call @PLT Performance
j at j.nl
Wed Jan 16 14:19:27 UTC 2019
On Wednesday, 16 January 2019 at 13:03:59 UTC, SrMordred wrote:
> Compiler noob here:
> auto a = popcnt(bitset);
> auto b = bsf(bitset);
> generate this:
> call pure nothrow @nogc @safe int core.bitop.popcnt(uint)@PLT
> call pure nothrow @nogc @safe int core.bitop.bsf(uint)@PLT
> Why not generate the bsf/popcnt instruction?
> Aren't this call's slower?
Yeah this is a known issue: LDC does not cross-module inline. You
can enable that by passing the "-enable-cross-module-inlining"
It's a long standing issue, but became a little less urgent
because of LTO (`-flto=...`).
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