Matthew Simpson 3c3b4a257b [LV] Avoid unnecessary IV scalar-to-vector-to-scalar conversions ...

This patch prevents increases in the number of instructions, pre-instcombine,
due to induction variable scalarization. An increase in instructions can lead
to an increase in the compile-time required to simplify the induction
variables. We now maintain a new map for scalarized induction variables to
prevent us from converting between the scalar and vector forms.

This patch should resolve compile-time regressions seen after r274627.

llvm-svn: 275419

2016-07-14 14:36:06 +00:00

20 KiB

Raw Blame History

View Raw