https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70928
Bug ID: 70928
Summary: Load simple float constants via VSX operations on
PowerPC
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Target Milestone: ---
With Power8 (and to a lesser extent Power7), we can create simple integer
values in VSX registers without doing a load in a few instructions (for example
-16..15 can be loaded with VSPLTIWS and VUPKHSW). If the code wants to use
these simple constants as floating point values, it is probably cheaper to load
the constants as integers and convert them to floating point, rather than
loading the constant from memory.
