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GlobalIsel.md

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GlobalIsel

miniGhost

> git clone https://github.com/Mantevo/miniGhost.git
> cd ref
> flang-new -D_MG_INT4 -D_MG_REAL8 -ffree-form MG_FLUX_ACCUMULATE.F -emit-llvm -S -o flux_accumulate.ll -O3
> llc -mtriple=aarch64 -global-isel -stop-after=aarch64-prelegalizer-combiner flux_accumulate.ll

flux_accumulate.s will contain MIR from Fortran code.

Clang bootstrap

> cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="AArch64" -DLLVM_USE_LINKER=lld -DLLVM_ENABLE_PROJECTS="clang" -DCLANG_BOOTSTRAP_PASSTHROUGH="LLVM_TARGETS_TO_BUILD" -DCLANG_ENABLE_BOOTSTRAP=On -DBOOTSTRAP_CMAKE_CXX_FLAGS="-march=native -Rpass-missed='gisel*' -fglobal-isel -mllvm -global-isel-abort=2" ./llvm
> ninja stage2

Clang will output remarks about failures, i.e.:

remark: unable to legalize instruction: %151:_(<4 x s64>) = G_CTPOP %149:_(<4 x s64>) [-Rpass-missed=gisel-legalize]

Tablegen import

 ./bin/llvm-tblgen -gen-global-isel -warn-on-skipped-patterns -I llvm/lib/Target/AArch64 -I include -Illvm/include -Illvm/lib/Target llvm/lib/Target/AArch64/AArch64.td -o AArch64.inc