llvm-project

Author SHA1 Message Date

Author	SHA1	Message	Date
David Green	7786ac8377	[ARM] Remove dead mov's in preheader of tail predicated loops With t2DoLoopDec we can be left with some extra MOV's in the preheaders of tail predicated loops. This removes them, in the same way we remove other dead variables. Differential Revision: https://reviews.llvm.org/D91857	2021-02-11 10:48:20 +00:00
David Green	e7dc083a41	[ARM] Don't handle low overhead branches in AnalyzeBranch It turns our that the BranchFolder and IfCvt does not like unanalyzable branches that fall-through. This means that removing the unconditional branches from the end of tail predicated instruction can run into asserts and verifier issues. This effectively reverts `372eb2bbb6`, but adds handling to t2DoLoopEndDec which are not branches, so can be safely skipped.	2021-01-18 17:16:07 +00:00

David Green

7786ac8377

[ARM] Remove dead mov's in preheader of tail predicated loops

With t2DoLoopDec we can be left with some extra MOV's in the preheaders
of tail predicated loops. This removes them, in the same way we remove
other dead variables.

Differential Revision: https://reviews.llvm.org/D91857

2021-02-11 10:48:20 +00:00

David Green

e7dc083a41

[ARM] Don't handle low overhead branches in AnalyzeBranch

It turns our that the BranchFolder and IfCvt does not like unanalyzable
branches that fall-through. This means that removing the unconditional
branches from the end of tail predicated instruction can run into
asserts and verifier issues.

This effectively reverts 372eb2bbb6, but
adds handling to t2DoLoopEndDec which are not branches, so can be safely
skipped.

2021-01-18 17:16:07 +00:00

2 Commits