How to get compilation option of Intel C Compile in Runtime?

Question

I made some performance experiment. I want to enable/disable autovectorization in ICC.

I add -no-vec option but is it possible to make some debug printing like:

printf("%s", VEC_ENABLED ? "vectorized" : "not vectorized");

Are there any embedded ICC macro to do this?

UPD: VEC_ENABLED is just an example and not real macro. There is no such macro in docs.

Simple workaround for make file is:

# by default vectorization enabled
#OPTFLAGS= -DVEC_ENABLED=1
# vectorization disabled
OPTFLAGS= -no-vec -DVEC_ENABLED=0
CFLAGS=... $(OPTFLAGS)

But still look for better way.

UPD2: from Anoop Madhusoodhanan Prabha - to disable both auto and explicit vectorization it is necessary to use 2 flags: -no-vec -no-simd

Answer 1

We currently don't expose any macro which reflects the status of auto-vectorization based on the compiler options passed. One important thing to keep in mind is that -no-vec will only disable auto-vectorization. If you happen to use #pragma omp simd (OpenMP SIMD) in your program, the vectorization for those loops will still happen. To totally disable vectorization (both auto-vectorization and explicit vectorization), please use compiler options -no-vec -no-simd.