gistfile1.txt

Fun times with loop vectorization.

Using command:

../../flutter/buildtools/mac-x64/clang/bin/clang++ -MMD -MF clang_x64/obj/flutter/impeller/geometry/geometry.path_component.o.d -DUSE_OPENSSL=1 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -D_LIBCPP_DISABLE_AVAILABILITY=1 -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS -D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DIMPELLER_DEBUG=1 -DIMPELLER_ENABLE_CAPTURE=1 -DIMPELLER_SUPPORTS_RENDERING=1 -DIMPELLER_ENABLE_METAL=1 -DIMPELLER_ENABLE_OPENGLES=1 -DIMPELLER_ENABLE_VULKAN=1 -DFLUTTER_RUNTIME_MODE_DEBUG=1 -DFLUTTER_RUNTIME_MODE_PROFILE=2 -DFLUTTER_RUNTIME_MODE_RELEASE=3 -DFLUTTER_RUNTIME_MODE_JIT_RELEASE=4 -DDART_LEGACY_API=\[\[deprecated\]\] -DFLUTTER_RUNTIME_MODE=1 -DFLUTTER_JIT_RUNTIME=1 -I../.. -Iclang_x64/gen -I../../third_party/libcxx/include -I../../third_party/libcxxabi/include -I../../flutter/build/secondary/third_party/libcxx/config -I../../flutter -Wthread-safety-analysis -fno-strict-aliasing -fstack-protector-all --target=x86_64-apple-macos -arch x86_64 -fcolor-diagnostics -Wall -Wextra -Wendif-labels -Werror -Wno-missing-field-initializers -Wno-unused-parameter -Wno-unused-but-set-parameter -Wno-unused-but-set-variable -Wno-implicit-int-float-conversion -Wno-deprecated-copy -Wno-psabi -Wno-deprecated-literal-operator -Wno-unqualified-std-cast-call -Wno-non-c-typedef-for-linkage -Wno-range-loop-construct -Wunguarded-availability -Wno-deprecated-declarations -fvisibility=hidden -Wstring-conversion -Wnewline-eof -O2 -fno-ident -fdata-sections -ffunction-sections -g2 -Wunreachable-code -fvisibility-inlines-hidden -std=c++17 -fno-rtti -nostdinc++ -nostdinc++ -fvisibility=hidden -fno-exceptions -stdlib=libc++ -isysroot ../../flutter/prebuilts/SDKs/MacOSX14.0.sdk -mmacosx-version-min=10.14.0  -c ../../flutter/impeller/geometry/path_component.cc -o clang_x64/obj/flutter/impeller/geometry/geometry.path_component.o -Rpass-analysis=loop-vectorize 


And the article: https://llvm.org/docs/Vectorizers.html

Discovered you can't vectorize with some odd zero based conditions, and basically never with control flow, so no std::vector.