forked from OSchip/llvm-project
c407769f5e
Transform
```
(~(a | b) & c) | ~(c | (a ^ b)) -> ~((a | b) & (c | (b ^ a)))
```
And swapped case:
```
(a | ~(b & c)) & ~(a & (b ^ c)) --> ~(a | b) | (a ^ b ^ c)
```
```
----------------------------------------
define i3 @src(i3 %a, i3 %b, i3 %c) {
%0:
%or1 = or i3 %b, %c
%not1 = xor i3 %or1, 7
%and1 = and i3 %a, %not1
%xor1 = xor i3 %b, %c
%or2 = or i3 %xor1, %a
%not2 = xor i3 %or2, 7
%or3 = or i3 %and1, %not2
ret i3 %or3
}
=>
define i3 @tgt(i3 %a, i3 %b, i3 %c) {
%0:
%obc = or i3 %b, %c
%xbc = xor i3 %b, %c
%o = or i3 %a, %xbc
%and = and i3 %obc, %o
%r = xor i3 %and, 7
ret i3 %r
}
Transformation seems to be correct!
```
```
----------------------------------------
define i4 @src(i4 %a, i4 %b, i4 %c) {
%0:
%and1 = and i4 %b, %c
%not1 = xor i4 %and1, 15
%or1 = or i4 %not1, %a
%xor1 = xor i4 %b, %c
%and2 = and i4 %xor1, %a
%not2 = xor i4 %and2, 15
%and3 = and i4 %or1, %not2
ret i4 %and3
}
=>
define i4 @tgt(i4 %a, i4 %b, i4 %c) {
%0:
%xor1 = xor i4 %b, %c
%xor2 = xor i4 %xor1, %a
%or1 = or i4 %a, %b
%not1 = xor i4 %or1, 15
%or2 = or i4 %xor2, %not1
ret i4 %or2
}
Transformation seems to be correct!
```
Differential Revision: https://reviews.llvm.org/D112955
|
||
|---|---|---|
| .. | ||
| CMakeLists.txt | ||
| InstCombineAddSub.cpp | ||
| InstCombineAndOrXor.cpp | ||
| InstCombineAtomicRMW.cpp | ||
| InstCombineCalls.cpp | ||
| InstCombineCasts.cpp | ||
| InstCombineCompares.cpp | ||
| InstCombineInternal.h | ||
| InstCombineLoadStoreAlloca.cpp | ||
| InstCombineMulDivRem.cpp | ||
| InstCombineNegator.cpp | ||
| InstCombinePHI.cpp | ||
| InstCombineSelect.cpp | ||
| InstCombineShifts.cpp | ||
| InstCombineSimplifyDemanded.cpp | ||
| InstCombineVectorOps.cpp | ||
| InstructionCombining.cpp | ||