https://bugs.llvm.org/show_bug.cgi?id=43504
Bug ID: 43504
Summary: Slow matrix vector product
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
https://gitlab.com/chriscox/CppPerformanceBenchmarks/blob/master/matrix_vector_product.cpp
clang++-10 -Ofast matrix_vector_product.cpp -o mm
time ./mm 500
Total absolute time for int32_t matrix vector product: 2.63 sec (2.28 sec with
-march=haswell)
Total absolute time for float matrix vector product: 2.43 sec (2.61 sec with
-march=haswell)
Total absolute time for double matrix vector product: 1.77 sec (1.55 sec with
-march=haswell)
g++-10
Total absolute time for int32_t matrix vector product: 2.40 sec (1.68 sec with
-march=haswell)
Total absolute time for float matrix vector product: 1.75 sec (2.05 sec with
-march=haswell)
Total absolute time for double matrix vector product: 1.28 sec (1.49 sec with
-march=haswell)
icc-19
Total absolute time for int32_t matrix vector product: 2.49 sec (1.86 sec with
-march=haswell)
Total absolute time for float matrix vector product: 1.96 sec (1.86 sec with
-march=haswell)
Total absolute time for double matrix vector product: 1.29 sec (1.42 sec with
-march=haswell)
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