[X86] Use "and $0" and "orl $-1" to store 0 and -1 when optimizing for minsize
64-bit, 32-bit and 16-bit move-immediate instructions are 7, 6, and 5 bytes,
respectively, whereas and/or with 8-bit immediate is only three bytes.
Since these instructions imply an additional memory read (which the CPU could
elide, but we don't think it does), restrict these patterns to minsize functions.
Differential Revision: http://reviews.llvm.org/D18374
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264440 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed