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Author SHA1 Message Date
Jakob Stoklund Olesen 4df59a9ff8 Avoid rematerializing a redef immediately after the old def. 
PR14098 contains an example where we would rematerialize a MOV8ri
immediately after the original instruction:

  %vreg7:sub_8bit<def> = MOV8ri 9; GR32_ABCD:%vreg7
  %vreg22:sub_8bit<def> = MOV8ri 9; GR32_ABCD:%vreg7

Besides being pointless, it is also wrong since the original instruction
only redefines part of the register, and the value read by the new
instruction is wrong.

The problem was the LiveRangeEdit::allUsesAvailableAt() didn't
special-case OrigIdx == UseIdx and found the wrong SSA value.

llvm-svn: 166068
 2012-10-16 22:51:58 +00:00
Jakob Stoklund Olesen 2043329e67 Revert r166046 "Switch back to the old coalescer for now to fix the 32 bit bit" 
A fix for PR14098, including the test case is in the next commit.

llvm-svn: 166067
 2012-10-16 22:51:55 +00:00
Rafael Espindola b58be2c593 Switch back to the old coalescer for now to fix the 32 bit bit 
llvm+clang+compiler-rt bootstrap.

llvm-svn: 166046
 2012-10-16 19:34:06 +00:00