en Copyright 2015 Java http://172.16.0.5:8080/history/llvm-project-15.0.7/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMatInt.cpp#407b613d [LoongArch] Add support for selecting constant materializations.Integer materializing can generate LU12I_W, ORI, LU32I_D, LU52I_D andADDI_W instructions.According to the sign-extended behavior of these instructions(except ORI), the generated instruction sequence can be improved.For example, load -1 into general register:The ADDI_W instruction performs the operation that the [31:0] bit datain the general register `rj` plus the 12-bit immediate `simm12` signextension 32-bit data; the resultant [31:0] bit is sign extension, thenwritten into the general register `rd`.Normal sequence:```lu12i.w $a0, -1ori $a0, $a0, 2048```Improved with sign-extended instruction:```addi.w $a0, $zero, -1```Reviewed By: SixWeining, MaskRayDifferential Revision: https://reviews.llvm.org/D123290 List of files: /llvm-project-15.0.7/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMatInt.cpp Fri, 15 Apr 2022 03:43:36 +0000 wanglei <wanglei@loongson.cn>