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Implement coloring::iterate_solution().

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It can happen that the currently live registers are blocking a smaller
register class completely, so the only way of solving the allocation
problem is to turn some of the live-through registers into solver
variables.

When the quick_solve attempt fails, try to free up registers in the
critical register class by turning live-through values into solver
variables.
This commit is contained in:
Jakob Stoklund Olesen
2017-09-29 14:38:30 -07:00
parent 86e22e7de5
commit 51a6901a7f
5 changed files with 181 additions and 6 deletions
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lib/cretonne/meta/isa/intel/encodings.py
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@@ -119,6 +119,7 @@ enc_i32_i64(x86.udivmodx, r.div, 0xf7, rrr=6)
enc_i32_i64(base.copy, r.umr, 0x89)
enc_i32_i64(base.regmove, r.rmov, 0x89)
enc_flt(base.regmove.b1, r.rmov, 0x89)
# Immediate instructions with sign-extended 8-bit and 32-bit immediate.
for inst, rrr in [