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tree-optimization/108314 - avoid BIT_NOT optimization for extract-last

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The extract-last reduction internal function expects the then and
else clause as vector and scalar and thus we cannot perform optimization
of the inversion of the condition by swapping the then/else clauses.

	PR tree-optimization/108314
	* tree-vect-stmts.cc (vectorizable_condition): Do not
	perform BIT_NOT_EXPR optimization for EXTRACT_LAST_REDUCTION.

	* gcc.dg/vect/pr108314.c: New testcase.
This commit is contained in:
Richard Biener 2023-01-10 10:42:21 +01:00
parent d3328df5f5
commit 554bb9b61e
2 changed files with 25 additions and 4 deletions
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16
gcc/testsuite/gcc.dg/vect/pr108314.c Normal file
View File

@ -0,0 +1,16 @@
/* { dg-do compile } */
/* { dg-additional-options "-march=armv9-a" { target aarch64-*-* } } */
int x, y, z;
void f(void)
{
int t = 4;
for (; x; x++)
{
if (y)
continue;
t = 0;
}
z = t;
}

13
gcc/tree-vect-stmts.cc
View File

@ -10677,7 +10677,8 @@ vectorizable_condition (vec_info *vinfo,
vect_finish_stmt_generation (vinfo, stmt_info, new_stmt, gsi);
if (bitop2 == NOP_EXPR)
vec_compare = new_temp;
else if (bitop2 == BIT_NOT_EXPR)
else if (bitop2 == BIT_NOT_EXPR
&& reduction_type != EXTRACT_LAST_REDUCTION)
{
/* Instead of doing ~x ? y : z do x ? z : y. */
vec_compare = new_temp;
@ -10686,9 +10687,13 @@ vectorizable_condition (vec_info *vinfo,
else
{
vec_compare = make_ssa_name (vec_cmp_type);
new_stmt
= gimple_build_assign (vec_compare, bitop2,
vec_cond_lhs, new_temp);
if (bitop2 == BIT_NOT_EXPR)
new_stmt
= gimple_build_assign (vec_compare, bitop2, new_temp);
else
new_stmt
= gimple_build_assign (vec_compare, bitop2,
vec_cond_lhs, new_temp);
vect_finish_stmt_generation (vinfo, stmt_info,
new_stmt, gsi);
}