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Disabled subregister copy coalescing during MachineCSE.

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This effectively backs out r197465 but leaves some of the general
fixes in place. Not all targets are ready to handle this feature. To
enable it, some infrastructure work is needed to better handle
register class constraints.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197514 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2013-12-17 19:29:36 +00:00
parent de262fecd2
commit ff7e4b11b1
3 changed files with 17 additions and 6 deletions
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1
test/CodeGen/X86/cse-add-with-overflow.ll
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@ -1,4 +1,5 @@
; RUN: llc < %s -mtriple=x86_64-darwin -mcpu=generic | FileCheck %s
; XFAIL: *
; rdar:15661073 simple example of redundant adds
;
; MachineCSE should coalesce trivial subregister copies.