaxStoresPerMemsetOptSize; - /// Specify maximum bytes of store instructions per memcpy call. + /// \brief Specify maximum number of store instructions per memcpy call. /// /// When lowering \@llvm.memcpy this field specifies the maximum number of /// store operations that may be substituted for a call to memcpy. Targets @@ -2818,8 +2816,8 @@ protected: /// and one 1-byte store. This only applies to copying a constant array of /// constant size. unsigned MaxStoresPerMemcpy; - - + /// Likewise for functions with the OptSize attribute. + unsigned MaxStoresPerMemcpyOptSize; /// \brief Specify max number of store instructions to glue in inlined memcpy. /// /// When memcpy is inlined based on MaxStoresPerMemcpy, specify maximum number @@ -2827,13 +2825,22 @@ protected: // vectorization later on. unsigned MaxGluedStoresPerMemcpy = 0; - /// Maximum number of store operations that may be substituted for a call to - /// memcpy, used for functions with OptSize attribute. - unsigned MaxStoresPerMemcpyOptSize; + /// \brief Specify maximum number of load instructions per memcmp call. + /// + /// When lowering \@llvm.memcmp this field specifies the maximum number of + /// pairs of load operations that may be substituted for a call to memcmp. + /// Targets must set this value based on the cost threshold for that target. + /// Targets should assume that the memcmp will be done using as many of the + /// largest load operations first, followed by smaller ones, if necessary, per + /// alignment restrictions. For example, loading 7 bytes on a 32-bit machine + /// with 32-bit alignment would result in one 4-byte load, a one 2-byte load + /// and one 1-byte load. This only applies to copying a constant array of + /// constant size. unsigned MaxLoadsPerMemcmp; + /// Likewise for functions with the OptSize attribute. unsigned MaxLoadsPerMemcmpOptSize; - /// Specify maximum bytes of store instructions per memmove call. + /// \brief Specify maximum number of store instructions per memmove call. /// /// When lowering \@llvm.memmove this field specifies the maximum number of /// store instructions that may be substituted for a call to memmove. Targets @@ -2844,9 +2851,7 @@ protected: /// with 8-bit alignment would result in nine 1-byte stores. This only /// applies to copying a constant array of constant size. unsigned MaxStoresPerMemmove; - - /// Maximum number of store instructions that may be substituted for a call to - /// memmove, used for functions with OptSize attribute. + /// Likewise for functions with the OptSize attribute. unsigned MaxStoresPerMemmoveOptSize; /// Tells the code generator that select is more expensive than a branch if |
