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* c-typeck.c (scalar_to_vector): New function. Try scalar to
vector conversion.
(stv_conv): New enum for scalar_to_vector return type.
(build_binary_op): Adjust.
* doc/extend.texi: Description of scalar to vector expansion.
c-family/
* c-common.c (unsafe_conversion_p): New function. Check if it is
unsafe to convert an expression to the type.
(conversion_warning): Adjust, use unsafe_conversion_p.
* c-common.h (unsafe_conversion_p): New function declaration.
testsuite/
* gcc.c-torture/execute/scal-to-vec1.c: New test.
* gcc.c-torture/execute/scal-to-vec2.c: New test.
* gcc.c-torture/execute/scal-to-vec3.c: New test.
* gcc.dg/scal-to-vec1.c: New test.
* gcc.dg/scal-to-vec2.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177622 138bc75d-0d04-0410-961f-82ee72b054a4
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