* Linaro
Continued trying to understand lower-subreg and its impact on ARM
optimization. After much staring at RTL dumps and trying to minimize
test cases from large code bases I've not found an example of code where
disabling the lowering of pseudo-to-pseudo copies made the code larger
for anything other than unfortunate random knock-on effects (such as no
longer being able to use 16-bit thumb1 opcodes). I posted a message to
this effect on the gcc list, and I'll try benchmarking a patch for this
next week.
In the process of looking at lower-subreg, discovered a silly
missed-optimization bug with many DImode operations, and reported it to
GCC Bugzilla as pr53189.
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