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2010 Nov 18
1
[LLVMdev] subregs in trivial coalescing
...OPY
that uses a subreg as a destination?
I've got the following sequence of code (unfortunately for an out of tree
target) that is moving 32 and 64 bit sub-registers around within a 128 bit
register. By the time the register allocator runs the code looks like:
92L %reg16402:dsub0<def> = DEF64.. %reg16402<imp-def>, QPR:%reg16402....
116L %reg16405:sub0<def> = COPY %reg16402:sub1, %reg16405<imp-def>;
QPR:%reg16405,16402
124L %reg16413:sub0<def> = COPY %reg16405:sub0<kill>; QPR:%reg16413,16405
.... stuff ....
468L %reg16460:sub3<def> = COPY %reg16402:...