diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/back/write.rs')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/back/write.rs | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs index 9fa10e96068..b67890c0465 100644 --- a/compiler/rustc_codegen_llvm/src/back/write.rs +++ b/compiler/rustc_codegen_llvm/src/back/write.rs @@ -564,19 +564,16 @@ pub(crate) unsafe fn llvm_optimize( // FIXME(ZuseZ4): In a future update we could figure out how to only optimize individual functions getting // differentiated. + let consider_ad = cfg!(llvm_enzyme) && config.autodiff.contains(&config::AutoDiff::Enable); + let run_enzyme = autodiff_stage == AutodiffStage::DuringAD; let unroll_loops; let vectorize_slp; let vectorize_loop; - let run_enzyme = cfg!(llvm_enzyme) && autodiff_stage == AutodiffStage::DuringAD; // When we build rustc with enzyme/autodiff support, we want to postpone size-increasing // optimizations until after differentiation. Our pipeline is thus: (opt + enzyme), (full opt). // We therefore have two calls to llvm_optimize, if autodiff is used. - // - // FIXME(ZuseZ4): Before shipping on nightly, - // we should make this more granular, or at least check that the user has at least one autodiff - // call in their code, to justify altering the compilation pipeline. - if cfg!(llvm_enzyme) && autodiff_stage != AutodiffStage::PostAD { + if consider_ad && autodiff_stage != AutodiffStage::PostAD { unroll_loops = false; vectorize_slp = false; vectorize_loop = false; @@ -706,10 +703,8 @@ pub(crate) unsafe fn optimize( // If we know that we will later run AD, then we disable vectorization and loop unrolling. // Otherwise we pretend AD is already done and run the normal opt pipeline (=PostAD). - // FIXME(ZuseZ4): Make this more granular, only set PreAD if we actually have autodiff - // usages, not just if we build rustc with autodiff support. - let autodiff_stage = - if cfg!(llvm_enzyme) { AutodiffStage::PreAD } else { AutodiffStage::PostAD }; + let consider_ad = cfg!(llvm_enzyme) && config.autodiff.contains(&config::AutoDiff::Enable); + let autodiff_stage = if consider_ad { AutodiffStage::PreAD } else { AutodiffStage::PostAD }; return unsafe { llvm_optimize(cgcx, dcx, module, config, opt_level, opt_stage, autodiff_stage) }; |