"Singh, Ravi Kumar (Ravi)" wrote on 11.04.2012
17:50:53:
> If I disable extra transformations as suggested by you my cycles
> increase to 38xx in comparison to -O2 25xx
Sorry, I misremembered the flag spelling. It should read:
-ftree-vectorize -fno-tree-loop-if-convert --param max-stores-to
-toolchain@lists.linaro.org
Subject: Re: O2 optimization with vectorize
"Singh, Ravi Kumar (Ravi)" wrote:
> None of the generated code contains the NEON instructions. Code
> generated with case 1 is taking 3000 cycles, and code generated by
> option 2 is taking 2500
"Singh, Ravi Kumar (Ravi)" wrote:
> None of the generated code contains the NEON instructions. Code
> generated with case 1 is taking 3000 cycles, and code generated by
> option 2 is taking 2500 cycles.
>
> Even if vectorization failed in case1, it should not generate more
> inefficient code than
All,
In the below code, I tried few compiler options and got following observations:
1) arm-linux-gnueabi-gcc -O2 -mcpu=cortex-a15 -mfpu=neon
-ftree-vectorizer-verbose=6 -ftree-vectorize
Compiler throws following info messages:
foo.c:16: note: not vectorized: unsupported use in stmt
