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Re: [RFC C++ / PR51033 ] Handle __builtin_shuffle in constexpr properly in the C++ frontend.
- From: Marc Glisse <marc dot glisse at inria dot fr>
- To: Ramana Radhakrishnan <ramana dot radhakrishnan at linaro dot org>
- Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>, Patch Tracking <patches at linaro dot org>, Jason Merrill <jason at redhat dot com>
- Date: Sat, 28 Jul 2012 11:26:33 +0200 (CEST)
- Subject: Re: [RFC C++ / PR51033 ] Handle __builtin_shuffle in constexpr properly in the C++ frontend.
- References: <CACUk7=WW+PQYjq9w6OtTB+Mqm1Hpcne85zau_v8u_v=yhrYvKA@mail.gmail.com>
On Mon, 18 Jun 2012, Ramana Radhakrishnan wrote:
This patch following on from the fix for turning on __builtin_shuffle
for c++ , enables folding of vec_perm_exprs in the front-end for
constexpr and constructor style values.
Hello,
I took a look, and the example I gave in
http://gcc.gnu.org/ml/gcc-patches/2012-06/msg01066.html
although it doesn't crash the compiler anymore, still fails to compile. I
am not sure: were you just trying to remove the ICE, or actually support
this use?
#include <x86intrin.h>
int main(){
constexpr __m128d x={1.,2.};
constexpr __m128i y={1,0};
constexpr __m128d z=__builtin_shuffle(x,y);
}
$ g++ -std=gnu++11 m.cc
m.cc: In function 'int main()':
m.cc:5:23: error: '#'vec_perm_expr' not supported by dump_expr#<expression
error>' is not a constant expression
constexpr __m128d z=__builtin_shuffle(x,y);
^
--
Marc Glisse