Displaying 4 results from an estimated 4 matches for "xsmaddmdp".
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xsmaddadp
2016 Mar 16
2
[VSXFMAMutate] OldFMAReg may be wrongly rewritten
...readable and not efficient yet, but it shows interesting
results:
In fma.ll @test_FMSUB2 (return dummy(A * B + C, A * B - D)):
before:
fmr 0, 1
xsmaddadp 3, 0, 2
xsmsubmdp 0, 2, 4
fmr 1, 3
fmr 2, 0
bl dummy2
after:
xsmsubadp 4, 1, 2
xsmaddmdp 1, 2, 3
fmr 2, 4
bl dummy2
In fma-assoc.ll all 9 copies are eliminated, for example (A * B + C * D +
E):
before:
xsmaddmdp 3, 4, 5
xsmaddadp 3, 1, 2
fmr 1, 3
after:
xsmaddadp 5, 3, 4
xsmaddmdp 1, 2, 5
In fma-ext.ll, the only copy is also el...
2016 Mar 23
0
[VSXFMAMutate] OldFMAReg may be wrongly rewritten
...ts:
>
> In fma.ll @test_FMSUB2 (return dummy(A * B + C, A * B - D)):
> before:
> fmr 0, 1
> xsmaddadp 3, 0, 2
> xsmsubmdp 0, 2, 4
> fmr 1, 3
> fmr 2, 0
> bl dummy2
>
> after:
> xsmsubadp 4, 1, 2
> xsmaddmdp 1, 2, 3
> fmr 2, 4
> bl dummy2
>
> In fma-assoc.ll all 9 copies are eliminated, for example (A * B + C * D +
> E):
> before:
> xsmaddmdp 3, 4, 5
> xsmaddadp 3, 1, 2
> fmr 1, 3
>
> after:
> xsmaddadp 5, 3, 4
>...
2016 Mar 05
2
[VSXFMAMutate] OldFMAReg may be wrongly rewritten
I wonder if we can do this in a separate analysis MachineFunction SSA pass.
1) SelectionDAG will generate a pseudo instruction MutatingFMA. When it's
generated it's allowed to have d = a * b + c form, where d doesn't have to
be in {a, b, c}.
2) Later, the proposed pass uses an algorithm to decide for instruction MI:
`%vreg0 = MutatingFMA %vreg1, %vreg2, %vreg3`, it should tie %vreg0
2020 Aug 25
3
[TableGen] What to do if there are overlapping instruction patterns?
I've been working on adding support for a (semi-proprietary) extension
for PowerPC called "Paired-Singles". It's a SIMD instruction set
supporting various operations on a vector of 2 32-bit floating point
numbers.
The Extension is found in the PowerPC 750CL, modified variants of it are
used in the Nintendo GameCube (Gekko), the Nintendo Wii (Broadway) and
the Nintendo Wii U