Hal Finkel 8846129f6e Update PEI's virtual-register-based scavenging to support multiple simultaneous mappings ...

The previous algorithm could not deal properly with scavenging multiple virtual
registers because it kept only one live virtual -> physical mapping (and
iterated through operands in order). Now we don't maintain a current mapping,
but rather use replaceRegWith to completely remove the virtual register as
soon as the mapping is established.

In order to allow the register scavenger to return a physical register killed
by an instruction for definition by that same instruction, we now call
RS->forward(I) prior to eliminating virtual registers defined in I. This
requires a minor update to forward to ignore virtual registers.

These new features will be tested in forthcoming commits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178058 91177308-0d34-0410-b5e6-96231b3b80d8

2013-03-26 18:56:54 +00:00

..

llvm

Update PEI's virtual-register-based scavenging to support multiple simultaneous mappings

2013-03-26 18:56:54 +00:00

llvm-c

Use LLVMBool instead of 'bool' in the C API. Based on a patch by Peter Zotov!

2013-03-10 21:58:22 +00:00