Aggressive constprop in LinearAlgebra.wrap#51582
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dkarrasch
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Very much yes!!! I forgot about that opportunity. Would be interesting to see whether this also allows to remove the branches in the BLAS-version of generic_matmatmul!.
KristofferC
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Oct 9, 2023
This helps with type-stability, as the flag `tA` is usually known from
the type of the matrix.
On master,
```julia
julia> f(A) = LinearAlgebra.wrap(A, 'N')
f (generic function with 1 method)
julia> @code_typed f([1;;])
CodeInfo(
1 ─ %1 = invoke LinearAlgebra.wrap(A::Matrix{Int64}, 'N'::Char)::Union{Adjoint{Int64, Matrix{Int64}}, Hermitian{Int64, Matrix{Int64}}, Symmetric{Int64, Matrix{Int64}}, Transpose{Int64, Matrix{Int64}}, Matrix{Int64}}
└── return %1
) => Union{Adjoint{Int64, Matrix{Int64}}, Hermitian{Int64, Matrix{Int64}}, Symmetric{Int64, Matrix{Int64}}, Transpose{Int64, Matrix{Int64}}, Matrix{Int64}}
```
This PR
```julia
julia> @code_typed f([1;;])
CodeInfo(
1 ─ return A
) => Matrix{Int64}
```
(cherry picked from commit 0fd7f72)
KristofferC
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that referenced
this pull request
Nov 2, 2023
Backported PRs: - [x] #50932 <!-- types: fix hash values of Vararg --> - [x] #50975 <!-- Use rr-safe `nopl; rdtsc` sequence --> - [x] #50989 <!-- fix incorrect results in `expm1(::Union{Float16, Float32})` --> - [x] #51284 <!-- Avoid infinite loop when doing SIGTRAP in arm64-apple --> - [x] #51332 <!-- Add s4 field to Xoshiro --> - [x] #51397 <!-- call Pkg precompile hook in latest world --> - [x] #51405 <!-- Remove fallback that assigns a module to inlined frames. --> - [x] #51491 <!-- Throw clearer ArgumentError for strip with two string args --> - [x] #51531 <!-- fix `_tryonce_download_from_cache` (busybox.exe download error) --> - [x] #51541 <!-- Fix string index error in tab completion code --> - [x] #51530 <!-- Don't mark nonlocal symbols as hidden --> - [x] #51557 <!-- Fix last startup & shutdown precompiles --> - [x] #51512 <!-- avoid limiting Type{Any} to Type --> - [x] #51595 <!-- reset `maxprobe` on `empty!` --> - [x] #51582 <!-- Aggressive constprop in LinearAlgebra.wrap --> - [x] #51592 <!-- correctly track element pointer in heap snapshot --> - [x] #51326 <!-- complete false & true more generally as vals --> - [x] #51376 <!-- make `hash(::Xoshiro)` compatible with `==` --> - [x] #51557 <!-- Fix last startup & shutdown precompiles --> - [x] #51845 - [x] #51840 - [x] #50663 <!-- Fix Expr(:loopinfo) codegen --> - [x] #51863 <!-- LLVM 15.0.7-9 --> Contains multiple commits, manual intervention needed: - [ ] #51035 <!-- refactor GC scanning code to reflect jl_binding_t are now first class --> - [ ] #51092 <!-- inference: fix bad effects for recursion --> Non-merged PRs with backport label: - [ ] #51479 <!-- prevent code loading from lookin in the versioned environment when building Julia --> - [ ] #51414 <!-- improvements on GC scheduler shutdown --> - [ ] #51366 <!-- Handle infix operators in REPL completion --> - [ ] #50919 <!-- Code loading: do the "skipping mtime check for stdlib" check regardless of the value of `ispath(f)` --> - [ ] #50824 <!-- Add some aliasing warnings to docstrings for mutating functions in Base --> - [ ] #49805 <!-- Limit TimeType subtraction to AbstractDateTime -->
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This helps with type-stability, as the flag
tAis usually known from the type of the matrix.On master,
This PR