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From: "dag at nimrod dot no" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/53784] New: Scalar vector binary operation - error with -std=c9x/c1x
Date: Wed, 27 Jun 2012 05:40:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53784

             Bug #: 53784
           Summary: Scalar vector binary operation - error with
                    -std=c9x/c1x
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dag@nimrod.no


Test code:
----------
typedef float v8sf __attribute__ ((vector_size (4*8)));

v8sf add_scalar(v8sf v, float s)
{
  return v + s;
}
----------

If any non-GNU language standard is chosen (e.g. gcc -std=c99 -mavx -S test.c),
the compilation fails with the following error:

error: conversion of scalar to vector involves truncation

As far as I can tell, there should not be any truncation involved here.

Adding -ffast-math makes gcc accept the code.