Prerequisite
Install LLVM-VE-RV-2.2.0 from https://sx-aurora.com/repos/llvm/x86_64/llvm-ve-rv-2.2.0-2.2.0-1.x86_64.rpm
Set environment for LLVM-VE-RV
. llvmvervvars.sh
Build
make
Run
Run the test program:
./test_daxpy [<array_size>]
Print ftrace performance profile:
make ftrace
Example
[focht@aurora0 Intrinsics]$ make
/opt/nec/ve/bin/ncc -ftrace -O3 -o test_daxpy.o -c test_daxpy.c
ncc: vec( 101): test_daxpy.c, line 35: Vectorized loop.
ncc: vec( 103): test_daxpy.c, line 40: Unvectorized loop.
ncc: vec( 103): test_daxpy.c, line 43: Unvectorized loop.
clang -target ve-linux -O3 -ffast-math -mvepacked -o daxpy.o -c daxpy.c
/opt/nec/ve/bin/ncc -ftrace -O3 -o test_daxpy test_daxpy.o daxpy.o
[focht@aurora0 Intrinsics]$ ./test_daxpy
n = 4000000
[focht@aurora0 Intrinsics]$ make ftrace
/opt/nec/ve/bin/ftrace -f ftrace.out
*----------------------*
FTRACE ANALYSIS LIST
*----------------------*
Execution Date : Thu Dec 17 03:36:23 2020 CET
Total CPU Time : 0:00'00"055 (0.055 sec.)
FREQUENCY EXCLUSIVE AVER.TIME MOPS MFLOPS V.OP AVER. VECTOR L1CACHE CPU PORT VLD LLC PROC.NAME
TIME[sec]( % ) [msec] RATIO V.LEN TIME MISS CONF HIT E.%
1 0.055(100.0) 55.126 73407.3 29097.1 99.44 256.0 0.055 0.000 0.000 0.00 main
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1 0.055(100.0) 55.126 73407.3 29097.1 99.44 256.0 0.055 0.000 0.000 0.00 total
100 0.028( 51.4) 0.283 71239.1 28249.8 99.14 256.0 0.028 0.000 0.000 0.00 daxpy
100 0.026( 48.1) 0.265 75683.3 30198.3 99.75 256.0 0.026 0.000 0.000 0.00 daxpy_unr
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