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Make vectorizable_operation punt early on codes it doesn't handle

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vectorizable_operation returned false for codes that are handled by
vectorizable_shift, but only after it had already done a lot of work.
Checking earlier should be more efficient and avoid polluting the logs
with duplicate info.

Also, there was no such early-out for comparisons or COND_EXPRs.
Fixing that avoids a false scan-tree-dump hit with a later patch.

2019-11-29  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vect-stmts.c (vectorizable_operation): Punt early
	on codes that are handled elsewhere.

From-SVN: r278848
This commit is contained in:
Richard Sandiford 2019-11-29 14:47:28 +00:00 committed by Richard Sandiford
parent ce19a48227
commit 4177e933b3
2 changed files with 20 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2019-11-29 Richard Sandiford <richard.sandiford@arm.com>
* tree-vect-stmts.c (vectorizable_operation): Punt early
on codes that are handled elsewhere.
2019-11-29 Richard Sandiford <richard.sandiford@arm.com>
* doc/sourcebuild.texi (vect_bool_cmp): Document.

20
gcc/tree-vect-stmts.c
View File

@ -5944,6 +5944,21 @@ vectorizable_operation (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
orig_code = code = gimple_assign_rhs_code (stmt);
/* Shifts are handled in vectorizable_shift. */
if (code == LSHIFT_EXPR
|| code == RSHIFT_EXPR
|| code == LROTATE_EXPR
|| code == RROTATE_EXPR)
return false;
/* Comparisons are handled in vectorizable_comparison. */
if (TREE_CODE_CLASS (code) == tcc_comparison)
return false;
/* Conditions are handled in vectorizable_condition. */
if (code == COND_EXPR)
return false;
/* For pointer addition and subtraction, we should use the normal
plus and minus for the vector operation. */
if (code == POINTER_PLUS_EXPR)
@ -6068,11 +6083,6 @@ vectorizable_operation (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
gcc_assert (ncopies >= 1);
/* Shifts are handled in vectorizable_shift (). */
if (code == LSHIFT_EXPR || code == RSHIFT_EXPR || code == LROTATE_EXPR
|| code == RROTATE_EXPR)
return false;
/* Supportable by target? */
vec_mode = TYPE_MODE (vectype);