Summary:
* Code size benchmark analysis.
* Linaro binary toolchain 2012.04 release.
Details:
1. Tuning the heuristic to assign register for copies.
* Take the CONFLICT_HARD_REGS and HARD_REG_COSTS of copies into
account when conflict_costs is NULL in
update_conflict_hard_regno_costs, which handles the following case:
a = ...
...
b = a // a can be assigned with r3 or r5 which have the same min_cost.
... // b is conflicted with r3 or the cost of r3 is very high
= b
In this case, if a is assigned with r3, b can not be assigned with
r3, so the copy "b = a" can not be optimized. When taking the
CONFLICT_HARD_REGS or HARD_REG_COSTS of b into account, we can assign
a with r5.
2. Linaro binary toolchain 2012.04 release.
* Update gdb/TOOLCHAIN_PKGVERSION/README to 2012.04.
* Test workaround localization patch to fix lp:918926.
* Local build and tests show the toolchain can find the
corresponding .mo file.
* But if the host system does not have the corresponding font
packages, it will show some mess characters.
* gdb does not have gdb.mo.
3. Investigate code size regressions in 4.7.
* Loop invariant hoisting might increase register pressure, which
leads to much more spilling.
Plans:
* Finalize Linaro binary toolchain 2012.04 release
* Investigate other code size regressions in 4.7.
Planed leaves:
* Labor Day’s holiday: April 30 and May 1.
Best regards!
-Zhenqiang
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