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4 Commits

Author SHA1 Message Date
Michael Liao da22b30be5 Fix PR15355 
- Clear 'mayStore' flag when loading from the atomic variable before the
  spin loop
- Clear kill flag from one use to multiple use in registers forming the
  address to that atomic variable
- don't use a physical register as live-in register in BB (neither entry
  nor landing pad.) by copying it into virtual register

(patch by Cameron Zwarich)

llvm-svn: 176538
 2013-03-06 00:17:04 +00:00
Eli Friedman 02f2f89a98 Fix atomic load and store on x86 to pass -verify-machineinstrs (and possibly fix some subtle bugs involving passes which check mayStore()). 
This isn't exactly ideal, but it is good enough for the moment.

llvm-svn: 139245
 2011-09-07 18:48:32 +00:00
Eli Friedman f3dd6da7a8 Don't fast-isel for atomic load/store; some cases require extra handling missing from fast-isel. 
llvm-svn: 139044
 2011-09-02 22:33:24 +00:00
Eli Friedman 5aabaaa367 Basic tests for atomic load and store on x86. 
llvm-svn: 138486
 2011-08-24 21:16:59 +00:00