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PTX: Default to 32-bit indexing of pointers. #444

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May 11, 2023
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PTX: Default to 32-bit indexing of pointers. #444

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20 changes: 15 additions & 5 deletions src/ptx.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -55,11 +55,21 @@ function llvm_machine(target::PTXCompilerTarget)
end

# the default datalayout does not match the one in the NVPTX user guide
llvm_datalayout(target::PTXCompilerTarget) = Int===Int64 ?
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"*
"-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64" :
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"*
"-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
llvm_datalayout(target::PTXCompilerTarget) =
# little endian
"e-" *
# on 32-bit systems, use 32-bit pointers.
# on 64-bit systems, use 64-bit pointers, but prefer 32-bit indexing.
# this is not what the NVPTX user guide recommends, but helps for performance.
(Int === Int64 ? "p:64:64:64:32-" : "p:32:32:32-") *
# alignment of integer types
"i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-" *
# alignment of floating point types
"f32:32:32-f64:64:64-" *
# alignment of vector types
"v16:16:16-v32:32:32-v64:64:64-v128:128:128-" *
# native integer widths
"n16:32:64"

have_fma(@nospecialize(target::PTXCompilerTarget), T::Type) = true

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