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3 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
320db3f805 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166068 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-16 22:51:58 +00:00
Jakob Stoklund Olesen
cdcdfd2cab 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166067 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-16 22:51:55 +00:00
Rafael Espindola
6f7cccd2e2 Switch back to the old coalescer for now to fix the 32 bit bit 
llvm+clang+compiler-rt bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166046 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-16 19:34:06 +00:00