tree-optimization/103948 - detect vector vec_cmp in expand_vector_condition
Commit Message
Currently, expand_vector_condition detects only vcondMN and vconduMN
named RTX patterns. Teach it to also consider vec_cmpMN and vec_cmpuMN
RTX patterns when all ones vector is returned for true and all zeros vector
is returned for false.
Patch by Richard, I tested it on the patched x86 target and wrote a
ChangeLog entry.
(No testcase, it will be added in a follow-up target-dependent patch).
2022-01-10 Richard Biener <rguenther@suse.de>
gcc/ChangeLog:
PR tree-optimization/103948
* tree-vect-generic.c (expand_vector_condition): Return true if
all ones vector is returned for true, all zeros vector for false
and the target defines corresponding vec_cmp{,u}MN named RTX pattern.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Pre-approved in the PR and pushed to master.
Uros.
@@ -1052,7 +1052,9 @@ expand_vector_condition (gimple_stmt_iterator *gsi, bitmap dce_ssa_names)
}
}
- if (expand_vec_cond_expr_p (type, TREE_TYPE (a1), code))
+ if (expand_vec_cond_expr_p (type, TREE_TYPE (a1), code)
+ || (integer_all_onesp (b) && integer_zerop (c)
+ && expand_vec_cmp_expr_p (type, TREE_TYPE (a1), code)))
{
gcc_assert (TREE_CODE (a) == SSA_NAME || TREE_CODE (a) == VECTOR_CST);
return true;