#8647: Reduce allocations in `integer-gmp` --------------------------------------------+------------------------------ Reporter: hvr | Owner: Type: task | Status: new Priority: normal | Milestone: 7.8.1 Component: libraries (other) | Version: 7.6.3 Resolution: | Keywords: integer- Operating System: Unknown/Multiple | gmp Type of failure: Runtime performance bug | Architecture: x86_64 Test Case: | (amd64) Blocking: | Difficulty: Unknown | Blocked By: | Related Tickets: #8638 --------------------------------------------+------------------------------ Comment (by Herbert Valerio Riedel <hvr@…>): In [changeset:"8bf9541912c30ffb740d6ab67edcadcfbe4fc80b/integer-gmp"]: {{{ #!CommitTicketReference repository="integer-gmp" revision="8bf9541912c30ffb740d6ab67edcadcfbe4fc80b" Add new `mpz_{sub,add}_ui`-based primop (re #8647) This adds `{plus,minus}IntegerInt#` which help to reduce temporary allocations in `plusInteger` and `minusInteger`. This and the previous commit introducing `timesIntegerInt#` (i.e. baeeef7af6e) result in reduced allocations for the following nofib benchmarks on Linux/amd64: Program Size Allocs Runtime Elapsed TotalMem ------------------------------------------------------------------ bernouilli +0.0% -4.2% 0.12 0.12 +0.0% kahan +0.1% -12.6% 0.17 0.17 +0.0% pidigits +0.0% -0.5% -4.7% -4.5% +0.0% power +0.0% -2.7% +3.1% +3.1% +9.1% primetest +0.0% -4.2% 0.07 0.07 +0.0% rsa +0.0% -4.1% 0.02 0.02 +0.0% scs +0.0% -2.6% -0.8% -0.7% +0.0% ------------------------------------------------------------------ Min +0.0% -12.6% -4.7% -4.5% -5.0% Max +0.1% +0.2% +3.1% +3.1% +9.1% Geometric Mean +0.1% -0.3% -0.0% +0.0% +0.1% ------------------------------------------------------------------ Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org> }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8647#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler