Commit Graph

8 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen 3b2966dc7d Teach the inline spiller to attempt folding a load instruction into its single
use before rematerializing the load.

This allows us to produce:

    addps	LCPI0_1(%rip), %xmm2

Instead of:

    movaps	LCPI0_1(%rip), %xmm3
    addps	%xmm3, %xmm2

Saving a register and an instruction. The standard spiller already knows how to
do this.

llvm-svn: 122133
2010-12-18 03:04:14 +00:00
Jakob Stoklund Olesen de5c4dc24b Simplify the LiveRangeEdit::canRematerializeAt() interface a bit.
llvm-svn: 118661
2010-11-10 01:05:12 +00:00
Jakob Stoklund Olesen ba9a4985a2 Don't assign new registers created during a split to the same stack slot, but
give them individual stack slots once the are actually spilled.

llvm-svn: 117945
2010-11-01 19:49:57 +00:00
Jakob Stoklund Olesen 0cce30fd34 Fix sign error.
llvm-svn: 117677
2010-10-29 18:21:18 +00:00
Jakob Stoklund Olesen e4f3317cda After splitting, compute connected components of all new registers, not just for
the remainder register.

Example:

bb0:
  x = 1
bb1:
  use(x)
  ...
  x = 2
  jump bb1

When x is isolated in bb1, the inner part breaks into two components, x1 and x2:

bb0:
  x0 = 1
bb1:
  x1 = x0
  use(x1)
  ...
  x2 = 2
  x0 = x2
  jump bb1

llvm-svn: 117408
2010-10-26 22:36:09 +00:00
Jakob Stoklund Olesen 2edaa2fb24 Move some of the InlineSpiller rematerialization code into LiveRangeEdit.
llvm-svn: 116951
2010-10-20 22:00:51 +00:00
Jakob Stoklund Olesen 0f3e98ce2e Move stack slot assignments into LiveRangeEdit.
All registers created during splitting or spilling are assigned to the same
stack slot as the parent register.

When splitting or rematting, we may not spill at all. In that case the stack
slot is still assigned, but it will be dead.

llvm-svn: 116546
2010-10-15 00:16:55 +00:00
Jakob Stoklund Olesen 72911e49fa Create a new LiveRangeEdit class to keep track of the new registers created when
splitting or spillling, and to help with rematerialization.

Use LiveRangeEdit in InlineSpiller and SplitKit. This will eventually make it
possible to share remat code between InlineSpiller and SplitKit.

llvm-svn: 116543
2010-10-14 23:49:52 +00:00