http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48715
Summary: CASE_VALUES_THRESHOLD should be settable with --param
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: rtl-optimization
AssignedTo: meiss...@gcc.gnu.org
ReportedBy: meiss...@gcc.gnu.org
Host: powerpc64-linux
Target: powerpc64-linux
Build: powerpc64-linux
Created attachment 24068
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24068
Patch to use --param to set CASE_VALUES_THRESHOLD
In looking at some improvements to the powerpc, we wanted to change the default
for when a table jump is generated vs. a series of if statements. Now, we
could just add a powerpc specific TARGET_CASE_VALUES_THRESHOLD, but I tend to
think that these should be settable on all/most ports with --param.
At present, there are only two ports (avr and mn10300) that define their own
TARGET_CASE_VALUES_THRESHOLD hook. My first patch does not remove the target
hook and modify the avr/mn10300 ports to use maybe_set_param_value, but that
can be done if desired.
The patch adds two --param values, one for when the port is using the casesi
insn, and the other when it uses the more primitive tablejump insn.
