diff options
| author | liuhongt <hongtao.liu@intel.com> | 2022-09-20 13:22:28 +0800 |
|---|---|---|
| committer | liuhongt <hongtao.liu@intel.com> | 2022-09-21 15:47:40 +0800 |
| commit | eddbb81f1254f025d6f1b6b8e7554aa9a3830302 (patch) | |
| tree | ea3ffbd47d9f494816bfbd1d28f317216bd5f5d3 /gcc | |
| parent | 9c23fe08c1fcee524503b24e15321b20df136f6c (diff) | |
| download | gcc-eddbb81f1254f025d6f1b6b8e7554aa9a3830302.zip gcc-eddbb81f1254f025d6f1b6b8e7554aa9a3830302.tar.gz gcc-eddbb81f1254f025d6f1b6b8e7554aa9a3830302.tar.bz2 | |
Don't check can_vec_perm_const_p for nonlinear iv_init when it's constant.
When init_expr is INTEGER_CST or REAL_CST, can_vec_perm_const_p is not
necessary since there's no real vec_perm needed, but
vec_gen_perm_mask_checked will gcc_assert (can_vec_perm_const_p). So
it's better to use vec_gen_perm_mask_any in
vect_create_nonlinear_iv_init.
gcc/ChangeLog:
PR tree-optimization/106963
* tree-vect-loop.cc (vect_create_nonlinear_iv_init): Use
vec_gen_perm_mask_any instead of vec_gen_perm_mask_check.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr106963.c: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/pr106963.c | 14 | ||||
| -rw-r--r-- | gcc/tree-vect-loop.cc | 5 |
2 files changed, 18 insertions, 1 deletions
diff --git a/gcc/testsuite/gcc.target/i386/pr106963.c b/gcc/testsuite/gcc.target/i386/pr106963.c new file mode 100644 index 0000000..9f2d20e --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr106963.c @@ -0,0 +1,14 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -mavx -mno-avx2" } */ + +void +foo_neg_const (int *a) +{ + int i, b = 1; + + for (i = 0; i < 1000; i++) + { + a[i] = b; + b = -b; + } +} diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index 9c434b6..aabdc6f 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -8356,8 +8356,11 @@ vect_create_nonlinear_iv_init (gimple_seq* stmts, tree init_expr, sel[2 * i + 1] = i + nunits; } vec_perm_indices indices (sel, 2, nunits); + /* Don't use vect_gen_perm_mask_checked since can_vec_perm_const_p may + fail when vec_init is const vector. In that situation vec_perm is not + really needed. */ tree perm_mask_even - = vect_gen_perm_mask_checked (vectype, indices); + = vect_gen_perm_mask_any (vectype, indices); vec_init = gimple_build (stmts, VEC_PERM_EXPR, vectype, vec_init, vec_neg, |