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2 Commits

Author SHA1 Message Date
Chad Rosier
f1de1adc82 [AArch64] When combining constant mul of -3, prefer (sub x, (shl x, N)). 
This change only effects codegen when the constant is -3.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231085 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-03 17:31:01 +00:00
Chad Rosier
e7dfa85e85 [AArch64] Convert mul x, -(pow2 +/- 1) to shift + add/sub. 
The combine for mul x, pow2 +/- 1 is unchanged. Test cases for
both combines as well as mul x, pow2 have been added as well.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212044 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-06-30 14:51:14 +00:00