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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-12-24 17:31:38 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-12-24 17:31:38 +0000 |
| commit | 010337c8385b919f75d98f6cb383214817c13257 (patch) | |
| tree | c23a474c8e335acf01b8411d5935bfda96db0677 /llvm/test/Integer/packed_struct_bt.ll | |
| parent | 175543ac7817e78cb7f474353ae078f396c34f84 (diff) | |
| download | bcm5719-llvm-010337c8385b919f75d98f6cb383214817c13257.tar.gz bcm5719-llvm-010337c8385b919f75d98f6cb383214817c13257.zip | |
InstCombine: Canonicalize (2^n)-1 - x into (2^n)-1 ^ x iff x is known to be smaller than 2^n.
This has the obvious advantage of being commutable and is always a win on x86 because
const - x wastes a register there. On less weird architectures this may lead to
a regression because other arithmetic doesn't fuse with it anymore. I'll address that
problem in a followup.
llvm-svn: 147254
Diffstat (limited to 'llvm/test/Integer/packed_struct_bt.ll')
0 files changed, 0 insertions, 0 deletions
