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Re: [PATCH, GCC] Fix unrolling check.
- From: Eric Botcazou <ebotcazou at adacore dot com>
- To: Sudakshina Das <Sudi dot Das at arm dot com>
- Cc: gcc-patches at gcc dot gnu dot org, "ook at ucw dot cz" <ook at ucw dot cz>, "bin dot cheng at linux dot alibaba dot com" <bin dot cheng at linux dot alibaba dot com>
- Date: Mon, 11 Nov 2019 15:50:18 +0100
- Subject: Re: [PATCH, GCC] Fix unrolling check.
- References: <3e964005-5e24-0f15-0c88-b833e086debf@arm.com> <4550313.99ERicYdko@polaris> <ee567611-5ae2-95ee-fe59-bca80e690990@arm.com>
> Thanks for the explanation. However, I do not understand why are we
> returning with the default value.
The regression you reported should be clear enough though: if we don't do
that, we will unroll in cases where we would not have before. Try with a
compiler that predates the pragma and compare, there should be no changes.
> What "do we always do"?
What we do in the absence of specific unrolling directives for the loop.
--
Eric Botcazou