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Commit Graph

4 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
c89c722370 Allow overlaps between virtreg and physreg live ranges.
The RegisterCoalescer understands overlapping live ranges where one
register is defined as a copy of the other. With this change, register
allocators using LiveRegMatrix can do the same, at least for copies
between physical and virtual registers.

When a physreg is defined by a copy from a virtreg, allow those live
ranges to overlap:

  %CL<def> = COPY %vreg11:sub_8bit; GR32_ABCD:%vreg11
  %vreg13<def,tied1> = SAR32rCL %vreg13<tied0>, %CL<imp-use,kill>

We can assign %vreg11 to %ECX, overlapping the live range of %CL.

llvm-svn: 163336
2012-09-06 18:15:23 +00:00
Jakob Stoklund Olesen
b3487aa334 Remove -join-physregs from the test suite.
This option has been disabled for a while, and it is going away so I can
clean up the coalescer code.

The tests that required physreg joining to be enabled were almost all of
the form "tiny function with interference between arguments and return
value". Such functions are usually inlined in the real world.

The problem exposed by phys_subreg_coalesce-3.ll is real, but fairly
rare.

llvm-svn: 157027
2012-05-17 23:44:19 +00:00
Jakob Stoklund Olesen
8a075ce7ea Explicitly request -join-physregs for some tests that depend on it.
llvm-svn: 130855
2011-05-04 19:01:59 +00:00
Dale Johannesen
4b8f3692f4 The address of an indirect call must be in R12 on Darwin.
Make it so.  (This patch is in LowerCall_Darwin, which seems
to be used by SVR4 code as well; since that doesn't belong here,
I haven't worried about this case.)

llvm-svn: 98077
2010-03-09 20:15:42 +00:00