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module Pragma | ||
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export @unroll | ||
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## | ||
# Uses the loopinfo expr node to attach LLVM loopinfo to loops | ||
# the full list of supported metadata nodes is available at | ||
# https://llvm.org/docs/LangRef.html#llvm-loop | ||
# TODO: | ||
# - Figure out how to deal with compile-time constants in `@unroll(N, expr)` | ||
# so constants that come from `Val{N}` but are not parse time constant. | ||
# - Difference between `unroll_enable` and `unroll_full` | ||
# - ? Expose `unroll_disable` | ||
# - ? Expose `jam_disable` | ||
## | ||
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module MD | ||
disable_nonforced() = (Symbol("llvm.loop.disable_nonforced"),) | ||
interleave(n) = (Symbol("llvm.loop.interleave.count"), convert(Int, n)) | ||
vectorize_enable(flag) = (Symbol("llvm.loop.vectorize.enable"), convert(Bool, flag)) | ||
vectorize_width(n) = (Symbol("llvm.loop.vectorize.width"), convert(Int, n)) | ||
# ‘llvm.loop.vectorize.followup_vectorized’ | ||
# ‘llvm.loop.vectorize.followup_epilogue’ | ||
# ‘llvm.loop.vectorize.followup_all’ | ||
unroll_count(n) = (Symbol("llvm.loop.unroll.count"), convert(Int, n)) | ||
unroll_disable() = (Symbol("llvm.loop.unroll.disable"),) | ||
unroll_enable() = (Symbol("llvm.loop.unroll.enable"),) | ||
unroll_full() = (Symbol("llvm.loop.unroll.full"),) | ||
# ‘llvm.loop.unroll.followup’ | ||
# ‘llvm.loop.unroll.followup_remainder’ | ||
jam_count(n) = (Symbol("llvm.loop.unroll_and_jam.count"), convert(Int, n)) | ||
jam_disable() = (Symbol("llvm.loop.unroll_and_jam.disable"),) | ||
jam_enable() = (Symbol("llvm.loop.unroll_and_jam.enable"),) | ||
# ‘llvm.loop.unroll_and_jam.followup_outer’ | ||
# ‘llvm.loop.unroll_and_jam.followup_inner’ | ||
# ‘llvm.loop.unroll_and_jam.followup_remainder_outer’ | ||
# ‘llvm.loop.unroll_and_jam.followup_remainder_inner’ | ||
# ‘llvm.loop.unroll_and_jam.followup_all’ | ||
# ‘llvm.loop.licm_versioning.disable’ | ||
# ‘llvm.loop.distribute.enable’ | ||
# ‘llvm.loop.distribute.followup_coincident’ | ||
# ‘llvm.loop.distribute.followup_sequential’ | ||
# ‘llvm.loop.distribute.followup_fallback’ | ||
# ‘llvm.loop.distribute.followup_all’ | ||
end | ||
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function loopinfo(name, expr, nodes...) | ||
if expr.head != :for | ||
error("Syntax error: pragma $name needs a for loop") | ||
end | ||
push!(expr.args[2].args, Expr(:loopinfo, nodes...)) | ||
return expr | ||
end | ||
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""" | ||
@unroll expr | ||
Takes a for loop as `expr` and informs the LLVM unroller to fully unroll it, if | ||
it is safe to do so and the loop count is known. | ||
""" | ||
macro unroll(expr) | ||
expr = loopinfo("@unroll", expr, MD.unroll_full()) | ||
return esc(expr) | ||
end | ||
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""" | ||
@unroll N expr | ||
Takes a for loop as `expr` and informs the LLVM unroller to unroll it `N` times, | ||
if it is safe to do so. | ||
""" | ||
macro unroll(N, expr) | ||
if !(N isa Integer) | ||
error("Syntax error: `@unroll N expr` needs a constant integer N") | ||
end | ||
expr = loopinfo("@unroll", expr, MD.unroll_count(N)) | ||
return esc(expr) | ||
end | ||
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macro jam(N, expr) | ||
if !(N isa Integer) | ||
error("Syntax error: `@jam N expr` needs a constant integer N") | ||
end | ||
expr = loopinfo("@jam", expr, MD.jam_count(N)) | ||
return esc(expr) | ||
end | ||
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macro jam(expr) | ||
expr = loopinfo("@jam", expr, MD.jam_enable()) | ||
return esc(expr) | ||
end | ||
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end #module |