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3 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
e1b1bbb882 XFAIL test that depends on linear scan to remove dead code. 
Filed PR11364 to track the problem.  Should the register allocator
eliminate dead code?

llvm-svn: 144471
 2011-11-12 22:39:30 +00:00
Jakob Stoklund Olesen
33f01d005c Fix ARM tests to be register allocator independent. 
llvm-svn: 128680
 2011-03-31 22:14:03 +00:00
Evan Cheng
29faaebae9 Add a peephole optimization to optimize pairs of bitcasts. e.g. 
v2 = bitcast v1
...
v3 = bitcast v2
...
   = v3
=>
v2 = bitcast v1
...
   = v1
if v1 and v3 are of in the same register class.

bitcast between i32 and fp (and others) are often not nops since they
are in different register classes. These bitcast instructions are often
left because they are in different basic blocks and cannot be
eliminated by dag combine.

rdar://9104514

llvm-svn: 127668
 2011-03-15 05:13:13 +00:00