bcm5719-llvm - Project Ortega BCM5719 LLVM

	Commit message (Collapse)	Author	Age	Files	Lines
*	[SystemZ] Improve codegen for certain SADDO-immediate cases	Ulrich Weigand	2019-04-03	1	-6/+57
\| \| \| \| \| \| \| \| \| \| \| \|	When performing an add-with-overflow with an immediate in the range -2G ... -4G, code currently loads the immediate into a register, which generally takes two instructions. In this particular case, it is preferable to load the negated immediate into a register instead, which always only requires one instruction, and then perform a subtract. llvm-svn: 357597
*	[SystemZ] Handle SADDO et.al. and ADD/SUBCARRY	Ulrich Weigand	2018-04-30	1	-0/+214
	This provides an optimized implementation of SADDO/SSUBO/UADDO/USUBO as well as ADDCARRY/SUBCARRY on top of the new CC implementation. In particular, multi-word arithmetic now uses UADDO/ADDCARRY instead of the old ADDC/ADDE logic, which means we no longer need to use "glue" links for those instructions. This also allows making full use of the memory-based instructions like ALSI, which couldn't be recognized due to limitations in the DAG matcher previously. Also, the llvm.sadd.with.overflow et.al. intrinsincs now expand to directly using the ADD instructions and checking for a CC 3 result. llvm-svn: 331203