| Issue |
169433
|
| Summary |
[flang] missed optimization of product intrinsic
|
| Labels |
flang
|
| Assignees |
|
| Reporter |
foxtran
|
For the following code:
```
subroutine sum_and_prod(v, n, s, p)
implicit none (type, external)
integer, intent(in) :: n
real, intent(in) :: v(n)
real, intent(out) :: s, p
s = sum(v)
p = product(v)
end subroutine sum_and_prod
```
flang produces native ASM code for summation, while for product there is a call to runtime library.
Even if length of vector is known:
```
subroutine sum_and_prod_vec3(v, s, p)
implicit none (type, external)
real, intent(in) :: v(3)
real, intent(out) :: s, p
s = sum(v)
p = product(v)
end subroutine sum_and_prod_vec3
```
ASM still have call of runtime library.
It would be nice to avoid any calls especially for short arrays.
ASM output:
https://godbolt.org/z/d3Edr9GG4
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