2 Commits

Author	SHA1	Message	Date
Philip Reames	2b5960028e	[RISCV] Branchless lowering for select (and (x , 0x1) == 0), y, (z ^ y) ) and select (and (x , 0x1) == 0), y, (z | y) ) ... This code is directly ported from the X86 backend which applies the same rewrite (along with several others). Planning on looking more closely at the other branchless variants from x86 to see if any are worth porting in future changes. Motivation here is the coremark crc8 routine from https://github.com/eembc/coremark/blob/main/core_util.c#L165. This patch significantly reduces the number of unpredictable branches in the workload. Differential Revision: https://reviews.llvm.org/D134881	2022-09-30 08:24:32 -07:00
Philip Reames	f49887f7fd	[RISCV] Add test coverage for upcoming select lowering optimization ... Test copied from X86 backend since I'm going to be taking the code from there too.	2022-09-28 16:04:25 -07:00