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Add an empty constructor shortcut to build_vector_from_ctor

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Empty vector constructors are equivalent to zero vectors.  If we handle
that case directly, we can support it for variable-length vectors and
can hopefully make things more efficient for fixed-length vectors.

This is needed by a later C++ patch.

2019-11-18  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree.c (build_vector_from_ctor): Directly return a zero vector for
	empty constructors.

From-SVN: r278413
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Richard Sandiford 2019-11-18 15:29:53 +00:00 committed by Richard Sandiford
parent cb77875a86
commit 78930e4b48
2 changed files with 8 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2019-11-18 Richard Sandiford <richard.sandiford@arm.com>
* tree.c (build_vector_from_ctor): Directly return a zero vector for
empty constructors.
2019-11-18 Richard Sandiford <richard.sandiford@arm.com>
* cse.c (cse_insn): Delete no-op register moves too.

3
gcc/tree.c
View File

@ -1858,6 +1858,9 @@ make_vector (unsigned log2_npatterns,
tree
build_vector_from_ctor (tree type, vec<constructor_elt, va_gc> *v)
{
if (vec_safe_length (v) == 0)
return build_zero_cst (type);
unsigned HOST_WIDE_INT idx, nelts;
tree value;