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Re: RFC: patch to build GCC for arm with LRA




AArch32:

No more issues in libstdc++ as well (same as reasons as AArch64), and
only 3 failures in the testsuite:
- The first one is invalid as the test sans the assembler for
"ldaex\tr\[0-9\]+..." and it fails because with LRA the chosen
register is r12 and thus the instruction is "ldaex  ip,..."

Fair enough - we should just fix the test and move on.

- The two others are the same bug where LRA keeps some REG_NOTES (DEAD
and UNUSED) on a comparison pattern where reload removes then, and the
results is that the comparison is removed.  I'm currently working on
this issue.

- Thumb still doesn't bootstrap.

I would suggest in addition a transitional command-line option to switch between LRA and reload as a temporary measure so that folks can do some more experimenting for AArch32.

I don't see why such a command-line option is wrong for A64 in principle but that's something for Marcus / Richard to comment.


regards
Ramana



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