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| author | Sanjay Patel <spatel@rotateright.com> | 2020-12-21 08:48:04 -0500 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2020-12-21 08:51:43 -0500 |
| commit | 38ca7face67e8488d482b66a999d0a685806879f (patch) | |
| tree | faa2265c2cd61e730c63d77433f79980b02d4821 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | d6118759f30e343a05aab053f66e5049ea149175 (diff) | |
[InstSimplify] reduce logic with inverted add/sub ops
https://llvm.org/PR48559
This could be part of a larger ValueTracking API,
but I don't see that currently.
https://rise4fun.com/Alive/gR0
Name: and
Pre: C1 == ~C2
%sub = add i8 %x, C1
%sub1 = sub i8 C2, %x
%r = and i8 %sub, %sub1
=>
%r = 0
Name: or
Pre: C1 == ~C2
%sub = add i8 %x, C1
%sub1 = sub i8 C2, %x
%r = or i8 %sub, %sub1
=>
%r = -1
Name: xor
Pre: C1 == ~C2
%sub = add i8 %x, C1
%sub1 = sub i8 C2, %x
%r = xor i8 %sub, %sub1
=>
%r = -1
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions