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| author | Tim Northover <tnorthover@apple.com> | 2014-03-29 08:22:29 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2014-03-29 08:22:29 +0000 |
| commit | 1db780ba2244edf46f1f6880e5730511a9d5f12d (patch) | |
| tree | a0bd7cee801e895bb8f701ea31d1f58dcbe2568a /lib/MC/MCObjectFileInfo.cpp | |
| parent | 8a272f00a0eb100a1d1527eb895ba6cf5074045a (diff) | |
| download | llvm-1db780ba2244edf46f1f6880e5730511a9d5f12d.tar.gz llvm-1db780ba2244edf46f1f6880e5730511a9d5f12d.tar.bz2 llvm-1db780ba2244edf46f1f6880e5730511a9d5f12d.tar.xz | |
CodeGenPrep: wrangle IR to exploit AArch64 tbz/tbnz inst.
Given IR like:
%bit = and %val, #imm-with-1-bit-set
%tst = icmp %bit, 0
br i1 %tst, label %true, label %false
some targets can emit just a single instruction (tbz/tbnz in the
AArch64 case). However, with ISel acting at the basic-block level, all
three instructions need to be together for this to be possible.
This adds another transformation to CodeGenPrep to expose these
opportunities, if targets opt in via the hook.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205086 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/MC/MCObjectFileInfo.cpp')
0 files changed, 0 insertions, 0 deletions