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* Avoid #pragma intrinsic(_mm_prefetch) on Arm64EC (and other platformsGravatar Derek Mauro2023-11-28
| | | | | | | | | without SSE) Closes #1575 PiperOrigin-RevId: 586009018 Change-Id: Icc34c1201268303dde96bfbb067506b861754b3a
* Prefer builtin to inline assembly when built with -mprfchw.Gravatar Chris Kennelly2023-10-26
| | | | | PiperOrigin-RevId: 576884571 Change-Id: I7bfe68e5aedd8563f8e6dbdb5d7cc66e9af22567
* Optimize prefetch codegen.Gravatar Dmitry Vyukov2023-10-18
| | | | | | | | | | | | | | | | | | | | | | | | Currently we use "r" constraint to pass prefetched address. This forces the compiler to actually put it into a register. As the result some uses look as: 16bfb7c: 48 01 cf add %rcx,%rdi 16bfb7f: 0f 0d 0f prefetchw (%rdi) -- 16bfccf: 48 83 c1 60 add $0x60,%rcx 16bfcd3: 0f 0d 09 prefetchw (%rcx) Use "m" constraint instead. It's more relaxed and requires to just materialize the address in some form using whatever addressing modes the target supports (e.g. x86 off(base, index, scale)). With the change the same code becomes: 16bfb7c: 0f 0d 0c 39 prefetchw (%rcx,%rdi,1) -- 16bfccf: 0f 0d 49 60 prefetchw 0x60(%rcx) PiperOrigin-RevId: 574723975 Change-Id: Id0c8645f8c702d1842685343901da321f6513156
* Always inline prefetches.Gravatar Hannah Lin2023-08-14
| | | | | PiperOrigin-RevId: 556914455 Change-Id: Ic0169e1099384eefe285e6d354e448eb5189e397
* Remove _m_prefetchw() in favor of supporting only _mm_prefetch() or ↵Gravatar Martijn Vels2023-02-14
| | | | | | | | | __builtin_prefetch() Supporting _m_prefetchw() (officially part of 3DNOW) across various compilers and platforms turns out to be difficult. This change removes the explicit _m_prefetchw call aimed at MSVC compilers given that it causes issues in clang / chromium compilations. PiperOrigin-RevId: 509632497 Change-Id: Ib1b6b2cf667cbc1af5ed6651cd9aa0294a9265b6
* `PrefetchToLocalCacheForWrite` should use `__builtin_prefetch(<addr>, 1, 3)` ↵Gravatar Abseil Team2023-02-03
| | | | | | | not `__builtin_prefetch<addr>, 1, 0)` PiperOrigin-RevId: 507015724 Change-Id: I99f44fe819c27e6dcc0bb7b36f1a37015c6f1987
* Replace absl::base_internal::Prefetch* calls with absl::Prefetch* callsGravatar Martijn Vels2023-01-27
| | | | | PiperOrigin-RevId: 505184961 Change-Id: I64482558a76abda6896bec4b2d323833b6cd7edf
* Introduce Abseil Prefetch APIGravatar Martijn Vels2023-01-26
PiperOrigin-RevId: 504941246 Change-Id: I94c1e85afd254e84948477b511d41eeb8285fdae
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